2002-03-11 21:42:35 +00:00
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/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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Implement the concept of the unmapped VMIO buffers, i.e. buffers which
do not map the b_pages pages into buffer_map KVA. The use of the
unmapped buffers eliminate the need to perform TLB shootdown for
mapping on the buffer creation and reuse, greatly reducing the amount
of IPIs for shootdown on big-SMP machines and eliminating up to 25-30%
of the system time on i/o intensive workloads.
The unmapped buffer should be explicitely requested by the GB_UNMAPPED
flag by the consumer. For unmapped buffer, no KVA reservation is
performed at all. The consumer might request unmapped buffer which
does have a KVA reserve, to manually map it without recursing into
buffer cache and blocking, with the GB_KVAALLOC flag.
When the mapped buffer is requested and unmapped buffer already
exists, the cache performs an upgrade, possibly reusing the KVA
reservation.
Unmapped buffer is translated into unmapped bio in g_vfs_strategy().
Unmapped bio carry a pointer to the vm_page_t array, offset and length
instead of the data pointer. The provider which processes the bio
should explicitely specify a readiness to accept unmapped bio,
otherwise g_down geom thread performs the transient upgrade of the bio
request by mapping the pages into the new bio_transient_map KVA
submap.
The bio_transient_map submap claims up to 10% of the buffer map, and
the total buffer_map + bio_transient_map KVA usage stays the
same. Still, it could be manually tuned by kern.bio_transient_maxcnt
tunable, in the units of the transient mappings. Eventually, the
bio_transient_map could be removed after all geom classes and drivers
can accept unmapped i/o requests.
Unmapped support can be turned off by the vfs.unmapped_buf_allowed
tunable, disabling which makes the buffer (or cluster) creation
requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped
buffers are only enabled by default on the architectures where
pmap_copy_page() was implemented and tested.
In the rework, filesystem metadata is not the subject to maxbufspace
limit anymore. Since the metadata buffers are always mapped, the
buffers still have to fit into the buffer map, which provides a
reasonable (but practically unreachable) upper bound on it. The
non-metadata buffer allocations, both mapped and unmapped, is
accounted against maxbufspace, as before. Effectively, this means that
the maxbufspace is forced on mapped and unmapped buffers separately.
The pre-patch bufspace limiting code did not worked, because
buffer_map fragmentation does not allow the limit to be reached.
By Jeff Roberson request, the getnewbuf() function was split into
smaller single-purpose functions.
Sponsored by: The FreeBSD Foundation
Discussed with: jeff (previous version)
Tested by: pho, scottl (previous version), jhb, bf
MFC after: 2 weeks
2013-03-19 14:13:12 +00:00
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* Copyright (c) 2013 The FreeBSD Foundation
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2002-03-11 21:42:35 +00:00
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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*
|
Implement the concept of the unmapped VMIO buffers, i.e. buffers which
do not map the b_pages pages into buffer_map KVA. The use of the
unmapped buffers eliminate the need to perform TLB shootdown for
mapping on the buffer creation and reuse, greatly reducing the amount
of IPIs for shootdown on big-SMP machines and eliminating up to 25-30%
of the system time on i/o intensive workloads.
The unmapped buffer should be explicitely requested by the GB_UNMAPPED
flag by the consumer. For unmapped buffer, no KVA reservation is
performed at all. The consumer might request unmapped buffer which
does have a KVA reserve, to manually map it without recursing into
buffer cache and blocking, with the GB_KVAALLOC flag.
When the mapped buffer is requested and unmapped buffer already
exists, the cache performs an upgrade, possibly reusing the KVA
reservation.
Unmapped buffer is translated into unmapped bio in g_vfs_strategy().
Unmapped bio carry a pointer to the vm_page_t array, offset and length
instead of the data pointer. The provider which processes the bio
should explicitely specify a readiness to accept unmapped bio,
otherwise g_down geom thread performs the transient upgrade of the bio
request by mapping the pages into the new bio_transient_map KVA
submap.
The bio_transient_map submap claims up to 10% of the buffer map, and
the total buffer_map + bio_transient_map KVA usage stays the
same. Still, it could be manually tuned by kern.bio_transient_maxcnt
tunable, in the units of the transient mappings. Eventually, the
bio_transient_map could be removed after all geom classes and drivers
can accept unmapped i/o requests.
Unmapped support can be turned off by the vfs.unmapped_buf_allowed
tunable, disabling which makes the buffer (or cluster) creation
requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped
buffers are only enabled by default on the architectures where
pmap_copy_page() was implemented and tested.
In the rework, filesystem metadata is not the subject to maxbufspace
limit anymore. Since the metadata buffers are always mapped, the
buffers still have to fit into the buffer map, which provides a
reasonable (but practically unreachable) upper bound on it. The
non-metadata buffer allocations, both mapped and unmapped, is
accounted against maxbufspace, as before. Effectively, this means that
the maxbufspace is forced on mapped and unmapped buffers separately.
The pre-patch bufspace limiting code did not worked, because
buffer_map fragmentation does not allow the limit to be reached.
By Jeff Roberson request, the getnewbuf() function was split into
smaller single-purpose functions.
Sponsored by: The FreeBSD Foundation
Discussed with: jeff (previous version)
Tested by: pho, scottl (previous version), jhb, bf
MFC after: 2 weeks
2013-03-19 14:13:12 +00:00
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* Portions of this software were developed by Konstantin Belousov
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* under sponsorship from the FreeBSD Foundation.
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*
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2002-03-11 21:42:35 +00:00
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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2003-06-11 06:49:16 +00:00
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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2002-03-11 21:42:35 +00:00
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/bio.h>
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2004-10-21 18:35:24 +00:00
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#include <sys/ktr.h>
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2005-09-15 19:05:37 +00:00
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#include <sys/proc.h>
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2005-08-29 11:39:24 +00:00
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#include <sys/stack.h>
|
Implement the concept of the unmapped VMIO buffers, i.e. buffers which
do not map the b_pages pages into buffer_map KVA. The use of the
unmapped buffers eliminate the need to perform TLB shootdown for
mapping on the buffer creation and reuse, greatly reducing the amount
of IPIs for shootdown on big-SMP machines and eliminating up to 25-30%
of the system time on i/o intensive workloads.
The unmapped buffer should be explicitely requested by the GB_UNMAPPED
flag by the consumer. For unmapped buffer, no KVA reservation is
performed at all. The consumer might request unmapped buffer which
does have a KVA reserve, to manually map it without recursing into
buffer cache and blocking, with the GB_KVAALLOC flag.
When the mapped buffer is requested and unmapped buffer already
exists, the cache performs an upgrade, possibly reusing the KVA
reservation.
Unmapped buffer is translated into unmapped bio in g_vfs_strategy().
Unmapped bio carry a pointer to the vm_page_t array, offset and length
instead of the data pointer. The provider which processes the bio
should explicitely specify a readiness to accept unmapped bio,
otherwise g_down geom thread performs the transient upgrade of the bio
request by mapping the pages into the new bio_transient_map KVA
submap.
The bio_transient_map submap claims up to 10% of the buffer map, and
the total buffer_map + bio_transient_map KVA usage stays the
same. Still, it could be manually tuned by kern.bio_transient_maxcnt
tunable, in the units of the transient mappings. Eventually, the
bio_transient_map could be removed after all geom classes and drivers
can accept unmapped i/o requests.
Unmapped support can be turned off by the vfs.unmapped_buf_allowed
tunable, disabling which makes the buffer (or cluster) creation
requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped
buffers are only enabled by default on the architectures where
pmap_copy_page() was implemented and tested.
In the rework, filesystem metadata is not the subject to maxbufspace
limit anymore. Since the metadata buffers are always mapped, the
buffers still have to fit into the buffer map, which provides a
reasonable (but practically unreachable) upper bound on it. The
non-metadata buffer allocations, both mapped and unmapped, is
accounted against maxbufspace, as before. Effectively, this means that
the maxbufspace is forced on mapped and unmapped buffers separately.
The pre-patch bufspace limiting code did not worked, because
buffer_map fragmentation does not allow the limit to be reached.
By Jeff Roberson request, the getnewbuf() function was split into
smaller single-purpose functions.
Sponsored by: The FreeBSD Foundation
Discussed with: jeff (previous version)
Tested by: pho, scottl (previous version), jhb, bf
MFC after: 2 weeks
2013-03-19 14:13:12 +00:00
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#include <sys/sysctl.h>
|
2013-06-28 03:51:20 +00:00
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#include <sys/vmem.h>
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2002-03-11 21:42:35 +00:00
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#include <sys/errno.h>
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#include <geom/geom.h>
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2002-03-26 22:07:38 +00:00
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#include <geom/geom_int.h>
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2003-03-18 09:42:33 +00:00
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#include <sys/devicestat.h>
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2002-03-11 21:42:35 +00:00
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|
2003-05-02 12:36:12 +00:00
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#include <vm/uma.h>
|
Implement the concept of the unmapped VMIO buffers, i.e. buffers which
do not map the b_pages pages into buffer_map KVA. The use of the
unmapped buffers eliminate the need to perform TLB shootdown for
mapping on the buffer creation and reuse, greatly reducing the amount
of IPIs for shootdown on big-SMP machines and eliminating up to 25-30%
of the system time on i/o intensive workloads.
The unmapped buffer should be explicitely requested by the GB_UNMAPPED
flag by the consumer. For unmapped buffer, no KVA reservation is
performed at all. The consumer might request unmapped buffer which
does have a KVA reserve, to manually map it without recursing into
buffer cache and blocking, with the GB_KVAALLOC flag.
When the mapped buffer is requested and unmapped buffer already
exists, the cache performs an upgrade, possibly reusing the KVA
reservation.
Unmapped buffer is translated into unmapped bio in g_vfs_strategy().
Unmapped bio carry a pointer to the vm_page_t array, offset and length
instead of the data pointer. The provider which processes the bio
should explicitely specify a readiness to accept unmapped bio,
otherwise g_down geom thread performs the transient upgrade of the bio
request by mapping the pages into the new bio_transient_map KVA
submap.
The bio_transient_map submap claims up to 10% of the buffer map, and
the total buffer_map + bio_transient_map KVA usage stays the
same. Still, it could be manually tuned by kern.bio_transient_maxcnt
tunable, in the units of the transient mappings. Eventually, the
bio_transient_map could be removed after all geom classes and drivers
can accept unmapped i/o requests.
Unmapped support can be turned off by the vfs.unmapped_buf_allowed
tunable, disabling which makes the buffer (or cluster) creation
requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped
buffers are only enabled by default on the architectures where
pmap_copy_page() was implemented and tested.
In the rework, filesystem metadata is not the subject to maxbufspace
limit anymore. Since the metadata buffers are always mapped, the
buffers still have to fit into the buffer map, which provides a
reasonable (but practically unreachable) upper bound on it. The
non-metadata buffer allocations, both mapped and unmapped, is
accounted against maxbufspace, as before. Effectively, this means that
the maxbufspace is forced on mapped and unmapped buffers separately.
The pre-patch bufspace limiting code did not worked, because
buffer_map fragmentation does not allow the limit to be reached.
By Jeff Roberson request, the getnewbuf() function was split into
smaller single-purpose functions.
Sponsored by: The FreeBSD Foundation
Discussed with: jeff (previous version)
Tested by: pho, scottl (previous version), jhb, bf
MFC after: 2 weeks
2013-03-19 14:13:12 +00:00
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_page.h>
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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_map.h>
|
2003-05-02 12:36:12 +00:00
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Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
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static int g_io_transient_map_bio(struct bio *bp);
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2002-03-11 21:42:35 +00:00
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static struct g_bioq g_bio_run_down;
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static struct g_bioq g_bio_run_up;
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2004-01-28 08:39:18 +00:00
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static struct g_bioq g_bio_run_task;
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2002-03-11 21:42:35 +00:00
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|
After the introduction of direct dispatch, the pacing code in g_down()
broke in two ways. One, the pacing variable was accessed in multiple
threads in an unsafe way. Two, since large numbers of I/O could come
down from the buf layer at one time, large numbers of allocation
failures could happen all at once, resulting in a huge pace value that
would limit I/Os to 10 IOPS for minutes (or even hours) at a
time. While a real solution to these problems requires substantial
work (to go to a no-allocation after the first model, or to have some
way to wait for more memory with some kind of reserve for pager and
swapper requests), it is relatively easy to make this simplistic
pacing less pathological.
Move to using a volatile variable with loads and stores. While this is
a little racy, losing the race is safe: either you get memory and
proceed, or you don't and queue. Second, sleep for 1ms (or one tick, whichever
is larger) instead of 100ms. This removes the artificial 10 IOPS limit
while still easing up on new I/Os during memory shortages. Remove
tying the amount of time we do this to the number of failed requests
and do it only as long as we keep failing requests.
Finally, to avoid needless recursion when memory is tight (start ->
g_io_deliver() -> g_io_request() -> start -> ... until we use 1/2 the
stack), don't do direct dispatch while pacing. This should be a rare
event (not steady state) so the performance hit here is worth the
extra safety of not starving g_down() with directly dispatched I/O.
Differential Review: https://reviews.freebsd.org/D3546
2015-09-02 17:29:30 +00:00
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/*
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* Pace is a hint that we've had some trouble recently allocating
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* bios, so we should back off trying to send I/O down the stack
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* a bit to let the problem resolve. When pacing, we also turn
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* off direct dispatch to also reduce memory pressure from I/Os
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* there, at the expxense of some added latency while the memory
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* pressures exist. See g_io_schedule_down() for more details
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* and limitations.
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*/
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static volatile u_int pace;
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|
2003-05-02 12:36:12 +00:00
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static uma_zone_t biozone;
|
2002-11-02 11:08:07 +00:00
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|
2009-06-11 09:55:26 +00:00
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/*
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* The head of the list of classifiers used in g_io_request.
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* Use g_register_classifier() and g_unregister_classifier()
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* to add/remove entries to the list.
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* Classifiers are invoked in registration order.
