1
0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-24 11:29:10 +00:00
Commit Graph

222 Commits

Author SHA1 Message Date
Poul-Henning Kamp
395714feb7 Eliminate unnecessary udev_t variable: we can derive it from the dev_t
when we need it.
2003-08-15 13:14:25 +00:00
Poul-Henning Kamp
89dc784fa3 Make swaponvp() static to the swap_pager. 2003-08-15 12:04:29 +00:00
Poul-Henning Kamp
ef3c5abdba Make the first two pages magic to protect the BSD labels rather than
only one.
2003-08-06 14:13:38 +00:00
Poul-Henning Kamp
751221fd32 Staticize swap_pager_putpages()
Eliminate a lot of checkes to make sure requests are not cross-device
which is unnecessary with the new layout.  We know a sequential request
cannot possibly be cross-device because there is a reserved page between
the devices.

Remove a couple of comments which no longer are relevant.
2003-08-06 12:08:27 +00:00
Poul-Henning Kamp
5e04322a6e Explicitly set B_PAGING 2003-08-06 09:22:47 +00:00
Poul-Henning Kamp
c37a77ee86 Rip out the totally bogos vnode swapdev_vp with extreeme prejudice.
Don't mark buffers with B_KEEPGIANT, we don't drop giant in strategy
at this point in time.
2003-08-06 06:53:31 +00:00
Poul-Henning Kamp
e04e4bacf6 Use sparse struct initialization for struct pagerops.
Mark our buffers B_KEEPGIANT before sending them downstream.

Remove swap_pager_strategy implementation.
2003-08-05 06:54:56 +00:00
Poul-Henning Kamp
665c0caf03 Put an uncovered page between the swap devices, that way we can be sure
to not get any cross-device I/O requests.  (The unallocated first page
protecting BSD labels already gave us this, but that hack may go away
at some point in time).

Remove the check for cross-device I/O requests in swap_pager_strategy.

Move the repeated statistics updating into flushchainbuf().
2003-08-04 08:22:49 +00:00
Poul-Henning Kamp
12692209a6 Name swap_pager_find_dev() more correctly swp_pager_finde_dev().
Use ->bio_children to count child buffers, rather than abuse the
bio_caller1 pointer.

Expand the relevant bits of waitchainbuf() inline, this clarifies
the code a little bit.
2003-08-03 21:22:42 +00:00
Poul-Henning Kamp
5ff0108d21 I accidentally hit undo before committing, fix the resulting off-by-one. 2003-08-03 14:53:52 +00:00
Poul-Henning Kamp
8f60c087e6 Change the layout policy of the swap_pager from a hardcoded width
striping to a per device round-robin algorithm.

Because of the policy of not attempting to retain previous swap
allocation on page-out, this means that a newly added swap device
almost instantly takes its 1/N share of the I/O load but it takes
somewhat longer for it to assume it's 1/N share of the pages if there
is plenty of space on the other devices.

Change the 8G total swapspace limitation to 8G per device instead
by using a per device blist rather than one global blist.  This
reduces the memory footprint by 75% (typically a couple hundred
kilobytes) for the common case with one swapdevice but NSWAPDEV=4.

Remove the compile time constant limit of number of swap devices,
there is no limit now.  Instead of a fixed size array, store the
per swapdev structure in a TAILQ.

Total swap space is still addressed by a 32 bit page number and
therefore the upper limit is now 2^42 bytes = 16TB (for i386).

We still do not allocate the first page of each device in order to
give some amount of protection to any bsdlabel at the start of the
device.

A new device is appended after the existing devices in the swap space,
no attempt is made to fill in holes left behind by swapoff (this can
trivially be changed should it ever become a problem).

The sysctl vm.nswapdev now reflects the number of currently configured
swap devices.

Rename vm_swap_size to swap_pager_avail for consistency with other
exported names.

Change argument type for vm_proc_swapin_all() and swap_pager_isswapped()
to be a struct swdevt pointer rather than an index.

Not changed: we are still using blists to manage the free space,
but since the swapspace is no longer fragmented by the striping
different resource managers might fare better.
2003-08-03 13:35:31 +00:00
Poul-Henning Kamp
8d677ef93f Remove unused stuff.
Move used stuff to swap_pager.c where it belongs.

