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Commit Graph

204 Commits

Author SHA1 Message Date
David Greenman
6306c897b5 swapout_threads() -> swapout_procs(). 1995-07-10 08:53:22 +00:00
David Greenman
f2daac0c69 Increased global RSS limit to total RAM. 1995-07-10 08:48:58 +00:00
David Greenman
06cb725951 Moved call to VOP_GETATTR() out of vnode_pager_alloc() and into the places
that call vnode_pager_alloc() so that a failure return can be dealt with.
This fixes a panic seen on NFS clients when a file being opened is deleted
on the server before the open completes.
1995-07-09 06:58:03 +00:00
David Greenman
39d38f93e2 Fixed an object allocation race condition that was causing a "object
deallocated too many times" panic when using NFS.

Reviewed by:	John Dyson
1995-07-06 11:48:48 +00:00
David Greenman
aa2cabb958 1) Converted v_vmdata to v_object.
2) Removed unnecessary vm_object_lookup()/pager_cache(object, TRUE) pairs
   after vnode_pager_alloc() calls - the object is already guaranteed to be
   persistent.
3) Removed some gratuitous casts.
1995-06-28 12:01:13 +00:00
Rodney W. Grimes
d3628763db Merge RELENG_2_0_5 into HEAD 1995-06-11 19:33:05 +00:00
Rodney W. Grimes
9b2e535452 Remove trailing whitespace. 1995-05-30 08:16:23 +00:00
David Greenman
956e9ca5a0 Removed check for sw_dev == NODEV; this is a normal condition for swap
over NFS and was gratuitously panicing when it happens.

Reviewed by:	John Dyson
Submitted by:	Pierre Beyssac via Poul-Henning Kamp
1995-05-25 03:38:11 +00:00
David Greenman
61f5d51062 Changes to fix the following bugs:
1) Files weren't properly synced on filesystems other than UFS. In some
   cases, this lead to lost data. Most likely would be noticed on NFS.
   The fix is to make the VM page sync/object_clean general rather than
   in each filesystem.
2) Mixing regular and mmaped file I/O on NFS was very broken. It caused
   chunks of files to end up as zeroes rather than the intended contents.
   The fix was to fix several race conditions and to kludge up the
   "b_dirtyoff" and "b_dirtyend" that NFS relies upon - paying attention
   to page modifications that occurred via the mmapping.

Reviewed by:	David Greenman
Submitted by:	John Dyson
1995-05-21 21:39:31 +00:00
David Greenman
2976b7f19f NFS diskless operation was broken because swapdev_vp wasn't initialized.
These changes solve the problem in a general way by moving the
initialization out of the individual fs_mountroot's and into swaponvp().

Submitted by:	Poul-Henning Kamp
1995-05-19 03:27:08 +00:00
David Greenman
0e5b52868f Fixed a bug that managed to slip in during Poul's dynamic swap partition
changes. The check for nswap was bogus, but the code was so convoluted
that it was difficult to tell. It's better now. :-)

Reviewed by:	David Greenman (extensively), and John Dyson
Submitted by:	Poul-Henning Kamp, w/tweaks by me.
1995-05-18 05:09:54 +00:00
David Greenman
5f55e84104 Accessing pages beyond the end of a mapped file results in internal
inconsistencies in the VM system that eventually lead to a panic. These
changes fix the behavior to conform to the behavior in SunOS, which is
to deny faults to pages beyond the EOF (returning SIGBUS). Internally,
this is implemented by requiring faults to be within the object size
boundaries. These changes exposed another bug, namely that passing in
an offset to mmap when trying to map an unnamed anonymous region also
results in internal inconsistencies. In this case, the offset is forced
to zero.

Reviewed by:	John Dyson and others
1995-05-18 02:59:26 +00:00
David Greenman
a401ebbe32 Changed swap partition handling/allocation so that it doesn't
require specific partitions be mentioned in the kernel config
file ("swap on foo" is now obsolete).

From Poul-Henning:

The visible effect is this:

As default, unless
        options "NSWAPDEV=23"
is in your config, you will have four swap-devices.
You can swapon(2) any block device you feel like, it doesn't have
to be in the kernel config.

There is a performance/resource win available by getting the NSWAPDEV right
(but only if you have just one swap-device ??), but using that as default
would be too restrictive.

The invisible effect is that:

Swap-handling disappears from the $arch part of the kernel.
It gets a lot simpler (-145 lines) and cleaner.