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*/
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static TAILQ_HEAD(g_classifier_tailq, g_classifier_hook)
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g_classifier_tailq = TAILQ_HEAD_INITIALIZER(g_classifier_tailq);
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2002-03-11 21:42:35 +00:00
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#include <machine/atomic.h>
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static void
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g_bioq_lock(struct g_bioq *bq)
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{
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mtx_lock(&bq->bio_queue_lock);
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}
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static void
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g_bioq_unlock(struct g_bioq *bq)
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{
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mtx_unlock(&bq->bio_queue_lock);
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}
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#if 0
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static void
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g_bioq_destroy(struct g_bioq *bq)
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{
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mtx_destroy(&bq->bio_queue_lock);
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}
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#endif
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static void
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g_bioq_init(struct g_bioq *bq)
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{
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TAILQ_INIT(&bq->bio_queue);
|
2002-04-04 21:03:38 +00:00
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mtx_init(&bq->bio_queue_lock, "bio queue", NULL, MTX_DEF);
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2002-03-11 21:42:35 +00:00
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}
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static struct bio *
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g_bioq_first(struct g_bioq *bq)
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{
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struct bio *bp;
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bp = TAILQ_FIRST(&bq->bio_queue);
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if (bp != NULL) {
|
2004-08-30 09:33:06 +00:00
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KASSERT((bp->bio_flags & BIO_ONQUEUE),
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("Bio not on queue bp=%p target %p", bp, bq));
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bp->bio_flags &= ~BIO_ONQUEUE;
|
2002-03-11 21:42:35 +00:00
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TAILQ_REMOVE(&bq->bio_queue, bp, bio_queue);
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bq->bio_queue_length--;
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}
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return (bp);
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}
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struct bio *
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g_new_bio(void)
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{
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struct bio *bp;
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|
|
2003-05-02 12:36:12 +00:00
|
|
|
bp = uma_zalloc(biozone, M_NOWAIT | M_ZERO);
|
2005-08-29 11:39:24 +00:00
|
|
|
#ifdef KTR
|
2007-10-26 06:55:00 +00:00
|
|
|
if ((KTR_COMPILE & KTR_GEOM) && (ktr_mask & KTR_GEOM)) {
|
2005-08-29 11:39:24 +00:00
|
|
|
struct stack st;
|
|
|
|
|
|
|
|
|
|
CTR1(KTR_GEOM, "g_new_bio(): %p", bp);
|
|
|
|
|
stack_save(&st);
|
|
|
|
|
CTRSTACK(KTR_GEOM, &st, 3, 0);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
2002-03-11 21:42:35 +00:00
|
|
|
return (bp);
|
|
|
|
|
}
|
|
|
|
|
|
2004-08-27 14:43:11 +00:00
|
|
|
struct bio *
|
|
|
|
|
g_alloc_bio(void)
|
|
|
|
|
{
|
|
|
|
|
struct bio *bp;
|
|
|
|
|
|
|
|
|
|
bp = uma_zalloc(biozone, M_WAITOK | M_ZERO);
|
2005-08-29 11:39:24 +00:00
|
|
|
#ifdef KTR
|
2007-10-26 06:55:00 +00:00
|
|
|
if ((KTR_COMPILE & KTR_GEOM) && (ktr_mask & KTR_GEOM)) {
|
2005-08-29 11:39:24 +00:00
|
|
|
struct stack st;
|
|
|
|
|
|
|
|
|
|
CTR1(KTR_GEOM, "g_alloc_bio(): %p", bp);
|
|
|
|
|
stack_save(&st);
|
|
|
|
|
CTRSTACK(KTR_GEOM, &st, 3, 0);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
2004-08-27 14:43:11 +00:00
|
|
|
return (bp);
|
|
|
|
|
}
|
|
|
|
|
|
2002-03-11 21:42:35 +00:00
|
|
|
void
|
|
|
|
|
g_destroy_bio(struct bio *bp)
|
|
|
|
|
{
|
2005-08-29 11:39:24 +00:00
|
|
|
#ifdef KTR
|
2007-10-26 06:55:00 +00:00
|
|
|
if ((KTR_COMPILE & KTR_GEOM) && (ktr_mask & KTR_GEOM)) {
|
2005-08-29 11:39:24 +00:00
|
|
|
struct stack st;
|
2002-03-11 21:42:35 +00:00
|
|
|
|
2005-08-29 11:39:24 +00:00
|
|
|
CTR1(KTR_GEOM, "g_destroy_bio(): %p", bp);
|
|
|
|
|
stack_save(&st);
|
|
|
|
|
CTRSTACK(KTR_GEOM, &st, 3, 0);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
2003-05-02 12:36:12 +00:00
|
|
|
uma_zfree(biozone, bp);
|
2002-03-11 21:42:35 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
struct bio *
|
|
|
|
|
g_clone_bio(struct bio *bp)
|
|
|
|
|
{
|
|
|
|
|
struct bio *bp2;
|
|
|
|
|
|
2003-05-02 12:36:12 +00:00
|
|
|
bp2 = uma_zalloc(biozone, M_NOWAIT | M_ZERO);
|
2002-09-27 20:53:47 +00:00
|
|
|
if (bp2 != NULL) {
|
2003-02-07 21:09:51 +00:00
|
|
|
bp2->bio_parent = bp;
|
2002-09-27 20:53:47 +00:00
|
|
|
bp2->bio_cmd = bp->bio_cmd;
|
2012-08-07 20:16:10 +00:00
|
|
|
/*
|
|
|
|
|
* BIO_ORDERED flag may be used by disk drivers to enforce
|
|
|
|
|
* ordering restrictions, so this flag needs to be cloned.
|
Add asynchronous command support to the pass(4) driver, and the new
camdd(8) utility.
CCBs may be queued to the driver via the new CAMIOQUEUE ioctl, and
completed CCBs may be retrieved via the CAMIOGET ioctl. User
processes can use poll(2) or kevent(2) to get notification when
I/O has completed.
While the existing CAMIOCOMMAND blocking ioctl interface only
supports user virtual data pointers in a CCB (generally only
one per CCB), the new CAMIOQUEUE ioctl supports user virtual and
physical address pointers, as well as user virtual and physical
scatter/gather lists. This allows user applications to have more
flexibility in their data handling operations.
Kernel memory for data transferred via the queued interface is
allocated from the zone allocator in MAXPHYS sized chunks, and user
data is copied in and out. This is likely faster than the
vmapbuf()/vunmapbuf() method used by the CAMIOCOMMAND ioctl in
configurations with many processors (there are more TLB shootdowns
caused by the mapping/unmapping operation) but may not be as fast
as running with unmapped I/O.
The new memory handling model for user requests also allows
applications to send CCBs with request sizes that are larger than
MAXPHYS. The pass(4) driver now limits queued requests to the I/O
size listed by the SIM driver in the maxio field in the Path
Inquiry (XPT_PATH_INQ) CCB.
There are some things things would be good to add:
1. Come up with a way to do unmapped I/O on multiple buffers.
Currently the unmapped I/O interface operates on a struct bio,
which includes only one address and length. It would be nice
to be able to send an unmapped scatter/gather list down to
busdma. This would allow eliminating the copy we currently do
for data.
2. Add an ioctl to list currently outstanding CCBs in the various
queues.
3. Add an ioctl to cancel a request, or use the XPT_ABORT CCB to do
that.
4. Test physical address support. Virtual pointers and scatter
gather lists have been tested, but I have not yet tested
physical addresses or scatter/gather lists.
5. Investigate multiple queue support. At the moment there is one
queue of commands per pass(4) device. If multiple processes
open the device, they will submit I/O into the same queue and
get events for the same completions. This is probably the right
model for most applications, but it is something that could be
changed later on.
Also, add a new utility, camdd(8) that uses the asynchronous pass(4)
driver interface.
This utility is intended to be a basic data transfer/copy utility,
a simple benchmark utility, and an example of how to use the
asynchronous pass(4) interface.
It can copy data to and from pass(4) devices using any target queue
depth, starting offset and blocksize for the input and ouptut devices.
It currently only supports SCSI devices, but could be easily extended
to support ATA devices.
It can also copy data to and from regular files, block devices, tape
devices, pipes, stdin, and stdout. It does not support queueing
multiple commands to any of those targets, since it uses the standard
read(2)/write(2)/writev(2)/readv(2) system calls.
The I/O is done by two threads, one for the reader and one for the
writer. The reader thread sends completed read requests to the
writer thread in strictly sequential order, even if they complete
out of order. That could be modified later on for random I/O patterns
or slightly out of order I/O.
camdd(8) uses kqueue(2)/kevent(2) to get I/O completion events from
the pass(4) driver and also to send request notifications internally.
For pass(4) devcies, camdd(8) uses a single buffer (CAM_DATA_VADDR)
per CAM CCB on the reading side, and a scatter/gather list
(CAM_DATA_SG) on the writing side. In addition to testing both
interfaces, this makes any potential reblocking of I/O easier. No
data is copied between the reader and the writer, but rather the
reader's buffers are split into multiple I/O requests or combined
into a single I/O request depending on the input and output blocksize.
For the file I/O path, camdd(8) also uses a single buffer (read(2),
write(2), pread(2) or pwrite(2)) on reads, and a scatter/gather list
(readv(2), writev(2), preadv(2), pwritev(2)) on writes.
Things that would be nice to do for camdd(8) eventually:
1. Add support for I/O pattern generation. Patterns like all
zeros, all ones, LBA-based patterns, random patterns, etc. Right
Now you can always use /dev/zero, /dev/random, etc.
2. Add support for a "sink" mode, so we do only reads with no
writes. Right now, you can use /dev/null.
3. Add support for automatic queue depth probing, so that we can
figure out the right queue depth on the input and output side
for maximum throughput. At the moment it defaults to 6.
4. Add support for SATA device passthrough I/O.
5. Add support for random LBAs and/or lengths on the input and
output sides.
6. Track average per-I/O latency and busy time. The busy time
and latency could also feed in to the automatic queue depth
determination.
sys/cam/scsi/scsi_pass.h:
Define two new ioctls, CAMIOQUEUE and CAMIOGET, that queue
and fetch asynchronous CAM CCBs respectively.
Although these ioctls do not have a declared argument, they
both take a union ccb pointer. If we declare a size here,
the ioctl code in sys/kern/sys_generic.c will malloc and free
a buffer for either the CCB or the CCB pointer (depending on
how it is declared). Since we have to keep a copy of the
CCB (which is fairly large) anyway, having the ioctl malloc
and free a CCB for each call is wasteful.
sys/cam/scsi/scsi_pass.c:
Add asynchronous CCB support.
Add two new ioctls, CAMIOQUEUE and CAMIOGET.
CAMIOQUEUE adds a CCB to the incoming queue. The CCB is
executed immediately (and moved to the active queue) if it
is an immediate CCB, but otherwise it will be executed
in passstart() when a CCB is available from the transport layer.
When CCBs are completed (because they are immediate or
passdone() if they are queued), they are put on the done
queue.
If we get the final close on the device before all pending
I/O is complete, all active I/O is moved to the abandoned
queue and we increment the peripheral reference count so
that the peripheral driver instance doesn't go away before
all pending I/O is done.
The new passcreatezone() function is called on the first
call to the CAMIOQUEUE ioctl on a given device to allocate
the UMA zones for I/O requests and S/G list buffers. This
may be good to move off to a taskqueue at some point.
The new passmemsetup() function allocates memory and
scatter/gather lists to hold the user's data, and copies
in any data that needs to be written. For virtual pointers
(CAM_DATA_VADDR), the kernel buffer is malloced from the
new pass(4) driver malloc bucket. For virtual
scatter/gather lists (CAM_DATA_SG), buffers are allocated
from a new per-pass(9) UMA zone in MAXPHYS-sized chunks.
Physical pointers are passed in unchanged. We have support
for up to 16 scatter/gather segments (for the user and
kernel S/G lists) in the default struct pass_io_req, so
requests with longer S/G lists require an extra kernel malloc.
The new passcopysglist() function copies a user scatter/gather
list to a kernel scatter/gather list. The number of elements
in each list may be different, but (obviously) the amount of data
stored has to be identical.
The new passmemdone() function copies data out for the
CAM_DATA_VADDR and CAM_DATA_SG cases.
The new passiocleanup() function restores data pointers in
user CCBs and frees memory.
Add new functions to support kqueue(2)/kevent(2):
passreadfilt() tells kevent whether or not the done
queue is empty.
passkqfilter() adds a knote to our list.
passreadfiltdetach() removes a knote from our list.
Add a new function, passpoll(), for poll(2)/select(2)
to use.
Add devstat(9) support for the queued CCB path.
sys/cam/ata/ata_da.c:
Add support for the BIO_VLIST bio type.
sys/cam/cam_ccb.h:
Add a new enumeration for the xflags field in the CCB header.
(This doesn't change the CCB header, just adds an enumeration to
use.)
sys/cam/cam_xpt.c:
Add a new function, xpt_setup_ccb_flags(), that allows specifying
CCB flags.
sys/cam/cam_xpt.h:
Add a prototype for xpt_setup_ccb_flags().
sys/cam/scsi/scsi_da.c:
Add support for BIO_VLIST.
sys/dev/md/md.c:
Add BIO_VLIST support to md(4).
sys/geom/geom_disk.c:
Add BIO_VLIST support to the GEOM disk class. Re-factor the I/O size
limiting code in g_disk_start() a bit.
sys/kern/subr_bus_dma.c:
Change _bus_dmamap_load_vlist() to take a starting offset and
length.
Add a new function, _bus_dmamap_load_pages(), that will load a list
of physical pages starting at an offset.
Update _bus_dmamap_load_bio() to allow loading BIO_VLIST bios.
Allow unmapped I/O to start at an offset.
sys/kern/subr_uio.c:
Add two new functions, physcopyin_vlist() and physcopyout_vlist().
sys/pc98/include/bus.h:
Guard kernel-only parts of the pc98 machine/bus.h header with
#ifdef _KERNEL.
This allows userland programs to include <machine/bus.h> to get the
definition of bus_addr_t and bus_size_t.
sys/sys/bio.h:
Add a new bio flag, BIO_VLIST.
sys/sys/uio.h:
Add prototypes for physcopyin_vlist() and physcopyout_vlist().
share/man/man4/pass.4:
Document the CAMIOQUEUE and CAMIOGET ioctls.
usr.sbin/Makefile:
Add camdd.
usr.sbin/camdd/Makefile:
Add a makefile for camdd(8).
usr.sbin/camdd/camdd.8:
Man page for camdd(8).
usr.sbin/camdd/camdd.c:
The new camdd(8) utility.
Sponsored by: Spectra Logic
MFC after: 1 week
2015-12-03 20:54:55 +00:00
|
|
|
* BIO_UNMAPPED and BIO_VLIST should be inherited, to properly
|
|
|
|
|
* indicate which way the buffer is passed.
|
2012-08-07 20:16:10 +00:00
|
|
|
* Other bio flags are not suitable for cloning.
|
|
|
|
|
*/
|
Add asynchronous command support to the pass(4) driver, and the new
camdd(8) utility.
CCBs may be queued to the driver via the new CAMIOQUEUE ioctl, and
completed CCBs may be retrieved via the CAMIOGET ioctl. User
processes can use poll(2) or kevent(2) to get notification when
I/O has completed.
While the existing CAMIOCOMMAND blocking ioctl interface only
supports user virtual data pointers in a CCB (generally only
one per CCB), the new CAMIOQUEUE ioctl supports user virtual and
physical address pointers, as well as user virtual and physical
scatter/gather lists. This allows user applications to have more
flexibility in their data handling operations.
Kernel memory for data transferred via the queued interface is
allocated from the zone allocator in MAXPHYS sized chunks, and user
data is copied in and out. This is likely faster than the
vmapbuf()/vunmapbuf() method used by the CAMIOCOMMAND ioctl in
configurations with many processors (there are more TLB shootdowns
caused by the mapping/unmapping operation) but may not be as fast
as running with unmapped I/O.
The new memory handling model for user requests also allows
applications to send CCBs with request sizes that are larger than
MAXPHYS. The pass(4) driver now limits queued requests to the I/O
size listed by the SIM driver in the maxio field in the Path
Inquiry (XPT_PATH_INQ) CCB.
There are some things things would be good to add:
1. Come up with a way to do unmapped I/O on multiple buffers.
Currently the unmapped I/O interface operates on a struct bio,
which includes only one address and length. It would be nice
to be able to send an unmapped scatter/gather list down to
busdma. This would allow eliminating the copy we currently do
for data.
2. Add an ioctl to list currently outstanding CCBs in the various
queues.
3. Add an ioctl to cancel a request, or use the XPT_ABORT CCB to do
that.
4. Test physical address support. Virtual pointers and scatter
gather lists have been tested, but I have not yet tested
physical addresses or scatter/gather lists.
5. Investigate multiple queue support. At the moment there is one
queue of commands per pass(4) device. If multiple processes
open the device, they will submit I/O into the same queue and
get events for the same completions. This is probably the right
model for most applications, but it is something that could be
changed later on.
Also, add a new utility, camdd(8) that uses the asynchronous pass(4)
driver interface.
This utility is intended to be a basic data transfer/copy utility,
a simple benchmark utility, and an example of how to use the
asynchronous pass(4) interface.
It can copy data to and from pass(4) devices using any target queue
depth, starting offset and blocksize for the input and ouptut devices.
