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Here are patches for designated initializers in kernel/*.
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These were totally unused for a long time. It's interesting how
many files include swapctl.h, though..
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Alan's overcommit patch, brought to 2.5 by Robert Love.
Can't say I've tested its functionality at all, but it doesn't crash,
it has been in -ac and RH kernels for some time and I haven't observed
any of its functions on profiles.
"So what is strict VM overcommit? We introduce new overcommit
policies that attempt to never succeed an allocation that can not be
fulfilled by the backing store and consequently never OOM. This is
achieved through strict accounting of the committed address space and
a policy to allow/refuse allocations based on that accounting.
In the strictest of modes, it should be impossible to allocate more
memory than available and impossible to OOM. All memory failures
should be pushed down to the allocation routines -- malloc, mmap, etc.
The new modes are available via sysctl (same as before). See
Documentation/vm/overcommit-accounting for more information."
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Writeback/pdflush cleanup patch from Steven Augart
* Exposes nr_pdflush_threads as /proc/sys/vm/nr_pdflush_threads, read-only.
(I like this - I expect that management of the pdflush thread pool
will be important for many-spindle machines, and this is a neat way
of getting at the info).
* Adds minimum and maximum checking to the five writable pdflush
and fs-writeback parameters.
* Minor indentation fix in sysctl.c
* mm/pdflush.c now includes linux/writeback.h, which prototypes
pdflush_operation. This is so that the compiler can
automatically check that the prototype matches the definition.
* Adds a few comments to existing code.
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Adds five sysctls for tuning the writeback behaviour:
dirty_async_ratio
dirty_background_ratio
dirty_sync_ratio
dirty_expire_centisecs
dirty_writeback_centisecs
these are described in Documentation/filesystems/proc.txt They are
basically the tradiditional knobs which we've always had...
We are accreting a ton of obsolete sysctl numbers under /proc/sys/vm/.
I didn't recycle these - just mark them unused and remove the obsolete
documentation.
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I found that 'max' pointer is not updated in proc_dointvec_minmax()
and proc_doulongvec_minmax(), when I write smaller values than min to
/proc/sys entry (and val<*min++ check becomes true.)
This may lead to min/max checking of values with bogus maximum.
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[ I reversed the order in which writeback walks the superblock's
dirty inodes. It sped up dbench's unlink phase greatly. I'm
such a sleaze ]
The core writeback patch. Switches file writeback from the dirty
buffer LRU over to address_space.dirty_pages.
- The buffer LRU is removed
- The buffer hash is removed (uses blockdev pagecache lookups)
- The bdflush and kupdate functions are implemented against
address_spaces, via pdflush.
- The relationship between pages and buffers is changed.
- If a page has dirty buffers, it is marked dirty
- If a page is marked dirty, it *may* have dirty buffers.
- A dirty page may be "partially dirty". block_write_full_page
discovers this.
- A bunch of consistency checks of the form
if (!something_which_should_be_true())
buffer_error();
have been introduced. These fog the code up but are important for
ensuring that the new buffer/page code is working correctly.
- New locking (inode.i_bufferlist_lock) is introduced for exclusion
from try_to_free_buffers(). This is needed because set_page_dirty
is called under spinlock, so it cannot lock the page. But it
needs access to page->buffers to set them all dirty.
i_bufferlist_lock is also used to protect inode.i_dirty_buffers.
- fs/inode.c has been split: all the code related to file data writeback
has been moved into fs/fs-writeback.c
- Code related to file data writeback at the address_space level is in
the new mm/page-writeback.c
- try_to_free_buffers() is now non-blocking
- Switches vmscan.c over to understand that all pages with dirty data
are now marked dirty.
- Introduces a new a_op for VM writeback:
->vm_writeback(struct page *page, int *nr_to_write)
this is a bit half-baked at present. The intent is that the address_space
is given the opportunity to perform clustered writeback. To allow it to
opportunistically write out disk-contiguous dirty data which may be in other zones.
To allow delayed-allocate filesystems to get good disk layout.
- Added address_space.io_pages. Pages which are being prepared for
writeback. This is here for two reasons:
1: It will be needed later, when BIOs are assembled direct
against pagecache, bypassing the buffer layer. It avoids a
deadlock which would occur if someone moved the page back onto the
dirty_pages list after it was added to the BIO, but before it was
submitted. (hmm. This may not be a problem with PG_writeback logic).