This file no longer exports anything to userland.
2003-07-31 22:19:28 +00:00
Poul-Henning Kamp
a8d43c90af Add a "int fd" argument to VOP_OPEN() which in the future will
contain the filedescriptor number on opens from userland.

The index is used rather than a "struct file *" since it conveys a bit
more information, which may be useful to in particular fdescfs and /dev/fd/*

For now pass -1 all over the place.
2003-07-26 07:32:23 +00:00
Poul-Henning Kamp
a5edd34afe Remove all but one of the inlines here, this reduces the code size by
2032 bytes and has no measurable impact on performance.
2003-07-22 20:54:26 +00:00
Peter Wemm
da5fd14534 swp_pager_hash() was called before it was instantiated inline. This made
gcc (quite rightly) unhappy.  Move it earlier.
2003-07-22 06:55:48 +00:00
Poul-Henning Kamp
85fdafb98d Fix a printf format warning I introduced.
Use the macro max number of swap devices rather than cache the constant
in a variable.
Avoid a (now) pointless variable.
2003-07-18 22:11:17 +00:00
Poul-Henning Kamp
d3dd89ab11 If a proposed swap device exceeds the 8G artificial limit which out
radix-tree code imposes, truncate the device instead of rejecting it.
2003-07-18 11:01:23 +00:00
Poul-Henning Kamp
ec38b344cb Move the implementation of the vmspace_swap_count() (used only in
the "toss the largest process" emergency handling) from vm_map.c to
swap_pager.c.

The quantity calculated depends strongly on the internals of the
swap_pager and by moving it, we no longer need to expose the
internal metrics of the swap_pager to the world.
2003-07-18 10:47:58 +00:00
Poul-Henning Kamp
567104a148 Add a new function swap_pager_status() which reports the total size of the
paging space and how much of it is in use (in pages).

Use this interface from the Linuxolator instead of groping around in the
internals of the swap_pager.
2003-07-18 10:26:09 +00:00
Poul-Henning Kamp
e9c0cc157b Merge swap_pager.c and vm_swap.c into swap_pager.c, the separation
is not natural and needlessly exposes a lot of dirty laundry.

Move private interfaces between the two from swap_pager.h to swap_pager.c
and staticize as much as possible.

No functional change.
2003-07-18 10:02:44 +00:00
Poul-Henning Kamp
116b3c2af9 Make sure that SWP_NPAGES always has the same value in all source
files, so that SWAP_META_PAGES does not vary either.

swap_pager.c ended up with a value of 16, everybody else 8.  Go with
the 16 for now.