It currently only supports SCSI devices, but could be easily extended
to support ATA devices.
It can also copy data to and from regular files, block devices, tape
devices, pipes, stdin, and stdout. It does not support queueing
multiple commands to any of those targets, since it uses the standard
read(2)/write(2)/writev(2)/readv(2) system calls.
The I/O is done by two threads, one for the reader and one for the
writer. The reader thread sends completed read requests to the
writer thread in strictly sequential order, even if they complete
out of order. That could be modified later on for random I/O patterns
or slightly out of order I/O.
camdd(8) uses kqueue(2)/kevent(2) to get I/O completion events from
the pass(4) driver and also to send request notifications internally.
For pass(4) devcies, camdd(8) uses a single buffer (CAM_DATA_VADDR)
per CAM CCB on the reading side, and a scatter/gather list
(CAM_DATA_SG) on the writing side. In addition to testing both
interfaces, this makes any potential reblocking of I/O easier. No
data is copied between the reader and the writer, but rather the
reader's buffers are split into multiple I/O requests or combined
into a single I/O request depending on the input and output blocksize.
For the file I/O path, camdd(8) also uses a single buffer (read(2),
write(2), pread(2) or pwrite(2)) on reads, and a scatter/gather list
(readv(2), writev(2), preadv(2), pwritev(2)) on writes.
Things that would be nice to do for camdd(8) eventually:
1. Add support for I/O pattern generation. Patterns like all
zeros, all ones, LBA-based patterns, random patterns, etc. Right
Now you can always use /dev/zero, /dev/random, etc.
2. Add support for a "sink" mode, so we do only reads with no
writes. Right now, you can use /dev/null.
3. Add support for automatic queue depth probing, so that we can
figure out the right queue depth on the input and output side
for maximum throughput. At the moment it defaults to 6.
4. Add support for SATA device passthrough I/O.
5. Add support for random LBAs and/or lengths on the input and
output sides.
6. Track average per-I/O latency and busy time. The busy time
and latency could also feed in to the automatic queue depth
determination.
sys/cam/scsi/scsi_pass.h:
Define two new ioctls, CAMIOQUEUE and CAMIOGET, that queue
and fetch asynchronous CAM CCBs respectively.
Although these ioctls do not have a declared argument, they
both take a union ccb pointer. If we declare a size here,
the ioctl code in sys/kern/sys_generic.c will malloc and free
a buffer for either the CCB or the CCB pointer (depending on
how it is declared). Since we have to keep a copy of the
CCB (which is fairly large) anyway, having the ioctl malloc
and free a CCB for each call is wasteful.
sys/cam/scsi/scsi_pass.c:
Add asynchronous CCB support.
Add two new ioctls, CAMIOQUEUE and CAMIOGET.
CAMIOQUEUE adds a CCB to the incoming queue. The CCB is
executed immediately (and moved to the active queue) if it
is an immediate CCB, but otherwise it will be executed
in passstart() when a CCB is available from the transport layer.
When CCBs are completed (because they are immediate or
passdone() if they are queued), they are put on the done
queue.
If we get the final close on the device before all pending
I/O is complete, all active I/O is moved to the abandoned
queue and we increment the peripheral reference count so
that the peripheral driver instance doesn't go away before
all pending I/O is done.
The new passcreatezone() function is called on the first
call to the CAMIOQUEUE ioctl on a given device to allocate
the UMA zones for I/O requests and S/G list buffers. This
may be good to move off to a taskqueue at some point.
The new passmemsetup() function allocates memory and
scatter/gather lists to hold the user's data, and copies
in any data that needs to be written. For virtual pointers
(CAM_DATA_VADDR), the kernel buffer is malloced from the
new pass(4) driver malloc bucket. For virtual
scatter/gather lists (CAM_DATA_SG), buffers are allocated
from a new per-pass(9) UMA zone in MAXPHYS-sized chunks.
Physical pointers are passed in unchanged. We have support
for up to 16 scatter/gather segments (for the user and
kernel S/G lists) in the default struct pass_io_req, so
requests with longer S/G lists require an extra kernel malloc.
The new passcopysglist() function copies a user scatter/gather
list to a kernel scatter/gather list. The number of elements
in each list may be different, but (obviously) the amount of data
stored has to be identical.
The new passmemdone() function copies data out for the
CAM_DATA_VADDR and CAM_DATA_SG cases.
The new passiocleanup() function restores data pointers in
user CCBs and frees memory.
Add new functions to support kqueue(2)/kevent(2):
passreadfilt() tells kevent whether or not the done
queue is empty.
passkqfilter() adds a knote to our list.
passreadfiltdetach() removes a knote from our list.
Add a new function, passpoll(), for poll(2)/select(2)
to use.
Add devstat(9) support for the queued CCB path.
sys/cam/ata/ata_da.c:
Add support for the BIO_VLIST bio type.
sys/cam/cam_ccb.h:
Add a new enumeration for the xflags field in the CCB header.
(This doesn't change the CCB header, just adds an enumeration to
use.)
sys/cam/cam_xpt.c:
Add a new function, xpt_setup_ccb_flags(), that allows specifying
CCB flags.
sys/cam/cam_xpt.h:
Add a prototype for xpt_setup_ccb_flags().
sys/cam/scsi/scsi_da.c:
Add support for BIO_VLIST.
sys/dev/md/md.c:
Add BIO_VLIST support to md(4).
sys/geom/geom_disk.c:
Add BIO_VLIST support to the GEOM disk class. Re-factor the I/O size
limiting code in g_disk_start() a bit.
sys/kern/subr_bus_dma.c:
Change _bus_dmamap_load_vlist() to take a starting offset and
length.
Add a new function, _bus_dmamap_load_pages(), that will load a list
of physical pages starting at an offset.
Update _bus_dmamap_load_bio() to allow loading BIO_VLIST bios.
Allow unmapped I/O to start at an offset.
sys/kern/subr_uio.c:
Add two new functions, physcopyin_vlist() and physcopyout_vlist().
sys/pc98/include/bus.h:
Guard kernel-only parts of the pc98 machine/bus.h header with
#ifdef _KERNEL.
This allows userland programs to include <machine/bus.h> to get the
definition of bus_addr_t and bus_size_t.
sys/sys/bio.h:
Add a new bio flag, BIO_VLIST.
sys/sys/uio.h:
Add prototypes for physcopyin_vlist() and physcopyout_vlist().
share/man/man4/pass.4:
Document the CAMIOQUEUE and CAMIOGET ioctls.
usr.sbin/Makefile:
Add camdd.
usr.sbin/camdd/Makefile:
Add a makefile for camdd(8).
usr.sbin/camdd/camdd.8:
Man page for camdd(8).
usr.sbin/camdd/camdd.c:
The new camdd(8) utility.
Sponsored by: Spectra Logic
MFC after: 1 week
2015-12-03 20:54:55 +00:00
|
|
|
bp2->bio_flags = bp->bio_flags &
|
|
|
|
|
(BIO_ORDERED | BIO_UNMAPPED | BIO_VLIST);
|
2002-09-27 20:53:47 +00:00
|
|
|
bp2->bio_length = bp->bio_length;
|
|
|
|
|
bp2->bio_offset = bp->bio_offset;
|
|
|
|
|
bp2->bio_data = bp->bio_data;
|
Implement the concept of the unmapped VMIO buffers, i.e. buffers which
do not map the b_pages pages into buffer_map KVA. The use of the
unmapped buffers eliminate the need to perform TLB shootdown for
mapping on the buffer creation and reuse, greatly reducing the amount
of IPIs for shootdown on big-SMP machines and eliminating up to 25-30%
of the system time on i/o intensive workloads.
The unmapped buffer should be explicitely requested by the GB_UNMAPPED
flag by the consumer. For unmapped buffer, no KVA reservation is
performed at all. The consumer might request unmapped buffer which
does have a KVA reserve, to manually map it without recursing into
buffer cache and blocking, with the GB_KVAALLOC flag.
When the mapped buffer is requested and unmapped buffer already
exists, the cache performs an upgrade, possibly reusing the KVA
reservation.
Unmapped buffer is translated into unmapped bio in g_vfs_strategy().
Unmapped bio carry a pointer to the vm_page_t array, offset and length
instead of the data pointer. The provider which processes the bio
should explicitely specify a readiness to accept unmapped bio,
otherwise g_down geom thread performs the transient upgrade of the bio
request by mapping the pages into the new bio_transient_map KVA
submap.
The bio_transient_map submap claims up to 10% of the buffer map, and
the total buffer_map + bio_transient_map KVA usage stays the
same. Still, it could be manually tuned by kern.bio_transient_maxcnt
tunable, in the units of the transient mappings. Eventually, the
bio_transient_map could be removed after all geom classes and drivers
can accept unmapped i/o requests.
Unmapped support can be turned off by the vfs.unmapped_buf_allowed
tunable, disabling which makes the buffer (or cluster) creation
requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped
buffers are only enabled by default on the architectures where
pmap_copy_page() was implemented and tested.
In the rework, filesystem metadata is not the subject to maxbufspace
limit anymore. Since the metadata buffers are always mapped, the
buffers still have to fit into the buffer map, which provides a
reasonable (but practically unreachable) upper bound on it. The
non-metadata buffer allocations, both mapped and unmapped, is
accounted against maxbufspace, as before. Effectively, this means that
the maxbufspace is forced on mapped and unmapped buffers separately.
The pre-patch bufspace limiting code did not worked, because
buffer_map fragmentation does not allow the limit to be reached.
By Jeff Roberson request, the getnewbuf() function was split into
smaller single-purpose functions.
Sponsored by: The FreeBSD Foundation
Discussed with: jeff (previous version)
Tested by: pho, scottl (previous version), jhb, bf
MFC after: 2 weeks
2013-03-19 14:13:12 +00:00
|
|
|
bp2->bio_ma = bp->bio_ma;
|
|
|
|
|
bp2->bio_ma_n = bp->bio_ma_n;
|
|
|
|
|
bp2->bio_ma_offset = bp->bio_ma_offset;
|
2002-09-27 20:53:47 +00:00
|
|
|
bp2->bio_attribute = bp->bio_attribute;
|
2009-06-11 09:55:26 +00:00
|
|
|
/* Inherit classification info from the parent */
|
|
|
|
|
bp2->bio_classifier1 = bp->bio_classifier1;
|
|
|
|
|
bp2->bio_classifier2 = bp->bio_classifier2;
|
2003-02-07 23:08:24 +00:00
|
|
|
bp->bio_children++;
|
2002-09-27 20:53:47 +00:00
|
|
|
}
|
2005-08-29 11:39:24 +00:00
|
|
|
#ifdef KTR
|
2007-10-26 06:55:00 +00:00
|
|
|
if ((KTR_COMPILE & KTR_GEOM) && (ktr_mask & KTR_GEOM)) {
|
2005-08-29 11:39:24 +00:00
|
|
|
struct stack st;
|
|
|
|
|
|
2006-03-13 14:59:57 +00:00
|
|
|
CTR2(KTR_GEOM, "g_clone_bio(%p): %p", bp, bp2);
|
2005-08-29 11:39:24 +00:00
|
|
|
stack_save(&st);
|
|
|
|
|
CTRSTACK(KTR_GEOM, &st, 3, 0);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
2002-03-11 21:42:35 +00:00
|
|
|
return(bp2);
|
|
|
|
|
}
|
|
|
|
|
|
2006-06-05 21:13:22 +00:00
|
|
|
struct bio *
|
|
|
|
|
g_duplicate_bio(struct bio *bp)
|
|
|
|
|
{
|
|
|
|
|
struct bio *bp2;
|
|
|
|
|
|
|
|
|
|
bp2 = uma_zalloc(biozone, M_WAITOK | M_ZERO);
|
Add asynchronous command support to the pass(4) driver, and the new
camdd(8) utility.
CCBs may be queued to the driver via the new CAMIOQUEUE ioctl, and
completed CCBs may be retrieved via the CAMIOGET ioctl. User
processes can use poll(2) or kevent(2) to get notification when
I/O has completed.
While the existing CAMIOCOMMAND blocking ioctl interface only
supports user virtual data pointers in a CCB (generally only
one per CCB), the new CAMIOQUEUE ioctl supports user virtual and
physical address pointers, as well as user virtual and physical
scatter/gather lists. This allows user applications to have more
flexibility in their data handling operations.
Kernel memory for data transferred via the queued interface is
allocated from the zone allocator in MAXPHYS sized chunks, and user
data is copied in and out. This is likely faster than the
vmapbuf()/vunmapbuf() method used by the CAMIOCOMMAND ioctl in
configurations with many processors (there are more TLB shootdowns
caused by the mapping/unmapping operation) but may not be as fast
as running with unmapped I/O.
The new memory handling model for user requests also allows
applications to send CCBs with request sizes that are larger than
MAXPHYS. The pass(4) driver now limits queued requests to the I/O
size listed by the SIM driver in the maxio field in the Path
Inquiry (XPT_PATH_INQ) CCB.
There are some things things would be good to add:
1. Come up with a way to do unmapped I/O on multiple buffers.
Currently the unmapped I/O interface operates on a struct bio,
which includes only one address and length. It would be nice
to be able to send an unmapped scatter/gather list down to
busdma. This would allow eliminating the copy we currently do
for data.
2. Add an ioctl to list currently outstanding CCBs in the various
queues.
3. Add an ioctl to cancel a request, or use the XPT_ABORT CCB to do
that.
4. Test physical address support. Virtual pointers and scatter
gather lists have been tested, but I have not yet tested
physical addresses or scatter/gather lists.
5. Investigate multiple queue support. At the moment there is one
queue of commands per pass(4) device. If multiple processes
open the device, they will submit I/O into the same queue and
get events for the same completions. This is probably the right
model for most applications, but it is something that could be
changed later on.
Also, add a new utility, camdd(8) that uses the asynchronous pass(4)
driver interface.
This utility is intended to be a basic data transfer/copy utility,
a simple benchmark utility, and an example of how to use the
asynchronous pass(4) interface.
It can copy data to and from pass(4) devices using any target queue
depth, starting offset and blocksize for the input and ouptut devices.
It currently only supports SCSI devices, but could be easily extended
to support ATA devices.
It can also copy data to and from regular files, block devices, tape
devices, pipes, stdin, and stdout. It does not support queueing
multiple commands to any of those targets, since it uses the standard
read(2)/write(2)/writev(2)/readv(2) system calls.
The I/O is done by two threads, one for the reader and one for the
writer. The reader thread sends completed read requests to the
writer thread in strictly sequential order, even if they complete
out of order. That could be modified later on for random I/O patterns
or slightly out of order I/O.
camdd(8) uses kqueue(2)/kevent(2) to get I/O completion events from
the pass(4) driver and also to send request notifications internally.
For pass(4) devcies, camdd(8) uses a single buffer (CAM_DATA_VADDR)
per CAM CCB on the reading side, and a scatter/gather list
(CAM_DATA_SG) on the writing side. In addition to testing both
interfaces, this makes any potential reblocking of I/O easier. No
data is copied between the reader and the writer, but rather the
reader's buffers are split into multiple I/O requests or combined
into a single I/O request depending on the input and output blocksize.
For the file I/O path, camdd(8) also uses a single buffer (read(2),
write(2), pread(2) or pwrite(2)) on reads, and a scatter/gather list
(readv(2), writev(2), preadv(2), pwritev(2)) on writes.
Things that would be nice to do for camdd(8) eventually:
1. Add support for I/O pattern generation. Patterns like all
zeros, all ones, LBA-based patterns, random patterns, etc. Right
Now you can always use /dev/zero, /dev/random, etc.
2. Add support for a "sink" mode, so we do only reads with no
writes. Right now, you can use /dev/null.