Reviewed by:	John Dyson, David Greenman
Submitted by:	Poul-Henning Kamp, with minor changes by me.
1995-05-14 03:00:10 +00:00
Poul-Henning Kamp
8af2296bcb I'm about to jump on the swap-initialization, and having talked
with davidg about it, I hereby kill two undocumented misfeatures:
The code to skip a miniroot in the swapdev is not particular useful, and
if we need it we need it to be done properly, ie size the fs and skip all
of it not some hardcoded size, and subtract what we skip from the length
in the first place.
The SEQSWAP dies too.  It's not the way to do it, it doesn't work, and
nobody have expressed any great desire for it to work.  The way to
implement it correctly would be a second argument to swapon(2) to give
a priority/policy information.  Low priority swapdevs can be made so
by adding them at a far offset (0x80000000 kind of thing), with almost no
modification to the strategy routine (in particular a offset per swapdev).
But until the need is obvious, it will not be done.
1995-05-12 03:54:59 +00:00
David Greenman
ee3a64c992 Changed "handle" from type caddr_t to void *; "handle" is several different
types of pointers, and "char *" is a bad choice for the type.
1995-05-10 18:56:09 +00:00
John Dyson
11fda60b40 Another error in the correction for trimming swap allocation for
small objects.  (This code needs to be revisited.)
1995-05-07 06:36:59 +00:00
John Dyson
85b67b98fd Fixed a calculation that would once-in-a-while cause the swap_pager
to emit spurious page outside of object type messages.  It is not
a fatal condition anyway, so the message will be omitted for
release.  Also, the code that "clips" the allocation size, associated
with the above problem, was fixed.
1995-05-07 03:48:54 +00:00
David Greenman
f325917a65 Changed object hash list to be a list rather than a tailq. This saves
space for the hash list buckets and is a little faster. The features
of tailq aren't needed. Increased the size of the object hash table
to improve performance. In the future, this will be changed so that
the table is sized dynamically.
1995-05-02 05:57:11 +00:00
David Greenman
3fc3004e03 Fixed a "bswbuf" hang caused by the wakeup in relpbuf() waking up the
wrong thing.
1995-04-25 06:22:47 +00:00
Bruce Evans
7666fb4753 inline -> __inline.
Headers should always use `__inline' for inline functions to avoid
syntax errors when modules that don't even use the offending functions
are compiled with `gcc -ansi'.
1995-04-23 08:05:49 +00:00
John Dyson
7e15fd2757 Fixed a problem in _vm_object_page_clean that could cause an
infinite loop.
1995-04-21 02:48:40 +00:00
David Greenman
aba8f38eb9 New flag: B_PAGING. Added as part of the vn driver hack. 1995-04-19 10:32:11 +00:00
David Greenman
4c1f8ee9b8 Fixed a logic bug that caused the vmdaemon to not wake up when intended.
Submitted by:	John Dyson
1995-04-17 10:00:55 +00:00
David Greenman
7c0414d074 Removed obsolete/unused variable declarations. Killed externs and included
appropriate include files.
1995-04-16 14:12:15 +00:00
David Greenman
64abb5a522 Removed obsolete/unused variable declarations.
Removed some extern declarations and included the correct include files.
1995-04-16 13:58:42 +00:00
David Greenman
c3cb3e12f5 Moved some zero-initialized variables into .bss. Made code intended to be
called only from DDB #ifdef DDB. Removed some completely unused globals.
1995-04-16 12:56:22 +00:00
David Greenman
8c3d9c403c Removed gratuitous m->blah=0 assignments when initializing the vm_page
structs in vm_page_startup(). The vm_page structs are already completely
zeroed.
1995-04-16 11:50:45 +00:00
David Greenman
2fdccd5e8c Make "print_page_info" #ifdef DDB. 1995-04-16 09:59:16 +00:00
David Greenman
ec4f9fb0ee Fixed a few bugs in vm_object_page_clean, mostly related to not syncing
pages that are in FS buffers. This fixes the (believed to already have been
fixed) problem with msync() not doing it's job...in other words, the
stuff that Andrew has continuously been complaining about.

Submitted by:	John Dyson, w/minor changes by me.
1995-04-16 03:11:28 +00:00
David Greenman
f6b04d2bfb Changes from John Dyson and myself:
Fixed remaining known bugs in the buffer IO and VM system.

vfs_bio.c:
Fixed some race conditions and locking bugs. Improved performance
by removing some (now) unnecessary code and fixing some broken
logic.
Fixed process accounting of # of FS outputs.
Properly handle NFS interrupts (B_EINTR).

(various)
Replaced calls to clrbuf() with calls to an optimized routine
called vfs_bio_clrbuf().