This should only have any effect in the "kill processes because we
are out of swap" scenario, where it will make some sort of estimate
of something more precise.
2003-07-17 21:58:43 +00:00
Alan Cox
dd5e55f872 Maintain the lock on a vm object when calling vm_page_grab(). 2003-06-25 04:53:56 +00:00
Alan Cox
5ea4972cd4 Make swap_pager_haspages() static; remove unused function prototypes. 2003-06-20 20:20:06 +00:00
Poul-Henning Kamp
b94b853bf1 This file was ignored by CVS in my last commit for some reason:
Remove pointless initialization of b_spc field, which now no longer
exists.
2003-06-16 09:31:15 +00:00
Alan Cox
33a609ece0 Extend the scope of the vm object lock in swp_pager_async_iodone() to cover
a vm_page_free().
2003-06-13 06:17:42 +00:00
Alan Cox
8630c1173e Add vm object locking to various pagers' "get pages" methods, i386 stack
management functions, and a u area management function.
2003-06-13 03:02:28 +00:00
David E. O'Brien
874651b13c Use __FBSDID(). 2003-06-11 23:50:51 +00:00
Alan Cox
19ba4c8e49 Assert that the vm object is locked on entry to swap_pager_freespace(). 2003-06-07 20:43:16 +00:00
Alan Cox
658ad5fff5 Lock the vm_object when performing vm_pager_deallocate(). 2003-05-06 02:45:28 +00:00
Alan Cox
17cd3642fe - Lock the vm_object when performing swap_pager_isswapped().
- Assert that the vm_object is locked in swap_pager_isswapped().
2003-04-28 17:13:53 +00:00
Alan Cox
1ca5895341 - Convert vm_object_pip_wait() from using tsleep() to msleep().
- Make vm_object_pip_sleep() static.
 - Lock the vm_object when performing vm_object_pip_wait().
2003-04-26 18:33:18 +00:00
Alan Cox
d68d828b43 - Lock the vm_object when performing vm_object_pip_add().
- Remove an unnecessary variable.
2003-04-20 07:08:30 +00:00
Alan Cox
d22bc7101c - Lock the vm_object when performing vm_object_pip_add(). 2003-04-20 03:41:21 +00:00
Alan Cox
0fa05eae77 - Lock the vm_object when performing vm_object_pip_subtract().
- Assert that the vm_object lock is held in vm_object_pip_subtract().
2003-04-19 22:11:41 +00:00
Alan Cox
0d420ad3e6 - Lock the vm_object when performing vm_object_pip_wakeupn().
- Assert that the vm_object lock is held in vm_object_pip_wakeupn().
 - Add a new macro VM_OBJECT_LOCK_ASSERT().
2003-04-19 21:15:44 +00:00
Warner Losh
a163d034fa Back out M_* changes, per decision of the TRB.
Approved by: trb
2003-02-19 05:47:46 +00:00
Alfred Perlstein
44956c9863 Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.
2003-01-21 08:56:16 +00:00
Poul-Henning Kamp
c410df597b Avoid extern decls in .c files by putting them in the vm/swap_pager.h
include file where they belong.
Share the dmmax_mask variable.
2003-01-03 14:30:46 +00:00
Poul-Henning Kamp
862702306b Convert calls to BUF_STRATEGY to VOP_STRATEGY calls. This is a no-op since
all BUF_STRATEGY did in the first place was call VOP_STRATEGY.
2003-01-03 06:32:15 +00:00
Alan Cox
b365ea9e30 Hold the page queues lock when performing vm_page_flag_set(). 2002-12-18 04:02:02 +00:00
Matthew Dillon
92da00bb24 This is David Schultz's swapoff code which I am finally able to commit.
This should be considered highly experimental for the moment.

Submitted by:	David Schultz <dschultz@uclink.Berkeley.EDU>
MFC after:	3 weeks
2002-12-15 19:17:57 +00:00
Alan Cox
a12cc0e489 Remove vm_page_protect(). Instead, use pmap_page_protect() directly. 2002-11-18 04:05:22 +00:00
Olivier Houchard
f64e99baa2 Remove extra #include<sys/vmmeter.h>. 2002-11-11 13:57:50 +00:00
Poul-Henning Kamp
37c841831f Be consistent about "static" functions: if the function is marked
static in its prototype, mark it static at the definition too.

Inspired by:    FlexeLint warning #512
2002-09-28 17:15:38 +00:00
Jeff Roberson
6a2eac8acc - Lock access to numoutput on the swap devices. 2002-09-25 01:24:17 +00:00
Matthew Dillon
ec61f55d42 Reduce the maximum KVA reserved for swap meta structures from 70 to 32 MB.
Reduce the swap meta calculation by a factor of 2, it's still massive overkill.

X-MFC after: immediately
2002-08-31 21:15:29 +00:00
Alan Cox
ab9abe5d7e o Lock page queue accesses by vm_page_free(). 2002-07-21 20:38:45 +00:00
Alan Cox
40eab1e944 o Lock page queue accesses by vm_page_try_to_cache(). (The accesses
in kern/vfs_bio.c are already locked.)
 o Assert that the page queues lock is held in vm_page_try_to_cache().
2002-07-20 20:58:46 +00:00
Ian Dowse
23f09d50bb Avoid using the 64-bit vm_pindex_t in a few places where 64-bit
types are not required, as the overhead is unnecessary:

 o In the i386 pmap_protect(), `sindex' and `eindex' represent page
   indices within the 32-bit virtual address space.
 o In swp_pager_meta_build() and swp_pager_meta_ctl(), use a temporary
   variable to store the low few bits of a vm_pindex_t that gets used
   as an array index.
 o vm_uiomove() uses `osize' and `idx' for page offsets within a
   map entry.
 o In vm_object_split(), `idx' is a page offset within a map entry.
2002-06-26 20:32:51 +00:00
Ian Dowse
5125fe4f45 Use an explicit cast to avoid relying on sign extension to do the
right thing in code such as `vm_pindex_t x = ~SWAP_META_MASK'.

Reviewed by:	dillon
2002-06-26 19:18:14 +00:00