3. Add support for automatic queue depth probing, so that we can
figure out the right queue depth on the input and output side
for maximum throughput. At the moment it defaults to 6.
4. Add support for SATA device passthrough I/O.
5. Add support for random LBAs and/or lengths on the input and
output sides.
6. Track average per-I/O latency and busy time. The busy time
and latency could also feed in to the automatic queue depth
determination.
sys/cam/scsi/scsi_pass.h:
Define two new ioctls, CAMIOQUEUE and CAMIOGET, that queue
and fetch asynchronous CAM CCBs respectively.
Although these ioctls do not have a declared argument, they
both take a union ccb pointer. If we declare a size here,
the ioctl code in sys/kern/sys_generic.c will malloc and free
a buffer for either the CCB or the CCB pointer (depending on
how it is declared). Since we have to keep a copy of the
CCB (which is fairly large) anyway, having the ioctl malloc
and free a CCB for each call is wasteful.
sys/cam/scsi/scsi_pass.c:
Add asynchronous CCB support.
Add two new ioctls, CAMIOQUEUE and CAMIOGET.
CAMIOQUEUE adds a CCB to the incoming queue. The CCB is
executed immediately (and moved to the active queue) if it
is an immediate CCB, but otherwise it will be executed
in passstart() when a CCB is available from the transport layer.
When CCBs are completed (because they are immediate or
passdone() if they are queued), they are put on the done
queue.
If we get the final close on the device before all pending
I/O is complete, all active I/O is moved to the abandoned
queue and we increment the peripheral reference count so
that the peripheral driver instance doesn't go away before
all pending I/O is done.
The new passcreatezone() function is called on the first
call to the CAMIOQUEUE ioctl on a given device to allocate
the UMA zones for I/O requests and S/G list buffers. This
may be good to move off to a taskqueue at some point.
The new passmemsetup() function allocates memory and
scatter/gather lists to hold the user's data, and copies
in any data that needs to be written. For virtual pointers
(CAM_DATA_VADDR), the kernel buffer is malloced from the
new pass(4) driver malloc bucket. For virtual
scatter/gather lists (CAM_DATA_SG), buffers are allocated
from a new per-pass(9) UMA zone in MAXPHYS-sized chunks.
Physical pointers are passed in unchanged. We have support
for up to 16 scatter/gather segments (for the user and
kernel S/G lists) in the default struct pass_io_req, so
requests with longer S/G lists require an extra kernel malloc.
The new passcopysglist() function copies a user scatter/gather
list to a kernel scatter/gather list. The number of elements
in each list may be different, but (obviously) the amount of data
stored has to be identical.
The new passmemdone() function copies data out for the
CAM_DATA_VADDR and CAM_DATA_SG cases.
The new passiocleanup() function restores data pointers in
user CCBs and frees memory.
Add new functions to support kqueue(2)/kevent(2):
passreadfilt() tells kevent whether or not the done
queue is empty.
passkqfilter() adds a knote to our list.
passreadfiltdetach() removes a knote from our list.
Add a new function, passpoll(), for poll(2)/select(2)
to use.
Add devstat(9) support for the queued CCB path.
sys/cam/ata/ata_da.c:
Add support for the BIO_VLIST bio type.
sys/cam/cam_ccb.h:
Add a new enumeration for the xflags field in the CCB header.
(This doesn't change the CCB header, just adds an enumeration to
use.)
sys/cam/cam_xpt.c:
Add a new function, xpt_setup_ccb_flags(), that allows specifying
CCB flags.
sys/cam/cam_xpt.h:
Add a prototype for xpt_setup_ccb_flags().
sys/cam/scsi/scsi_da.c:
Add support for BIO_VLIST.
sys/dev/md/md.c:
Add BIO_VLIST support to md(4).
sys/geom/geom_disk.c:
Add BIO_VLIST support to the GEOM disk class. Re-factor the I/O size
limiting code in g_disk_start() a bit.
sys/kern/subr_bus_dma.c:
Change _bus_dmamap_load_vlist() to take a starting offset and
length.
Add a new function, _bus_dmamap_load_pages(), that will load a list
of physical pages starting at an offset.
Update _bus_dmamap_load_bio() to allow loading BIO_VLIST bios.
Allow unmapped I/O to start at an offset.
sys/kern/subr_uio.c:
Add two new functions, physcopyin_vlist() and physcopyout_vlist().
sys/pc98/include/bus.h:
Guard kernel-only parts of the pc98 machine/bus.h header with
#ifdef _KERNEL.
This allows userland programs to include <machine/bus.h> to get the
definition of bus_addr_t and bus_size_t.
sys/sys/bio.h:
Add a new bio flag, BIO_VLIST.
sys/sys/uio.h:
Add prototypes for physcopyin_vlist() and physcopyout_vlist().
share/man/man4/pass.4:
Document the CAMIOQUEUE and CAMIOGET ioctls.
usr.sbin/Makefile:
Add camdd.
usr.sbin/camdd/Makefile:
Add a makefile for camdd(8).
usr.sbin/camdd/camdd.8:
Man page for camdd(8).
usr.sbin/camdd/camdd.c:
The new camdd(8) utility.
Sponsored by: Spectra Logic
MFC after: 1 week
2015-12-03 20:54:55 +00:00
|
|
|
bp2->bio_flags = bp->bio_flags & (BIO_UNMAPPED | BIO_VLIST);
|
2006-06-05 21:13:22 +00:00
|
|
|
bp2->bio_parent = bp;
|
|
|
|
|
bp2->bio_cmd = bp->bio_cmd;
|
|
|
|
|
bp2->bio_length = bp->bio_length;
|
|
|
|
|
bp2->bio_offset = bp->bio_offset;
|
|
|
|
|
bp2->bio_data = bp->bio_data;
|
Implement the concept of the unmapped VMIO buffers, i.e. buffers which
do not map the b_pages pages into buffer_map KVA. The use of the
unmapped buffers eliminate the need to perform TLB shootdown for
mapping on the buffer creation and reuse, greatly reducing the amount
of IPIs for shootdown on big-SMP machines and eliminating up to 25-30%
of the system time on i/o intensive workloads.
The unmapped buffer should be explicitely requested by the GB_UNMAPPED
flag by the consumer. For unmapped buffer, no KVA reservation is
performed at all. The consumer might request unmapped buffer which
does have a KVA reserve, to manually map it without recursing into
buffer cache and blocking, with the GB_KVAALLOC flag.
When the mapped buffer is requested and unmapped buffer already
exists, the cache performs an upgrade, possibly reusing the KVA
reservation.
Unmapped buffer is translated into unmapped bio in g_vfs_strategy().
Unmapped bio carry a pointer to the vm_page_t array, offset and length
instead of the data pointer. The provider which processes the bio
should explicitely specify a readiness to accept unmapped bio,
otherwise g_down geom thread performs the transient upgrade of the bio
request by mapping the pages into the new bio_transient_map KVA
submap.
The bio_transient_map submap claims up to 10% of the buffer map, and
the total buffer_map + bio_transient_map KVA usage stays the
same. Still, it could be manually tuned by kern.bio_transient_maxcnt
tunable, in the units of the transient mappings. Eventually, the
bio_transient_map could be removed after all geom classes and drivers
can accept unmapped i/o requests.
Unmapped support can be turned off by the vfs.unmapped_buf_allowed
tunable, disabling which makes the buffer (or cluster) creation
requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped
buffers are only enabled by default on the architectures where
pmap_copy_page() was implemented and tested.
In the rework, filesystem metadata is not the subject to maxbufspace
limit anymore. Since the metadata buffers are always mapped, the
buffers still have to fit into the buffer map, which provides a
reasonable (but practically unreachable) upper bound on it. The
non-metadata buffer allocations, both mapped and unmapped, is
accounted against maxbufspace, as before. Effectively, this means that
the maxbufspace is forced on mapped and unmapped buffers separately.
The pre-patch bufspace limiting code did not worked, because
buffer_map fragmentation does not allow the limit to be reached.
By Jeff Roberson request, the getnewbuf() function was split into
smaller single-purpose functions.
Sponsored by: The FreeBSD Foundation
Discussed with: jeff (previous version)
Tested by: pho, scottl (previous version), jhb, bf
MFC after: 2 weeks
2013-03-19 14:13:12 +00:00
|
|
|
bp2->bio_ma = bp->bio_ma;
|
|
|
|
|
bp2->bio_ma_n = bp->bio_ma_n;
|
|
|
|
|
bp2->bio_ma_offset = bp->bio_ma_offset;
|
2006-06-05 21:13:22 +00:00
|
|
|
bp2->bio_attribute = bp->bio_attribute;
|
|
|
|
|
bp->bio_children++;
|
|
|
|
|
#ifdef KTR
|
2007-10-26 06:55:00 +00:00
|
|
|
if ((KTR_COMPILE & KTR_GEOM) && (ktr_mask & KTR_GEOM)) {
|
2006-06-05 21:13:22 +00:00
|
|
|
struct stack st;
|
|
|
|
|
|
|
|
|
|
CTR2(KTR_GEOM, "g_duplicate_bio(%p): %p", bp, bp2);
|
|
|
|
|
stack_save(&st);
|
|
|
|
|
CTRSTACK(KTR_GEOM, &st, 3, 0);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
return(bp2);
|
|
|
|
|
}
|
|
|
|
|
|
2002-03-11 21:42:35 +00:00
|
|
|
void
|
|
|
|
|
g_io_init()
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
g_bioq_init(&g_bio_run_down);
|
|
|
|
|
g_bioq_init(&g_bio_run_up);
|
2004-01-28 08:39:18 +00:00
|
|
|
g_bioq_init(&g_bio_run_task);
|
2003-05-02 12:36:12 +00:00
|
|
|
biozone = uma_zcreate("g_bio", sizeof (struct bio),
|
|
|
|
|
NULL, NULL,
|
|
|
|
|
NULL, NULL,
|
|
|
|
|
0, 0);
|
2002-03-11 21:42:35 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
2002-04-09 15:12:05 +00:00
|
|
|
g_io_getattr(const char *attr, struct g_consumer *cp, int *len, void *ptr)
|
2002-03-11 21:42:35 +00:00
|
|
|
{
|
|
|
|
|
struct bio *bp;
|
|
|
|
|
int error;
|
|
|
|
|
|
|
|
|
|
g_trace(G_T_BIO, "bio_getattr(%s)", attr);
|
2004-08-27 14:43:11 +00:00
|
|
|
bp = g_alloc_bio();
|
2002-10-08 07:03:58 +00:00
|
|
|
bp->bio_cmd = BIO_GETATTR;
|
|
|
|
|
bp->bio_done = NULL;
|
|
|
|
|
bp->bio_attribute = attr;
|
|
|
|
|
bp->bio_length = *len;
|
|
|
|
|
bp->bio_data = ptr;
|
|
|
|
|
g_io_request(bp, cp);
|
|
|
|
|
error = biowait(bp, "ggetattr");
|
|
|
|
|
*len = bp->bio_completed;
|
|
|
|
|
g_destroy_bio(bp);
|
2002-03-11 21:42:35 +00:00
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
|
2006-10-31 21:11:21 +00:00
|
|
|
int
|
|
|
|
|
g_io_flush(struct g_consumer *cp)
|
|
|
|
|
{
|
|
|
|
|
struct bio *bp;
|
|
|
|
|
int error;
|
|
|
|
|
|
|
|
|
|
g_trace(G_T_BIO, "bio_flush(%s)", cp->provider->name);
|
|
|
|
|
bp = g_alloc_bio();
|
|
|
|
|
bp->bio_cmd = BIO_FLUSH;
|
Correct bioq_disksort so that bioq_insert_tail() offers barrier semantic.
Add the BIO_ORDERED flag for struct bio and update bio clients to use it.
The barrier semantics of bioq_insert_tail() were broken in two ways:
o In bioq_disksort(), an added bio could be inserted at the head of
the queue, even when a barrier was present, if the sort key for
the new entry was less than that of the last queued barrier bio.
o The last_offset used to generate the sort key for newly queued bios
did not stay at the position of the barrier until either the
barrier was de-queued, or a new barrier (which updates last_offset)
was queued. When a barrier is in effect, we know that the disk
will pass through the barrier position just before the
"blocked bios" are released, so using the barrier's offset for
last_offset is the optimal choice.
sys/geom/sched/subr_disk.c:
sys/kern/subr_disk.c:
o Update last_offset in bioq_insert_tail().
o Only update last_offset in bioq_remove() if the removed bio is
at the head of the queue (typically due to a call via
bioq_takefirst()) and no barrier is active.
o In bioq_disksort(), if we have a barrier (insert_point is non-NULL),
set prev to the barrier and cur to it's next element. Now that
last_offset is kept at the barrier position, this change isn't
strictly necessary, but since we have to take a decision branch
anyway, it does avoid one, no-op, loop iteration in the while
loop that immediately follows.
o In bioq_disksort(), bypass the normal sort for bios with the
BIO_ORDERED attribute and instead insert them into the queue
with bioq_insert_tail(). bioq_insert_tail() not only gives
the desired command order during insertion, but also provides
barrier semantics so that commands disksorted in the future
cannot pass the just enqueued transaction.
sys/sys/bio.h:
Add BIO_ORDERED as bit 4 of the bio_flags field in struct bio.
sys/cam/ata/ata_da.c:
sys/cam/scsi/scsi_da.c
Use an ordered command for SCSI/ATA-NCQ commands issued in
response to bios with the BIO_ORDERED flag set.
sys/cam/scsi/scsi_da.c
Use an ordered tag when issuing a synchronize cache command.
Wrap some lines to 80 columns.
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
sys/geom/geom_io.c
Mark bios with the BIO_FLUSH command as BIO_ORDERED.