(various FS sync)
Sync out modified vnode_pager backed pages.

ffs_vnops.c:
Do two passes: Sync out file data first, then indirect blocks.

vm_fault.c:
Fixed deadly embrace caused by acquiring locks in the wrong order.

vnode_pager.c:
Changed to use buffer I/O system for writing out modified pages. This
should fix the problem with the modification date previous not getting
updated. Also dramatically simplifies the code. Note that this is
going to change in the future and be implemented via VOP_PUTPAGES().

vm_object.c:
Fixed a pile of bugs related to cleaning (vnode) objects. The performance
of vm_object_page_clean() is terrible when dealing with huge objects,
but this will change when we implement a binary tree to keep the object
pages sorted.

vm_pageout.c:
Fixed broken clustering of pageouts. Fixed race conditions and other
lockup style bugs in the scanning of pages. Improved performance.
1995-04-09 06:03:56 +00:00
Bruce Evans
3aa12267a5 Add and move declarations to fix all of the warnings from `gcc -Wimplicit'
(except in netccitt, netiso and netns) that I didn't notice when I fixed
"all" such warnings before.
1995-03-28 07:58:53 +00:00
David Greenman
17c4c40800 Fixed typo...using wrong variable in page_shortage calculation. 1995-03-28 05:58:35 +00:00
David Greenman
0bb3a0d2f4 Fixed "pages freed by daemon" statistic (again). 1995-03-28 05:35:29 +00:00
David Greenman
2ddba2158c Explicitly set page dirty if this is a write fault - reduces calls to
pmap_is_modified() later.
1995-03-27 02:41:00 +00:00
David Greenman
8953151fc8 Removed some obsolete flags.
Submitted by:   John Dyson
1995-03-26 23:33:14 +00:00
David Greenman
6c534ad868 Fix logic bug I just introduced with the flags to msync(). 1995-03-25 17:44:03 +00:00
David Greenman
492d73bd99 Pass syncio flag to vm_object_clean(). It remains unimplemented, however. 1995-03-25 17:36:57 +00:00
David Greenman
1e62bc6357 Disallow both MS_ASYNC and MS_INVALIDATE flags being set at the same time
in msync().
1995-03-25 17:36:00 +00:00
David Greenman
e6c6af1149 Added "flags" argument to msync, and implemented MS_ASYNC and MS_INVALIDATE.
The MS_ASYNC flag doesn't current work, and MS_INVALIDATE will only toss out
the pages in the address space (not all pages in the shadow chain).
1995-03-25 16:55:46 +00:00
David Greenman
7fd9a8b12f Implemented cnt.v_reactivated and moved vm_page_activate() routine to
before vm_page_deactivate().
1995-03-25 08:47:35 +00:00
David Greenman
260295f979 Removed (almost) meaningless "object cache lookups/hits" statistic. In
our framework, these numbers will usually be nearly the same, and not
because of any sort of high 'hit rate'.
1995-03-25 08:42:14 +00:00
David Greenman
a34297995a Removed cnt.v_nzfod: In our current scheme of things it is not possible
to accurately track this. It isn't an indicator of resource consumption
anyway.
Removed cnt.v_kernel_pages: We don't implement this and doing so accurately
would be very difficult (and ambiguous - since process pages are often
double mapped in the kernel and the process address spaces).
1995-03-25 06:09:33 +00:00
David Greenman
d7a0fc9360 Fixed warning caused by returning a value in a void function (introduced
in a recent commit by me). Relaxed checks before calling vm_object_remove;
a non-internal object always has a pager.
1995-03-23 05:19:44 +00:00
David Greenman
f5cf85d40a Removed unused fifth argument to vm_object_page_clean(). Fixed bug with
VTEXT not always getting cleared when it is supposed to. Added check to
make sure that vm_object_remove() isn't called with a NULL pager or for
a pager for an OBJ_INTERNAL object (neither of which will be on the hash
list). Clear OBJ_CANPERSIST if we decide to terminate it because of no
resident pages.
1995-03-22 12:24:11 +00:00
David Greenman
563128e49e Fixed potential sleep/wakeup race conditional with splhigh().
Submitted by:	John Dyson
1995-03-22 08:08:44 +00:00
David Greenman
c419d77e29 Added a check for wrong object size; print a warning, but deal with it
correctly. The warning will tell us that there is a bug somewhere else
in sizing the object correctly.

Submitted by:	John Dyson
1995-03-22 05:12:18 +00:00
David Greenman
8f4e17d4b2 Fixed bug in vm_mmap() where the object that is created in some cases
was the wrong size. This is the likely cause of panics reported by
Lars Fredriksen and Paul Richards related to a -1 blkno when paging
via the swap_pager.

Submitted by:	John Dyson
1995-03-22 05:08:41 +00:00
David Greenman
1b369d9858 Removed unused variable declaration missed in previous commit. 1995-03-21 23:09:53 +00:00
David Greenman
71263bf8db Removed do-nothing VOP_UPDATE() call. 1995-03-21 23:07:19 +00:00
David Greenman
bc9ad24756 Disallow non page-aligned file offsets in vm_mmap(). We don't support this
in either the high or low level parts of the VM system. Just return EINVAL
in this case, just like SunOS does.
1995-03-21 10:15:52 +00:00