Sponsored by: Spectra Logic Corporation
MFC after: 1 month
2010-09-02 19:40:28 +00:00
|
|
|
bp->bio_flags |= BIO_ORDERED;
|
2006-10-31 21:11:21 +00:00
|
|
|
bp->bio_done = NULL;
|
|
|
|
|
bp->bio_attribute = NULL;
|
|
|
|
|
bp->bio_offset = cp->provider->mediasize;
|
|
|
|
|
bp->bio_length = 0;
|
|
|
|
|
bp->bio_data = NULL;
|
|
|
|
|
g_io_request(bp, cp);
|
|
|
|
|
error = biowait(bp, "gflush");
|
|
|
|
|
g_destroy_bio(bp);
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
|
2003-02-06 21:01:36 +00:00
|
|
|
static int
|
|
|
|
|
g_io_check(struct bio *bp)
|
2002-03-11 21:42:35 +00:00
|
|
|
{
|
2003-02-06 21:01:36 +00:00
|
|
|
struct g_consumer *cp;
|
|
|
|
|
struct g_provider *pp;
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
off_t excess;
|
|
|
|
|
int error;
|
2002-03-11 21:42:35 +00:00
|
|
|
|
2003-02-06 21:01:36 +00:00
|
|
|
cp = bp->bio_from;
|
|
|
|
|
pp = bp->bio_to;
|
2002-03-11 21:42:35 +00:00
|
|
|
|
2003-02-06 21:01:36 +00:00
|
|
|
/* Fail if access counters dont allow the operation */
|
2002-04-04 09:58:20 +00:00
|
|
|
switch(bp->bio_cmd) {
|
|
|
|
|
case BIO_READ:
|
|
|
|
|
case BIO_GETATTR:
|
2003-02-06 21:01:36 +00:00
|
|
|
if (cp->acr == 0)
|
|
|
|
|
return (EPERM);
|
2002-04-04 09:58:20 +00:00
|
|
|
break;
|
|
|
|
|
case BIO_WRITE:
|
|
|
|
|
case BIO_DELETE:
|
2006-10-31 21:11:21 +00:00
|
|
|
case BIO_FLUSH:
|
2003-02-06 21:01:36 +00:00
|
|
|
if (cp->acw == 0)
|
|
|
|
|
return (EPERM);
|
2002-04-04 09:58:20 +00:00
|
|
|
break;
|
|
|
|
|
default:
|
2003-02-06 21:01:36 +00:00
|
|
|
return (EPERM);
|
2002-03-11 21:42:35 +00:00
|
|
|
}
|
2002-04-04 09:58:20 +00:00
|
|
|
/* if provider is marked for error, don't disturb. */
|
2003-02-06 21:01:36 +00:00
|
|
|
if (pp->error)
|
|
|
|
|
return (pp->error);
|
2012-07-29 11:51:48 +00:00
|
|
|
if (cp->flags & G_CF_ORPHAN)
|
|
|
|
|
return (ENXIO);
|
2003-02-06 21:01:36 +00:00
|
|
|
|
2002-04-04 09:58:20 +00:00
|
|
|
switch(bp->bio_cmd) {
|
|
|
|
|
case BIO_READ:
|
|
|
|
|
case BIO_WRITE:
|
|
|
|
|
case BIO_DELETE:
|
2010-04-15 08:39:56 +00:00
|
|
|
/* Zero sectorsize or mediasize is probably a lack of media. */
|
|
|
|
|
if (pp->sectorsize == 0 || pp->mediasize == 0)
|
2003-10-22 06:32:20 +00:00
|
|
|
return (ENXIO);
|
2002-12-18 19:53:59 +00:00
|
|
|
/* Reject I/O not on sector boundary */
|
2003-02-06 21:01:36 +00:00
|
|
|
if (bp->bio_offset % pp->sectorsize)
|
|
|
|
|
return (EINVAL);
|
2002-12-18 19:53:59 +00:00
|
|
|
/* Reject I/O not integral sector long */
|
2003-02-06 21:01:36 +00:00
|
|
|
if (bp->bio_length % pp->sectorsize)
|
|
|
|
|
return (EINVAL);
|
2003-10-19 19:06:54 +00:00
|
|
|
/* Reject requests before or past the end of media. */
|
|
|
|
|
if (bp->bio_offset < 0)
|
|
|
|
|
return (EIO);
|
2003-02-06 21:01:36 +00:00
|
|
|
if (bp->bio_offset > pp->mediasize)
|
|
|
|
|
return (EIO);
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
|
|
|
|
|
/* Truncate requests to the end of providers media. */
|
|
|
|
|
excess = bp->bio_offset + bp->bio_length;
|
|
|
|
|
if (excess > bp->bio_to->mediasize) {
|
|
|
|
|
KASSERT((bp->bio_flags & BIO_UNMAPPED) == 0 ||
|
|
|
|
|
round_page(bp->bio_ma_offset +
|
|
|
|
|
bp->bio_length) / PAGE_SIZE == bp->bio_ma_n,
|
|
|
|
|
("excess bio %p too short", bp));
|
|
|
|
|
excess -= bp->bio_to->mediasize;
|
|
|
|
|
bp->bio_length -= excess;
|
|
|
|
|
if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
|
|
|
|
|
bp->bio_ma_n = round_page(bp->bio_ma_offset +
|
|
|
|
|
bp->bio_length) / PAGE_SIZE;
|
|
|
|
|
}
|
|
|
|
|
if (excess > 0)
|
|
|
|
|
CTR3(KTR_GEOM, "g_down truncated bio "
|
|
|
|
|
"%p provider %s by %d", bp,
|
|
|
|
|
bp->bio_to->name, excess);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Deliver zero length transfers right here. */
|
|
|
|
|
if (bp->bio_length == 0) {
|
|
|
|
|
CTR2(KTR_GEOM, "g_down terminated 0-length "
|
|
|
|
|
"bp %p provider %s", bp, bp->bio_to->name);
|
|
|
|
|
return (0);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if ((bp->bio_flags & BIO_UNMAPPED) != 0 &&
|
|
|
|
|
(bp->bio_to->flags & G_PF_ACCEPT_UNMAPPED) == 0 &&
|
|
|
|
|
(bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE)) {
|
|
|
|
|
if ((error = g_io_transient_map_bio(bp)) >= 0)
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
2002-04-04 09:58:20 +00:00
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
break;
|
2002-03-11 21:42:35 +00:00
|
|
|
}
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
return (EJUSTRETURN);
|
2003-02-06 21:01:36 +00:00
|
|
|
}
|
|
|
|
|
|
2009-06-11 09:55:26 +00:00
|
|
|
/*
|
|
|
|
|
* bio classification support.
|
|
|
|
|
*
|
|
|
|
|
* g_register_classifier() and g_unregister_classifier()
|
|
|
|
|
* are used to add/remove a classifier from the list.
|
|
|
|
|
* The list is protected using the g_bio_run_down lock,
|
|
|
|
|
* because the classifiers are called in this path.
|
|
|
|
|
*
|
|
|
|
|
* g_io_request() passes bio's that are not already classified
|
|
|
|
|
* (i.e. those with bio_classifier1 == NULL) to g_run_classifiers().
|
|
|
|
|
* Classifiers can store their result in the two fields
|
|
|
|
|
* bio_classifier1 and bio_classifier2.
|
|
|
|
|
* A classifier that updates one of the fields should
|
|
|
|
|
* return a non-zero value.
|
|
|
|
|
* If no classifier updates the field, g_run_classifiers() sets
|
|
|
|
|
* bio_classifier1 = BIO_NOTCLASSIFIED to avoid further calls.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
g_register_classifier(struct g_classifier_hook *hook)
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
g_bioq_lock(&g_bio_run_down);
|
|
|
|
|
TAILQ_INSERT_TAIL(&g_classifier_tailq, hook, link);
|
|
|
|
|
g_bioq_unlock(&g_bio_run_down);
|
|
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
g_unregister_classifier(struct g_classifier_hook *hook)
|
|
|
|
|
{
|
|
|
|
|
struct g_classifier_hook *entry;
|
|
|
|
|
|
|
|
|
|
g_bioq_lock(&g_bio_run_down);
|
|
|
|
|
TAILQ_FOREACH(entry, &g_classifier_tailq, link) {
|
|
|
|
|
if (entry == hook) {
|
|
|
|
|
TAILQ_REMOVE(&g_classifier_tailq, hook, link);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
g_bioq_unlock(&g_bio_run_down);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
g_run_classifiers(struct bio *bp)
|
|
|
|
|
{
|
|
|
|
|
struct g_classifier_hook *hook;
|
|
|
|
|
int classified = 0;
|
|
|
|
|
|
|
|
|
|
TAILQ_FOREACH(hook, &g_classifier_tailq, link)
|
|
|
|
|
classified |= hook->func(hook->arg, bp);
|
|
|
|
|
|
|
|
|
|
if (!classified)
|
|
|
|
|
bp->bio_classifier1 = BIO_NOTCLASSIFIED;
|
|
|
|
|
}
|
|
|
|
|
|
2003-02-06 21:01:36 +00:00
|
|
|
void
|
|
|
|
|
g_io_request(struct bio *bp, struct g_consumer *cp)
|
|
|
|
|
{
|
2003-02-07 23:08:24 +00:00
|
|
|
struct g_provider *pp;
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
struct mtx *mtxp;
|
|
|
|
|
int direct, error, first;
|
2003-02-06 21:01:36 +00:00
|
|
|
|
|
|
|
|
KASSERT(cp != NULL, ("NULL cp in g_io_request"));
|
|
|
|
|
KASSERT(bp != NULL, ("NULL bp in g_io_request"));
|
2003-09-11 00:49:02 +00:00
|
|
|
pp = cp->provider;
|
2003-02-07 23:08:24 +00:00
|
|
|
KASSERT(pp != NULL, ("consumer not attached in g_io_request"));
|
2006-03-01 19:01:58 +00:00
|
|
|
#ifdef DIAGNOSTIC
|
|
|
|
|
KASSERT(bp->bio_driver1 == NULL,
|
|
|
|
|
("bio_driver1 used by the consumer (geom %s)", cp->geom->name));
|
|
|
|
|
KASSERT(bp->bio_driver2 == NULL,
|
|
|
|
|
("bio_driver2 used by the consumer (geom %s)", cp->geom->name));
|
|
|
|
|
KASSERT(bp->bio_pflags == 0,
|
|
|
|
|
("bio_pflags used by the consumer (geom %s)", cp->geom->name));
|
|
|
|
|
/*
|
|
|
|
|
* Remember consumer's private fields, so we can detect if they were
|
|
|
|
|
* modified by the provider.
|
|
|
|
|
*/
|
|
|
|
|
bp->_bio_caller1 = bp->bio_caller1;
|
|
|
|
|
bp->_bio_caller2 = bp->bio_caller2;
|
|
|
|
|
bp->_bio_cflags = bp->bio_cflags;
|
|
|
|
|
#endif
|
2003-02-07 23:08:24 +00:00
|
|
|
|
2007-01-28 23:36:07 +00:00
|
|
|
if (bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_GETATTR)) {
|
2006-10-31 21:11:21 +00:00
|
|
|
KASSERT(bp->bio_data != NULL,
|
2007-01-28 23:36:07 +00:00
|
|
|
("NULL bp->data in g_io_request(cmd=%hhu)", bp->bio_cmd));
|
|
|
|
|
}
|
|
|
|
|
if (bp->bio_cmd & (BIO_DELETE|BIO_FLUSH)) {
|
|
|
|
|
KASSERT(bp->bio_data == NULL,
|
|
|
|
|
("non-NULL bp->data in g_io_request(cmd=%hhu)",
|
|
|
|
|
bp->bio_cmd));
|
2006-10-31 21:11:21 +00:00
|
|
|
}
|
2004-08-30 09:33:06 +00:00
|
|
|
if (bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) {
|
|
|
|
|
KASSERT(bp->bio_offset % cp->provider->sectorsize == 0,
|
|
|
|
|
("wrong offset %jd for sectorsize %u",
|
|
|
|
|
bp->bio_offset, cp->provider->sectorsize));
|
|
|
|
|
KASSERT(bp->bio_length % cp->provider->sectorsize == 0,
|
|
|
|
|
("wrong length %jd for sectorsize %u",
|
|
|
|
|
bp->bio_length, cp->provider->sectorsize));
|
|
|
|
|
}
|
|
|
|
|
|
2004-10-11 21:22:59 +00:00
|
|
|
g_trace(G_T_BIO, "bio_request(%p) from %p(%s) to %p(%s) cmd %d",
|
|
|
|
|
bp, cp, cp->geom->name, pp, pp->name, bp->bio_cmd);
|
|
|
|
|
|
2003-02-06 21:01:36 +00:00
|
|
|
bp->bio_from = cp;
|
2003-02-07 23:08:24 +00:00
|
|
|
bp->bio_to = pp;
|
2003-02-06 21:01:36 +00:00
|
|
|
bp->bio_error = 0;
|
|
|
|
|
bp->bio_completed = 0;
|
|
|
|
|
|
2004-09-28 11:56:37 +00:00
|
|
|
KASSERT(!(bp->bio_flags & BIO_ONQUEUE),
|
|
|
|
|
("Bio already on queue bp=%p", bp));
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
if ((g_collectstats & G_STATS_CONSUMERS) != 0 ||
|
|
|
|
|
((g_collectstats & G_STATS_PROVIDERS) != 0 && pp->stat != NULL))
|
2010-03-24 18:04:25 +00:00
|
|
|
binuptime(&bp->bio_t0);
|
|
|
|
|
else
|
|
|
|
|
getbinuptime(&bp->bio_t0);
|
2005-07-25 21:12:54 +00:00
|
|
|
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
#ifdef GET_STACK_USAGE
|
2015-08-07 08:24:12 +00:00
|
|
|
direct = (cp->flags & G_CF_DIRECT_SEND) != 0 &&
|
|
|
|
|
(pp->flags & G_PF_DIRECT_RECEIVE) != 0 &&
|
|
|
|
|
!g_is_geom_thread(curthread) &&
|
|
|
|
|
((pp->flags & G_PF_ACCEPT_UNMAPPED) != 0 ||
|
After the introduction of direct dispatch, the pacing code in g_down()
broke in two ways. One, the pacing variable was accessed in multiple
threads in an unsafe way. Two, since large numbers of I/O could come
down from the buf layer at one time, large numbers of allocation
failures could happen all at once, resulting in a huge pace value that
would limit I/Os to 10 IOPS for minutes (or even hours) at a
time. While a real solution to these problems requires substantial
work (to go to a no-allocation after the first model, or to have some
way to wait for more memory with some kind of reserve for pager and
swapper requests), it is relatively easy to make this simplistic
pacing less pathological.
Move to using a volatile variable with loads and stores. While this is
a little racy, losing the race is safe: either you get memory and
proceed, or you don't and queue. Second, sleep for 1ms (or one tick, whichever
is larger) instead of 100ms. This removes the artificial 10 IOPS limit
while still easing up on new I/Os during memory shortages. Remove
tying the amount of time we do this to the number of failed requests
and do it only as long as we keep failing requests.
Finally, to avoid needless recursion when memory is tight (start ->
g_io_deliver() -> g_io_request() -> start -> ... until we use 1/2 the
stack), don't do direct dispatch while pacing. This should be a rare
event (not steady state) so the performance hit here is worth the
extra safety of not starving g_down() with directly dispatched I/O.
Differential Review: https://reviews.freebsd.org/D3546
2015-09-02 17:29:30 +00:00
|
|
|
(bp->bio_flags & BIO_UNMAPPED) == 0 || THREAD_CAN_SLEEP()) &&
|
|
|
|
|
pace == 0;
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
if (direct) {
|
|
|
|
|
/* Block direct execution if less then half of stack left. */
|
|
|
|
|
size_t st, su;
|
|
|
|
|
GET_STACK_USAGE(st, su);
|
|
|
|
|
if (su * 2 > st)
|
|
|
|
|
direct = 0;
|
|
|
|
|
}
|
|
|
|
|
#else
|
|
|
|
|
direct = 0;
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
if (!TAILQ_EMPTY(&g_classifier_tailq) && !bp->bio_classifier1) {
|
|
|
|
|
g_bioq_lock(&g_bio_run_down);
|
|
|
|
|
g_run_classifiers(bp);
|
|
|
|
|
g_bioq_unlock(&g_bio_run_down);
|
|
|
|
|
}
|
|
|
|
|
|
2005-07-25 21:12:54 +00:00
|
|
|
/*
|
|
|
|
|
* The statistics collection is lockless, as such, but we
|
|
|
|
|
* can not update one instance of the statistics from more
|
|
|
|
|
* than one thread at a time, so grab the lock first.
|
|
|
|
|
*/
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
mtxp = mtx_pool_find(mtxpool_sleep, pp);
|
|
|
|
|
mtx_lock(mtxp);
|
|
|
|
|
if (g_collectstats & G_STATS_PROVIDERS)
|
2004-09-28 11:56:37 +00:00
|
|
|
devstat_start_transaction(pp->stat, &bp->bio_t0);
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
if (g_collectstats & G_STATS_CONSUMERS)
|
2004-09-28 11:56:37 +00:00
|
|
|
devstat_start_transaction(cp->stat, &bp->bio_t0);
|
|
|
|
|
pp->nstart++;
|
2004-06-09 19:44:44 +00:00
|
|
|
cp->nstart++;
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
mtx_unlock(mtxp);
|
2003-02-06 21:01:36 +00:00
|
|
|
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
if (direct) {
|
|
|
|
|
error = g_io_check(bp);
|
|
|
|
|
if (error >= 0) {
|
|
|
|
|
CTR3(KTR_GEOM, "g_io_request g_io_check on bp %p "
|
|
|
|
|
"provider %s returned %d", bp, bp->bio_to->name,
|
|
|
|
|
error);
|
|
|
|
|
g_io_deliver(bp, error);
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
bp->bio_to->geom->start(bp);
|
|
|
|
|
} else {
|
|
|
|
|
g_bioq_lock(&g_bio_run_down);
|
|
|
|
|
first = TAILQ_EMPTY(&g_bio_run_down.bio_queue);
|
|
|
|
|
TAILQ_INSERT_TAIL(&g_bio_run_down.bio_queue, bp, bio_queue);
|
|
|
|
|
bp->bio_flags |= BIO_ONQUEUE;
|
|
|
|
|
g_bio_run_down.bio_queue_length++;
|
|
|
|
|
g_bioq_unlock(&g_bio_run_down);
|
|
|
|
|
/* Pass it on down. */
|
|
|
|
|
if (first)
|
|
|
|
|
wakeup(&g_wait_down);
|
|
|
|
|
}
|
2002-03-11 21:42:35 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
2002-09-30 08:54:46 +00:00
|
|
|
g_io_deliver(struct bio *bp, int error)
|
2002-03-11 21:42:35 +00:00
|
|
|
{
|
2013-10-16 09:12:40 +00:00
|
|
|
struct bintime now;
|
2003-02-07 23:08:24 +00:00
|
|
|
struct g_consumer *cp;
|
|
|
|
|
struct g_provider *pp;
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
struct mtx *mtxp;
|
|
|
|
|
int direct, first;
|
2002-03-11 21:42:35 +00:00
|
|
|
|
2003-09-11 00:49:02 +00:00
|
|
|
KASSERT(bp != NULL, ("NULL bp in g_io_deliver"));
|
2003-02-07 23:08:24 +00:00
|
|
|
pp = bp->bio_to;
|
2003-10-06 09:07:35 +00:00
|
|
|
KASSERT(pp != NULL, ("NULL bio_to in g_io_deliver"));
|
|
|
|
|
cp = bp->bio_from;
|
|
|
|
|
if (cp == NULL) {
|
|
|
|
|
bp->bio_error = error;
|
|
|
|
|
bp->bio_done(bp);
|
|
|
|
|
return;
|
|
|
|
|
}
|
2003-02-07 23:08:24 +00:00
|
|
|
KASSERT(cp != NULL, ("NULL bio_from in g_io_deliver"));
|
|
|
|
|
KASSERT(cp->geom != NULL, ("NULL bio_from->geom in g_io_deliver"));
|
2009-06-30 14:34:06 +00:00
|
|
|
#ifdef DIAGNOSTIC
|
|
|
|
|
/*
|
|
|
|
|
* Some classes - GJournal in particular - can modify bio's
|
|
|
|
|
* private fields while the bio is in transit; G_GEOM_VOLATILE_BIO
|
|
|
|
|
* flag means it's an expected behaviour for that particular geom.
|
|
|
|
|
*/
|
|
|
|
|
if ((cp->geom->flags & G_GEOM_VOLATILE_BIO) == 0) {
|
|
|
|
|
KASSERT(bp->bio_caller1 == bp->_bio_caller1,
|
|
|
|
|
("bio_caller1 used by the provider %s", pp->name));
|
|
|
|
|
KASSERT(bp->bio_caller2 == bp->_bio_caller2,
|
|
|
|
|
("bio_caller2 used by the provider %s", pp->name));
|
|
|
|
|
KASSERT(bp->bio_cflags == bp->_bio_cflags,
|
|
|
|
|
("bio_cflags used by the provider %s", pp->name));
|
|
|
|
|
}
|
|
|
|
|
#endif
|
2004-04-04 20:37:28 +00:00
|
|
|
KASSERT(bp->bio_completed >= 0, ("bio_completed can't be less than 0"));
|
|
|
|
|
KASSERT(bp->bio_completed <= bp->bio_length,
|
|
|
|
|
("bio_completed can't be greater than bio_length"));
|
2002-12-26 21:02:50 +00:00
|
|
|
|
2002-03-11 21:42:35 +00:00
|
|
|
g_trace(G_T_BIO,
|
2002-12-26 21:02:50 +00:00
|
|
|
"g_io_deliver(%p) from %p(%s) to %p(%s) cmd %d error %d off %jd len %jd",
|
2003-02-07 23:08:24 +00:00
|
|
|
bp, cp, cp->geom->name, pp, pp->name, bp->bio_cmd, error,
|
2002-10-20 08:45:17 +00:00
|
|
|
(intmax_t)bp->bio_offset, (intmax_t)bp->bio_length);
|
2003-02-07 23:08:24 +00:00
|
|
|
|
2004-09-28 11:56:37 +00:00
|
|
|
KASSERT(!(bp->bio_flags & BIO_ONQUEUE),
|
|
|
|
|
("Bio already on queue bp=%p", bp));
|
|
|
|
|
|
2004-08-30 09:33:06 +00:00
|
|
|
/*
|
|
|
|
|
* XXX: next two doesn't belong here
|
|
|
|
|
*/
|
2003-03-18 09:42:33 +00:00
|
|
|
bp->bio_bcount = bp->bio_length;
|
2004-06-09 19:44:44 +00:00
|
|
|
bp->bio_resid = bp->bio_bcount - bp->bio_completed;
|
2004-09-28 11:56:37 +00:00
|
|
|
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
#ifdef GET_STACK_USAGE
|
|
|
|
|
direct = (pp->flags & G_PF_DIRECT_SEND) &&
|
|
|
|
|
(cp->flags & G_CF_DIRECT_RECEIVE) &&
|
|
|
|
|
!g_is_geom_thread(curthread);
|
|
|
|
|
if (direct) {
|
|
|
|
|
/* Block direct execution if less then half of stack left. */
|
|
|
|
|
size_t st, su;
|
|
|
|
|
GET_STACK_USAGE(st, su);
|
|
|
|
|
if (su * 2 > st)
|
|
|
|
|
direct = 0;
|
|
|
|
|
}
|
|
|
|
|
#else
|
|
|
|
|
direct = 0;
|
|
|
|
|
#endif
|
|
|
|
|
|
2005-07-25 21:12:54 +00:00
|
|
|
/*
|
|
|
|
|
* The statistics collection is lockless, as such, but we
|
|
|
|
|
* can not update one instance of the statistics from more
|
|
|
|
|
* than one thread at a time, so grab the lock first.
|
|
|
|
|
*/
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
if ((g_collectstats & G_STATS_CONSUMERS) != 0 ||
|
|
|
|
|
((g_collectstats & G_STATS_PROVIDERS) != 0 && pp->stat != NULL))
|
2013-10-16 09:12:40 +00:00
|
|
|
binuptime(&now);
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
mtxp = mtx_pool_find(mtxpool_sleep, cp);
|
|
|
|
|
mtx_lock(mtxp);
|
|
|
|
|
if (g_collectstats & G_STATS_PROVIDERS)
|
2013-10-16 09:12:40 +00:00
|
|
|
devstat_end_transaction_bio_bt(pp->stat, bp, &now);
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
if (g_collectstats & G_STATS_CONSUMERS)
|
2013-10-16 09:12:40 +00:00
|
|
|
devstat_end_transaction_bio_bt(cp->stat, bp, &now);
|
2003-03-09 09:59:48 +00:00
|
|
|
cp->nend++;
|
|
|
|
|
pp->nend++;
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
mtx_unlock(mtxp);
|
|
|
|
|
|
2004-09-28 11:56:37 +00:00
|
|
|
if (error != ENOMEM) {
|
|
|
|
|
bp->bio_error = error;
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
if (direct) {
|
|
|
|
|
biodone(bp);
|
|
|
|
|
} else {
|
|
|
|
|
g_bioq_lock(&g_bio_run_up);
|
|
|
|
|
first = TAILQ_EMPTY(&g_bio_run_up.bio_queue);
|
|
|
|
|
TAILQ_INSERT_TAIL(&g_bio_run_up.bio_queue, bp, bio_queue);
|
|
|
|
|
bp->bio_flags |= BIO_ONQUEUE;
|
|
|
|
|
g_bio_run_up.bio_queue_length++;
|
|
|
|
|
g_bioq_unlock(&g_bio_run_up);
|
|
|
|
|
if (first)
|
|
|
|
|
wakeup(&g_wait_up);
|
|
|
|
|
}
|
2002-11-02 11:08:07 +00:00
|
|
|
return;
|
|
|
|
|
}
|
2004-09-28 11:56:37 +00:00
|
|
|
|
|
|
|
|
if (bootverbose)
|
|
|
|
|
printf("ENOMEM %p on %p(%s)\n", bp, pp, pp->name);
|
|
|
|
|
bp->bio_children = 0;
|
|
|
|
|
bp->bio_inbed = 0;
|
2012-12-26 20:07:47 +00:00
|
|
|
bp->bio_driver1 = NULL;
|
|
|
|
|
bp->bio_driver2 = NULL;
|
|
|
|
|
bp->bio_pflags = 0;
|
2004-09-28 11:56:37 +00:00
|
|
|
g_io_request(bp, cp);
|
After the introduction of direct dispatch, the pacing code in g_down()
broke in two ways. One, the pacing variable was accessed in multiple
threads in an unsafe way. Two, since large numbers of I/O could come
down from the buf layer at one time, large numbers of allocation
failures could happen all at once, resulting in a huge pace value that
would limit I/Os to 10 IOPS for minutes (or even hours) at a
time. While a real solution to these problems requires substantial
work (to go to a no-allocation after the first model, or to have some
way to wait for more memory with some kind of reserve for pager and
swapper requests), it is relatively easy to make this simplistic
pacing less pathological.
Move to using a volatile variable with loads and stores. While this is
a little racy, losing the race is safe: either you get memory and
proceed, or you don't and queue. Second, sleep for 1ms (or one tick, whichever
is larger) instead of 100ms. This removes the artificial 10 IOPS limit
while still easing up on new I/Os during memory shortages. Remove
tying the amount of time we do this to the number of failed requests
and do it only as long as we keep failing requests.
Finally, to avoid needless recursion when memory is tight (start ->
g_io_deliver() -> g_io_request() -> start -> ... until we use 1/2 the
stack), don't do direct dispatch while pacing. This should be a rare
event (not steady state) so the performance hit here is worth the
extra safety of not starving g_down() with directly dispatched I/O.
Differential Review: https://reviews.freebsd.org/D3546
2015-09-02 17:29:30 +00:00
|
|
|
pace = 1;
|
2004-09-28 11:56:37 +00:00
|
|
|
return;
|
2002-03-11 21:42:35 +00:00
|
|
|
}
|
|
|
|
|
|
Implement the concept of the unmapped VMIO buffers, i.e. buffers which
do not map the b_pages pages into buffer_map KVA. The use of the
unmapped buffers eliminate the need to perform TLB shootdown for
mapping on the buffer creation and reuse, greatly reducing the amount
of IPIs for shootdown on big-SMP machines and eliminating up to 25-30%
of the system time on i/o intensive workloads.
The unmapped buffer should be explicitely requested by the GB_UNMAPPED
flag by the consumer. For unmapped buffer, no KVA reservation is
performed at all. The consumer might request unmapped buffer which
does have a KVA reserve, to manually map it without recursing into
buffer cache and blocking, with the GB_KVAALLOC flag.
When the mapped buffer is requested and unmapped buffer already
exists, the cache performs an upgrade, possibly reusing the KVA
reservation.
Unmapped buffer is translated into unmapped bio in g_vfs_strategy().
Unmapped bio carry a pointer to the vm_page_t array, offset and length
instead of the data pointer. The provider which processes the bio
should explicitely specify a readiness to accept unmapped bio,
otherwise g_down geom thread performs the transient upgrade of the bio
request by mapping the pages into the new bio_transient_map KVA
submap.
The bio_transient_map submap claims up to 10% of the buffer map, and
the total buffer_map + bio_transient_map KVA usage stays the
same. Still, it could be manually tuned by kern.bio_transient_maxcnt
tunable, in the units of the transient mappings. Eventually, the
bio_transient_map could be removed after all geom classes and drivers
can accept unmapped i/o requests.
Unmapped support can be turned off by the vfs.unmapped_buf_allowed
tunable, disabling which makes the buffer (or cluster) creation
requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped
buffers are only enabled by default on the architectures where
pmap_copy_page() was implemented and tested.
In the rework, filesystem metadata is not the subject to maxbufspace
limit anymore. Since the metadata buffers are always mapped, the
buffers still have to fit into the buffer map, which provides a
reasonable (but practically unreachable) upper bound on it. The
non-metadata buffer allocations, both mapped and unmapped, is
accounted against maxbufspace, as before. Effectively, this means that
the maxbufspace is forced on mapped and unmapped buffers separately.
The pre-patch bufspace limiting code did not worked, because
buffer_map fragmentation does not allow the limit to be reached.
By Jeff Roberson request, the getnewbuf() function was split into
smaller single-purpose functions.
Sponsored by: The FreeBSD Foundation
Discussed with: jeff (previous version)
Tested by: pho, scottl (previous version), jhb, bf
MFC after: 2 weeks
2013-03-19 14:13:12 +00:00
|
|
|
SYSCTL_DECL(_kern_geom);
|
|
|
|
|
|
|
|
|
|
static long transient_maps;
|
|
|
|
|
SYSCTL_LONG(_kern_geom, OID_AUTO, transient_maps, CTLFLAG_RD,
|
|
|
|
|
&transient_maps, 0,
|
|
|
|
|
"Total count of the transient mapping requests");
|
|
|
|
|
u_int transient_map_retries = 10;
|
|
|
|
|
SYSCTL_UINT(_kern_geom, OID_AUTO, transient_map_retries, CTLFLAG_RW,
|
|
|
|
|
&transient_map_retries, 0,
|
|
|
|
|
"Max count of retries used before giving up on creating transient map");
|
|
|
|
|
int transient_map_hard_failures;
|
|
|
|
|
SYSCTL_INT(_kern_geom, OID_AUTO, transient_map_hard_failures, CTLFLAG_RD,
|
|
|
|
|
&transient_map_hard_failures, 0,
|
|
|
|
|
"Failures to establish the transient mapping due to retry attempts "
|
|
|
|
|
"exhausted");
|
|
|
|
|
int transient_map_soft_failures;
|
|
|
|
|
SYSCTL_INT(_kern_geom, OID_AUTO, transient_map_soft_failures, CTLFLAG_RD,
|
|
|
|
|
&transient_map_soft_failures, 0,
|
|
|
|
|
"Count of retried failures to establish the transient mapping");
|
|
|
|
|
int inflight_transient_maps;
|
|
|
|
|
SYSCTL_INT(_kern_geom, OID_AUTO, inflight_transient_maps, CTLFLAG_RD,
|
|
|
|
|
&inflight_transient_maps, 0,
|
|
|
|
|
"Current count of the active transient maps");
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
g_io_transient_map_bio(struct bio *bp)
|
|
|
|
|
{
|
|
|
|
|
vm_offset_t addr;
|
|
|
|
|
long size;
|
|
|
|
|
u_int retried;
|
|
|
|
|
|
2013-03-21 07:26:33 +00:00
|
|
|
KASSERT(unmapped_buf_allowed, ("unmapped disabled"));
|
|
|
|
|
|
Implement the concept of the unmapped VMIO buffers, i.e. buffers which
do not map the b_pages pages into buffer_map KVA. The use of the
unmapped buffers eliminate the need to perform TLB shootdown for
mapping on the buffer creation and reuse, greatly reducing the amount
of IPIs for shootdown on big-SMP machines and eliminating up to 25-30%
of the system time on i/o intensive workloads.
The unmapped buffer should be explicitely requested by the GB_UNMAPPED
flag by the consumer. For unmapped buffer, no KVA reservation is
performed at all. The consumer might request unmapped buffer which
does have a KVA reserve, to manually map it without recursing into
buffer cache and blocking, with the GB_KVAALLOC flag.
When the mapped buffer is requested and unmapped buffer already
exists, the cache performs an upgrade, possibly reusing the KVA
reservation.
Unmapped buffer is translated into unmapped bio in g_vfs_strategy().
Unmapped bio carry a pointer to the vm_page_t array, offset and length
instead of the data pointer. The provider which processes the bio
should explicitely specify a readiness to accept unmapped bio,
otherwise g_down geom thread performs the transient upgrade of the bio
request by mapping the pages into the new bio_transient_map KVA
submap.
The bio_transient_map submap claims up to 10% of the buffer map, and
the total buffer_map + bio_transient_map KVA usage stays the
same. Still, it could be manually tuned by kern.bio_transient_maxcnt
tunable, in the units of the transient mappings. Eventually, the
bio_transient_map could be removed after all geom classes and drivers
can accept unmapped i/o requests.
Unmapped support can be turned off by the vfs.unmapped_buf_allowed
tunable, disabling which makes the buffer (or cluster) creation
requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped
buffers are only enabled by default on the architectures where
pmap_copy_page() was implemented and tested.
In the rework, filesystem metadata is not the subject to maxbufspace
limit anymore. Since the metadata buffers are always mapped, the
buffers still have to fit into the buffer map, which provides a
reasonable (but practically unreachable) upper bound on it. The
non-metadata buffer allocations, both mapped and unmapped, is
accounted against maxbufspace, as before. Effectively, this means that
the maxbufspace is forced on mapped and unmapped buffers separately.
The pre-patch bufspace limiting code did not worked, because
buffer_map fragmentation does not allow the limit to be reached.
By Jeff Roberson request, the getnewbuf() function was split into
smaller single-purpose functions.
Sponsored by: The FreeBSD Foundation
Discussed with: jeff (previous version)
Tested by: pho, scottl (previous version), jhb, bf
MFC after: 2 weeks
2013-03-19 14:13:12 +00:00
|
|
|
size = round_page(bp->bio_ma_offset + bp->bio_length);
|
|
|
|
|
KASSERT(size / PAGE_SIZE == bp->bio_ma_n, ("Bio too short %p", bp));
|
|
|
|
|
addr = 0;
|
|
|
|
|
retried = 0;
|
|
|
|
|
atomic_add_long(&transient_maps, 1);
|
|
|
|
|
retry:
|
2013-06-28 03:51:20 +00:00
|
|
|
if (vmem_alloc(transient_arena, size, M_BESTFIT | M_NOWAIT, &addr)) {
|
Implement the concept of the unmapped VMIO buffers, i.e. buffers which
do not map the b_pages pages into buffer_map KVA. The use of the
unmapped buffers eliminate the need to perform TLB shootdown for
mapping on the buffer creation and reuse, greatly reducing the amount
of IPIs for shootdown on big-SMP machines and eliminating up to 25-30%
of the system time on i/o intensive workloads.
The unmapped buffer should be explicitely requested by the GB_UNMAPPED
flag by the consumer. For unmapped buffer, no KVA reservation is
performed at all. The consumer might request unmapped buffer which
does have a KVA reserve, to manually map it without recursing into
buffer cache and blocking, with the GB_KVAALLOC flag.
When the mapped buffer is requested and unmapped buffer already
exists, the cache performs an upgrade, possibly reusing the KVA
reservation.
Unmapped buffer is translated into unmapped bio in g_vfs_strategy().
Unmapped bio carry a pointer to the vm_page_t array, offset and length
instead of the data pointer. The provider which processes the bio
should explicitely specify a readiness to accept unmapped bio,
otherwise g_down geom thread performs the transient upgrade of the bio
request by mapping the pages into the new bio_transient_map KVA
submap.
The bio_transient_map submap claims up to 10% of the buffer map, and
the total buffer_map + bio_transient_map KVA usage stays the
same. Still, it could be manually tuned by kern.bio_transient_maxcnt
tunable, in the units of the transient mappings. Eventually, the
bio_transient_map could be removed after all geom classes and drivers
can accept unmapped i/o requests.
Unmapped support can be turned off by the vfs.unmapped_buf_allowed
tunable, disabling which makes the buffer (or cluster) creation
requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped
buffers are only enabled by default on the architectures where
pmap_copy_page() was implemented and tested.
In the rework, filesystem metadata is not the subject to maxbufspace
limit anymore. Since the metadata buffers are always mapped, the
buffers still have to fit into the buffer map, which provides a
reasonable (but practically unreachable) upper bound on it. The
non-metadata buffer allocations, both mapped and unmapped, is
accounted against maxbufspace, as before. Effectively, this means that
the maxbufspace is forced on mapped and unmapped buffers separately.
The pre-patch bufspace limiting code did not worked, because
buffer_map fragmentation does not allow the limit to be reached.
By Jeff Roberson request, the getnewbuf() function was split into
smaller single-purpose functions.
Sponsored by: The FreeBSD Foundation
Discussed with: jeff (previous version)
Tested by: pho, scottl (previous version), jhb, bf
MFC after: 2 weeks
2013-03-19 14:13:12 +00:00
|
|
|
if (transient_map_retries != 0 &&
|
|
|
|
|
retried >= transient_map_retries) {
|
|
|
|
|
CTR2(KTR_GEOM, "g_down cannot map bp %p provider %s",
|
|
|
|
|
bp, bp->bio_to->name);
|
|
|
|
|
atomic_add_int(&transient_map_hard_failures, 1);
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
return (EDEADLK/* XXXKIB */);
|
Implement the concept of the unmapped VMIO buffers, i.e. buffers which
do not map the b_pages pages into buffer_map KVA. The use of the
unmapped buffers eliminate the need to perform TLB shootdown for
mapping on the buffer creation and reuse, greatly reducing the amount
of IPIs for shootdown on big-SMP machines and eliminating up to 25-30%
of the system time on i/o intensive workloads.
The unmapped buffer should be explicitely requested by the GB_UNMAPPED
flag by the consumer. For unmapped buffer, no KVA reservation is
performed at all. The consumer might request unmapped buffer which
does have a KVA reserve, to manually map it without recursing into
buffer cache and blocking, with the GB_KVAALLOC flag.
When the mapped buffer is requested and unmapped buffer already
exists, the cache performs an upgrade, possibly reusing the KVA
reservation.
Unmapped buffer is translated into unmapped bio in g_vfs_strategy().
Unmapped bio carry a pointer to the vm_page_t array, offset and length
instead of the data pointer. The provider which processes the bio
should explicitely specify a readiness to accept unmapped bio,
otherwise g_down geom thread performs the transient upgrade of the bio
request by mapping the pages into the new bio_transient_map KVA
submap.
The bio_transient_map submap claims up to 10% of the buffer map, and
the total buffer_map + bio_transient_map KVA usage stays the
same. Still, it could be manually tuned by kern.bio_transient_maxcnt
tunable, in the units of the transient mappings. Eventually, the
bio_transient_map could be removed after all geom classes and drivers
can accept unmapped i/o requests.
Unmapped support can be turned off by the vfs.unmapped_buf_allowed
tunable, disabling which makes the buffer (or cluster) creation
requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped
buffers are only enabled by default on the architectures where
pmap_copy_page() was implemented and tested.
In the rework, filesystem metadata is not the subject to maxbufspace
limit anymore. Since the metadata buffers are always mapped, the
buffers still have to fit into the buffer map, which provides a
reasonable (but practically unreachable) upper bound on it. The
non-metadata buffer allocations, both mapped and unmapped, is
accounted against maxbufspace, as before. Effectively, this means that
the maxbufspace is forced on mapped and unmapped buffers separately.
The pre-patch bufspace limiting code did not worked, because
buffer_map fragmentation does not allow the limit to be reached.
By Jeff Roberson request, the getnewbuf() function was split into
smaller single-purpose functions.
Sponsored by: The FreeBSD Foundation
Discussed with: jeff (previous version)
Tested by: pho, scottl (previous version), jhb, bf
MFC after: 2 weeks
2013-03-19 14:13:12 +00:00
|
|
|
} else {
|
|
|
|
|
/*
|
|
|
|
|
* Naive attempt to quisce the I/O to get more
|
|
|
|
|
* in-flight requests completed and defragment
|
2013-06-28 03:51:20 +00:00
|
|
|
* the transient_arena.
|
Implement the concept of the unmapped VMIO buffers, i.e. buffers which
do not map the b_pages pages into buffer_map KVA. The use of the
unmapped buffers eliminate the need to perform TLB shootdown for
mapping on the buffer creation and reuse, greatly reducing the amount
of IPIs for shootdown on big-SMP machines and eliminating up to 25-30%
of the system time on i/o intensive workloads.
The unmapped buffer should be explicitely requested by the GB_UNMAPPED
flag by the consumer. For unmapped buffer, no KVA reservation is
performed at all. The consumer might request unmapped buffer which
does have a KVA reserve, to manually map it without recursing into
buffer cache and blocking, with the GB_KVAALLOC flag.
When the mapped buffer is requested and unmapped buffer already
exists, the cache performs an upgrade, possibly reusing the KVA
reservation.
Unmapped buffer is translated into unmapped bio in g_vfs_strategy().
Unmapped bio carry a pointer to the vm_page_t array, offset and length
instead of the data pointer. The provider which processes the bio
should explicitely specify a readiness to accept unmapped bio,
otherwise g_down geom thread performs the transient upgrade of the bio
request by mapping the pages into the new bio_transient_map KVA
submap.
The bio_transient_map submap claims up to 10% of the buffer map, and
the total buffer_map + bio_transient_map KVA usage stays the
same. Still, it could be manually tuned by kern.bio_transient_maxcnt
tunable, in the units of the transient mappings. Eventually, the
bio_transient_map could be removed after all geom classes and drivers
can accept unmapped i/o requests.
Unmapped support can be turned off by the vfs.unmapped_buf_allowed
tunable, disabling which makes the buffer (or cluster) creation
requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped
buffers are only enabled by default on the architectures where
pmap_copy_page() was implemented and tested.
In the rework, filesystem metadata is not the subject to maxbufspace
limit anymore. Since the metadata buffers are always mapped, the
buffers still have to fit into the buffer map, which provides a
reasonable (but practically unreachable) upper bound on it. The
non-metadata buffer allocations, both mapped and unmapped, is
accounted against maxbufspace, as before. Effectively, this means that
the maxbufspace is forced on mapped and unmapped buffers separately.
The pre-patch bufspace limiting code did not worked, because
buffer_map fragmentation does not allow the limit to be reached.
By Jeff Roberson request, the getnewbuf() function was split into
smaller single-purpose functions.
Sponsored by: The FreeBSD Foundation
Discussed with: jeff (previous version)
Tested by: pho, scottl (previous version), jhb, bf
MFC after: 2 weeks
2013-03-19 14:13:12 +00:00
|
|
|
*/
|
|
|
|
|
CTR3(KTR_GEOM, "g_down retrymap bp %p provider %s r %d",
|
|
|
|
|
bp, bp->bio_to->name, retried);
|
|
|
|
|
pause("g_d_tra", hz / 10);
|
|
|
|
|
retried++;
|
|
|
|
|
atomic_add_int(&transient_map_soft_failures, 1);
|
|
|
|
|
goto retry;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
atomic_add_int(&inflight_transient_maps, 1);
|
|
|
|
|
pmap_qenter((vm_offset_t)addr, bp->bio_ma, OFF_TO_IDX(size));
|
|
|
|
|
bp->bio_data = (caddr_t)addr + bp->bio_ma_offset;
|
|
|
|
|
bp->bio_flags |= BIO_TRANSIENT_MAPPING;
|
|
|
|
|
bp->bio_flags &= ~BIO_UNMAPPED;
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
return (EJUSTRETURN);
|
Implement the concept of the unmapped VMIO buffers, i.e. buffers which
do not map the b_pages pages into buffer_map KVA. The use of the
unmapped buffers eliminate the need to perform TLB shootdown for
mapping on the buffer creation and reuse, greatly reducing the amount
of IPIs for shootdown on big-SMP machines and eliminating up to 25-30%
of the system time on i/o intensive workloads.
The unmapped buffer should be explicitely requested by the GB_UNMAPPED
flag by the consumer. For unmapped buffer, no KVA reservation is
performed at all. The consumer might request unmapped buffer which
does have a KVA reserve, to manually map it without recursing into
buffer cache and blocking, with the GB_KVAALLOC flag.
When the mapped buffer is requested and unmapped buffer already
exists, the cache performs an upgrade, possibly reusing the KVA
reservation.
Unmapped buffer is translated into unmapped bio in g_vfs_strategy().
Unmapped bio carry a pointer to the vm_page_t array, offset and length
instead of the data pointer. The provider which processes the bio
should explicitely specify a readiness to accept unmapped bio,
otherwise g_down geom thread performs the transient upgrade of the bio
request by mapping the pages into the new bio_transient_map KVA
submap.
The bio_transient_map submap claims up to 10% of the buffer map, and
the total buffer_map + bio_transient_map KVA usage stays the
same. Still, it could be manually tuned by kern.bio_transient_maxcnt
tunable, in the units of the transient mappings. Eventually, the
bio_transient_map could be removed after all geom classes and drivers
can accept unmapped i/o requests.
Unmapped support can be turned off by the vfs.unmapped_buf_allowed
tunable, disabling which makes the buffer (or cluster) creation
requests to ignore GB_UNMAPPED and GB_KVAALLOC flags. Unmapped
buffers are only enabled by default on the architectures where
pmap_copy_page() was implemented and tested.
In the rework, filesystem metadata is not the subject to maxbufspace
limit anymore. Since the metadata buffers are always mapped, the
buffers still have to fit into the buffer map, which provides a
reasonable (but practically unreachable) upper bound on it. The
non-metadata buffer allocations, both mapped and unmapped, is
accounted against maxbufspace, as before. Effectively, this means that
the maxbufspace is forced on mapped and unmapped buffers separately.
The pre-patch bufspace limiting code did not worked, because
buffer_map fragmentation does not allow the limit to be reached.
By Jeff Roberson request, the getnewbuf() function was split into
smaller single-purpose functions.
Sponsored by: The FreeBSD Foundation
Discussed with: jeff (previous version)
Tested by: pho, scottl (previous version), jhb, bf
MFC after: 2 weeks
2013-03-19 14:13:12 +00:00
|
|
|
}
|
|
|
|
|
|
2002-03-11 21:42:35 +00:00
|
|
|
void
|
|
|
|
|
g_io_schedule_down(struct thread *tp __unused)
|
|
|
|
|
{
|
|
|
|
|
struct bio *bp;
|
2003-02-06 21:01:36 +00:00
|
|
|
int error;
|
2002-03-11 21:42:35 +00:00
|
|
|
|
|
|
|
|
for(;;) {
|
2003-02-11 22:30:26 +00:00
|
|
|
g_bioq_lock(&g_bio_run_down);
|
2002-03-11 21:42:35 +00:00
|
|
|
bp = g_bioq_first(&g_bio_run_down);
|
2003-02-11 22:30:26 +00:00
|
|
|
if (bp == NULL) {
|
2004-10-21 18:35:24 +00:00
|
|
|
CTR0(KTR_GEOM, "g_down going to sleep");
|
2003-02-11 22:30:26 +00:00
|
|
|
msleep(&g_wait_down, &g_bio_run_down.bio_queue_lock,
|
2009-09-06 19:33:13 +00:00
|
|
|
PRIBIO | PDROP, "-", 0);
|
2003-02-11 22:30:26 +00:00
|
|
|
continue;
|
|
|
|
|
}
|
2004-10-21 18:35:24 +00:00
|
|
|
CTR0(KTR_GEOM, "g_down has work to do");
|
2003-02-11 22:30:26 +00:00
|
|
|
g_bioq_unlock(&g_bio_run_down);
|
After the introduction of direct dispatch, the pacing code in g_down()
broke in two ways. One, the pacing variable was accessed in multiple
threads in an unsafe way. Two, since large numbers of I/O could come
down from the buf layer at one time, large numbers of allocation
failures could happen all at once, resulting in a huge pace value that
would limit I/Os to 10 IOPS for minutes (or even hours) at a
time. While a real solution to these problems requires substantial
work (to go to a no-allocation after the first model, or to have some
way to wait for more memory with some kind of reserve for pager and
swapper requests), it is relatively easy to make this simplistic
pacing less pathological.
Move to using a volatile variable with loads and stores. While this is
a little racy, losing the race is safe: either you get memory and
proceed, or you don't and queue. Second, sleep for 1ms (or one tick, whichever
is larger) instead of 100ms. This removes the artificial 10 IOPS limit
while still easing up on new I/Os during memory shortages. Remove
tying the amount of time we do this to the number of failed requests
and do it only as long as we keep failing requests.
Finally, to avoid needless recursion when memory is tight (start ->
g_io_deliver() -> g_io_request() -> start -> ... until we use 1/2 the
stack), don't do direct dispatch while pacing. This should be a rare
event (not steady state) so the performance hit here is worth the
extra safety of not starving g_down() with directly dispatched I/O.
Differential Review: https://reviews.freebsd.org/D3546
2015-09-02 17:29:30 +00:00
|
|
|
if (pace != 0) {
|
|
|
|
|
/*
|
|
|
|
|
* There has been at least one memory allocation
|
|
|
|
|
* failure since the last I/O completed. Pause 1ms to
|
|
|
|
|
* give the system a chance to free up memory. We only
|
|
|
|
|
* do this once because a large number of allocations
|
|
|
|
|
* can fail in the direct dispatch case and there's no
|
|
|
|
|
* relationship between the number of these failures and
|
|
|
|
|
* the length of the outage. If there's still an outage,
|
|
|
|
|
* we'll pause again and again until it's
|
|
|
|
|
* resolved. Older versions paused longer and once per
|
|
|
|
|
* allocation failure. This was OK for a single threaded
|
|
|
|
|
* g_down, but with direct dispatch would lead to max of
|
|
|
|
|
* 10 IOPs for minutes at a time when transient memory
|
|
|
|
|
* issues prevented allocation for a batch of requests
|
|
|
|
|
* from the upper layers.
|
|
|
|
|
*
|
|
|
|
|
* XXX This pacing is really lame. It needs to be solved
|
|
|
|
|
* by other methods. This is OK only because the worst
|
|
|
|
|
* case scenario is so rare. In the worst case scenario
|
|
|
|
|
* all memory is tied up waiting for I/O to complete
|
|
|
|
|
* which can never happen since we can't allocate bios
|
|
|
|
|
* for that I/O.
|
|
|
|
|
*/
|
|
|
|
|
CTR0(KTR_GEOM, "g_down pacing self");
|
|
|
|
|
pause("g_down", min(hz/1000, 1));
|
|
|
|
|
pace = 0;
|
2003-03-29 22:34:37 +00:00
|
|
|
}
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
CTR2(KTR_GEOM, "g_down processing bp %p provider %s", bp,
|
|
|
|
|
bp->bio_to->name);
|
2003-02-06 21:01:36 +00:00
|
|
|
error = g_io_check(bp);
|
Merge GEOM direct dispatch changes from the projects/camlock branch.
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.
The defined now safety requirements are:
- caller should not hold any locks and should be reenterable;
- callee should not depend on GEOM dual-threaded concurency semantics;
- on the way down, if request is unmapped while callee doesn't support it,
the context should be sleepable;
- kernel thread stack usage should be below 50%.
To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
- G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
- G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
- G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
- G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe. If any of requirements are not met, request is queued to
g_up or g_down thread same as before.
Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).
To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.
This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).
Sponsored by: iXsystems, Inc.
MFC after: 2 months
2013-10-22 08:22:19 +00:00
|
|
|
if (error >= 0) {
|
2004-10-21 18:35:24 +00:00
|
|
|
CTR3(KTR_GEOM, "g_down g_io_check on bp %p provider "
|
|
|
|
|
"%s returned %d", bp, bp->bio_to->name, error);
|
2003-02-06 21:01:36 +00:00
|
|
|
g_io_deliver(bp, error);
|
|
|
|
|
continue;
|
|
|
|
|
}
|
2005-09-15 19:05:37 +00:00
|
|
|
THREAD_NO_SLEEPING();
|
2004-10-21 18:35:24 +00:00
|
|
|
CTR4(KTR_GEOM, "g_down starting bp %p provider %s off %ld "
|
|
|
|
|
"len %ld", bp, bp->bio_to->name, bp->bio_offset,
|
|
|
|
|
bp->bio_length);
|
2002-03-11 21:42:35 +00:00
|
|
|
bp->bio_to->geom->start(bp);
|
2005-09-15 19:05:37 +00:00
|
|
|
THREAD_SLEEPING_OK();
|
2002-03-11 21:42:35 +00:00
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2004-01-28 08:39:18 +00:00
|
|
|
void
|
|
|
|
|
bio_taskqueue(struct bio *bp, bio_task_t *func, void *arg)
|
|
|
|
|
{
|
|
|
|
|
bp->bio_task = func;
|
|
|
|
|
bp->bio_task_arg = arg;
|
|
|
|
|
/*
|
|
|
|
|
* The taskqueue is actually just a second queue off the "up"
|
|
|
|
|
* queue, so we use the same lock.
|
|
|
|
|
*/
|
|
|
|
|
g_bioq_lock(&g_bio_run_up);
|
2004-08-30 09:33:06 +00:00
|
|
|
KASSERT(!(bp->bio_flags & BIO_ONQUEUE),
|
|
|
|
|
("Bio already on queue bp=%p target taskq", bp));
|
|
|
|
|
bp->bio_flags |= BIO_ONQUEUE;
|
2004-01-28 08:39:18 +00:00
|
|
|
TAILQ_INSERT_TAIL(&g_bio_run_task.bio_queue, bp, bio_queue);
|
|
|
|
|
g_bio_run_task.bio_queue_length++;
|
|
|
|
|
wakeup(&g_wait_up);
|
|
|
|
|
g_bioq_unlock(&g_bio_run_up);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
2002-03-11 21:42:35 +00:00
|
|
|
void
|
|
|
|
|
g_io_schedule_up(struct thread *tp __unused)
|
|
|
|
|
{
|
|
|
|
|
struct bio *bp;
|
|
|
|
|
for(;;) {
|
2003-02-11 22:30:26 +00:00
|
|
|
g_bioq_lock(&g_bio_run_up);
|
2004-01-28 08:39:18 +00:00
|
|
|
bp = g_bioq_first(&g_bio_run_task);
|
|
|
|
|
if (bp != NULL) {
|
|
|
|
|
g_bioq_unlock(&g_bio_run_up);
|
2005-09-15 19:05:37 +00:00
|
|
|
THREAD_NO_SLEEPING();
|
2004-10-21 18:35:24 +00:00
|
|
|
CTR1(KTR_GEOM, "g_up processing task bp %p", bp);
|
2004-01-28 08:39:18 +00:00
|
|
|
bp->bio_task(bp->bio_task_arg);
|
2005-09-15 19:05:37 +00:00
|
|
|
THREAD_SLEEPING_OK();
|
2004-01-28 08:39:18 +00:00
|
|
|
continue;
|
|
|
|
|
}
|
2002-03-11 21:42:35 +00:00
|
|
|
bp = g_bioq_first(&g_bio_run_up);
|
2003-02-11 22:30:26 +00:00
|
|
|
if (bp != NULL) {
|
|
|
|
|
g_bioq_unlock(&g_bio_run_up);
|
2005-09-15 19:05:37 +00:00
|
|
|
THREAD_NO_SLEEPING();
|
2004-10-21 18:35:24 +00:00
|
|
|
CTR4(KTR_GEOM, "g_up biodone bp %p provider %s off "
|
2008-09-18 15:02:19 +00:00
|
|
|
"%jd len %ld", bp, bp->bio_to->name,
|
2004-10-21 18:35:24 +00:00
|
|
|
bp->bio_offset, bp->bio_length);
|
2003-02-11 22:30:26 +00:00
|
|
|
biodone(bp);
|
2005-09-15 19:05:37 +00:00
|
|
|
THREAD_SLEEPING_OK();
|
2003-02-11 22:30:26 +00:00
|
|
|
continue;
|
|
|
|
|
}
|
2004-10-21 18:35:24 +00:00
|
|
|
CTR0(KTR_GEOM, "g_up going to sleep");
|
2003-02-11 22:30:26 +00:00
|
|
|
msleep(&g_wait_up, &g_bio_run_up.bio_queue_lock,
|
2009-09-06 19:33:13 +00:00
|
|
|
PRIBIO | PDROP, "-", 0);
|
2002-03-11 21:42:35 +00:00
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void *
|
|
|
|
|
g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error)
|
|
|
|
|
{
|
|
|
|
|
struct bio *bp;
|
|
|
|
|
void *ptr;
|
|
|
|
|
int errorc;
|
|
|
|
|
|
2004-09-28 08:34:27 +00:00
|
|
|
KASSERT(length > 0 && length >= cp->provider->sectorsize &&
|
|
|
|
|
length <= MAXPHYS, ("g_read_data(): invalid length %jd",
|
|
|
|
|
(intmax_t)length));
|
2003-09-26 20:52:46 +00:00
|
|
|
|
2004-08-27 14:43:11 +00:00
|
|
|
bp = g_alloc_bio();
|
2002-10-08 07:03:58 +00:00
|
|
|
bp->bio_cmd = BIO_READ;
|
|
|
|
|
bp->bio_done = NULL;
|
|
|
|
|
bp->bio_offset = offset;
|
|
|
|
|
bp->bio_length = length;
|
2003-02-19 05:47:46 +00:00
|
|
|
ptr = g_malloc(length, M_WAITOK);
|
2002-10-08 07:03:58 +00:00
|
|
|
bp->bio_data = ptr;
|
|
|
|
|
g_io_request(bp, cp);
|
|
|
|
|
errorc = biowait(bp, "gread");
|
|
|
|
|
if (error != NULL)
|
|
|
|
|
*error = errorc;
|
|
|
|
|
g_destroy_bio(bp);
|
|
|
|
|
if (errorc) {
|
|
|
|
|
g_free(ptr);
|
|
|
|
|
ptr = NULL;
|
|
|
|
|
}
|
2002-03-11 21:42:35 +00:00
|
|
|
return (ptr);
|
|
|
|
|
}
|
2002-09-30 08:50:47 +00:00
|
|
|
|
|
|
|
|
int
|
|
|
|
|
g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length)
|
|
|
|
|
{
|
|
|
|
|
struct bio *bp;
|
|
|
|
|
int error;
|
|
|
|
|
|
2004-09-28 08:34:27 +00:00
|
|
|
KASSERT(length > 0 && length >= cp->provider->sectorsize &&
|
|
|
|
|
length <= MAXPHYS, ("g_write_data(): invalid length %jd",
|
|
|
|
|
(intmax_t)length));
|
2003-09-26 20:52:46 +00:00
|
|
|
|
2004-08-27 14:43:11 +00:00
|
|
|
bp = g_alloc_bio();
|
2002-09-30 08:50:47 +00:00
|
|
|
bp->bio_cmd = BIO_WRITE;
|
|
|
|
|
bp->bio_done = NULL;
|
|
|
|
|
bp->bio_offset = offset;
|
|
|
|
|
bp->bio_length = length;
|
|
|
|
|
bp->bio_data = ptr;
|
|
|
|
|
g_io_request(bp, cp);
|
|
|
|
|
error = biowait(bp, "gwrite");
|
|
|
|
|
g_destroy_bio(bp);
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
2004-02-11 18:21:32 +00:00
|
|
|
|
2007-05-05 16:35:22 +00:00
|
|
|
int
|
|
|
|
|
g_delete_data(struct g_consumer *cp, off_t offset, off_t length)
|
|
|
|
|
{
|
|
|
|
|
struct bio *bp;
|
|
|
|
|
int error;
|
|
|
|
|
|
2007-12-16 18:03:31 +00:00
|
|
|
KASSERT(length > 0 && length >= cp->provider->sectorsize,
|
|
|
|
|
("g_delete_data(): invalid length %jd", (intmax_t)length));
|
2007-05-05 16:35:22 +00:00
|
|
|
|
|
|
|
|
bp = g_alloc_bio();
|
|
|
|
|
bp->bio_cmd = BIO_DELETE;
|
|
|
|
|
bp->bio_done = NULL;
|
|
|
|
|
bp->bio_offset = offset;
|
|
|
|
|
bp->bio_length = length;
|
|
|
|
|
bp->bio_data = NULL;
|
|
|
|
|
g_io_request(bp, cp);
|
|
|
|
|
error = biowait(bp, "gdelete");
|
|
|
|
|
g_destroy_bio(bp);
|
|
|
|
|
return (error);
|
|
|
|
|
}
|
|
|
|
|
|
2004-02-11 18:21:32 +00:00
|
|
|
void
|
|
|
|
|
g_print_bio(struct bio *bp)
|
|
|
|
|
{
|
|
|
|
|
const char *pname, *cmd = NULL;
|
|
|
|
|
|
|
|
|
|
if (bp->bio_to != NULL)
|
|
|
|
|
pname = bp->bio_to->name;
|
|
|
|
|
else
|
|
|
|
|
pname = "[unknown]";
|
|
|
|
|
|
|
|
|
|
switch (bp->bio_cmd) {
|
|
|
|
|
case BIO_GETATTR:
|
|
|
|
|
cmd = "GETATTR";
|
|
|
|
|
printf("%s[%s(attr=%s)]", pname, cmd, bp->bio_attribute);
|
|
|
|
|
return;
|
2006-10-31 21:11:21 +00:00
|
|
|
case BIO_FLUSH:
|
|
|
|
|
cmd = "FLUSH";
|
|
|
|
|
printf("%s[%s]", pname, cmd);
|
|
|
|
|
return;
|
2004-02-11 18:21:32 +00:00
|
|
|
case BIO_READ:
|
|
|
|
|
cmd = "READ";
|
2010-06-10 17:49:36 +00:00
|
|
|
break;
|
2004-02-11 18:21:32 +00:00
|
|
|
case BIO_WRITE:
|
2010-06-10 17:49:36 +00:00
|
|
|
cmd = "WRITE";
|
|
|
|
|
break;
|
2004-02-11 18:21:32 +00:00
|
|
|
case BIO_DELETE:
|
2010-06-10 17:49:36 +00:00
|
|
|
cmd = "DELETE";
|
|
|
|
|
break;
|
2004-02-11 18:21:32 +00:00
|
|
|
default:
|
|
|
|
|
cmd = "UNKNOWN";
|
|
|
|
|
printf("%s[%s()]", pname, cmd);
|
|
|
|
|
return;
|
|
|
|
|
}
|
2010-06-10 17:49:36 +00:00
|
|
|
printf("%s[%s(offset=%jd, length=%jd)]", pname, cmd,
|
|
|
|
|
(intmax_t)bp->bio_offset, (intmax_t)bp->bio_length);
|
2004-02-11 18:21:32 +00:00
|
|
|
}
|