2: Avoids a livelock which would occur if some other thread is continually
redirtying pages.
- There are two known performance problems in this code:
1: Pages which are locked for writeback cause undesirable
blocking when they are being overwritten. A patch which leaves
pages unlocked during writeback comes later in the series.
2: While inodes are under writeback, they are locked. This
causes namespace lookups against the file to get unnecessarily
blocked in wait_on_inode(). This is a fairly minor problem.
I don't have a fix for this at present - I'll fix this when I
attach dirty address_spaces direct to super_blocks.
- The patch vastly increases the amount of dirty data which the
kernel permits highmem machines to maintain. This is because the
balancing decisions are made against the amount of memory in the
machine, not against the amount of buffercache-allocatable memory.
This may be very wrong, although it works fine for me (2.5 gigs).
We can trivially go back to the old-style throttling with
s/nr_free_pagecache_pages/nr_free_buffer_pages/ in
balance_dirty_pages(). But better would be to allow blockdev
mappings to use highmem (I'm thinking about this one, slowly). And
to move writer-throttling and writeback decisions into the VM (modulo
the file-overwriting problem).
- Drops 24 bytes from struct buffer_head. More to come.
- There's some gunk like super_block.flags:MS_FLUSHING which needs to
be killed. Need a better way of providing collision avoidance
between pdflush threads, to prevent more than one pdflush thread
working a disk at the same time.
The correct way to do that is to put a flag in the request queue to
say "there's a pdlfush thread working this disk". This is easy to
do: just generalise the "ra_pages" pointer to point at a struct which
includes ra_pages and the new collision-avoidance flag.
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Mostly harmless but 1-2 break compilation.
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This version of sys_nfsservctl() fix hadn't made DaveM complain.
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enables the allocation of the pagetables in highmem.
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procfs switched to alloc_inode/destroy_inode.
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- Jens Axboe: more bio updates, fix some request list bogosity under load
- Al Viro: export seq_xxx functions
- Manfred Spraul: include file cleanups, pc110pad compile fix
- David Woodhouse: fix JFFS2 write error handling
- Dave Jones: start merging up with 2.4.x patches
- Manfred Spraul: coredump fixes, FS event counter cleanups
- me: fix SCSI CD-ROM sectorsize BIO breakage
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- Jeff Garzik: separate out handling of older tulip chips
- Jens Axboe: more bio stuff
- Anton Altaparmakov: NTFS 1.1.21 update
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- Keith Owens: module exporting error checking
- Greg KH: USB update
- Paul Mackerras: clean up wait_init_idle(), ppc prefetch macros
- Jan Kara: quota fixes
- Abraham vd Merwe: agpgart support for Intel 830M
- Jakub Jelinek: ELF loader cleanups
- Al Viro: more cleanups
- David Miller: sparc64 fix, netfilter fixes
- me: tweak resurrected oom handling
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- me/Al Viro: fix bdget() oops with block device modules that don't
clean up after they exit
- Alan Cox: continued merging (drivers, license tags)
- David Miller: sparc update, network fixes
- Christoph Hellwig: work around broken drivers that add a gendisk more
than once
- Jakub Jelinek: handle more ELF loading special cases
- Trond Myklebust: NFS client and lockd reclaimer cleanups/fixes
- Greg KH: USB updates
- Mikael Pettersson: sparate out local APIC / IO-APIC config options
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- Alan Cox: much more merging
- Pete Zaitcev: ymfpci race fixes
- Andrea Arkangeli: VM race fix and OOM tweak.
- Arjan Van de Ven: merge RH kernel fixes
- Andi Kleen: use more readable 'likely()/unlikely()' instead of __builtin_expect()
- Keith Owens: fix 64-bit ELF types
- Gerd Knorr: mark more broken PCI bridges, update btaudio driver
- Paul Mackerras: powermac driver update
- me: clean up PTRACE_DETACH to use common infrastructure
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- Neil Brown: md cleanups/fixes
- Andrew Morton: console locking merge
- Andrea Arkangeli: major VM merge
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- Greg KH: start migration to new "min()/max()"
- Roman Zippel: move affs over to "min()/max()".
- Vojtech Pavlik: VIA update (make sure not to IRQ-unmask a vt82c576)
- Jan Kara: quota bug-fix (don't decrement quota for non-counted inode)
- Anton Altaparmakov: more NTFS updates
- Al Viro: make nosuid/noexec/nodev be per-mount flags, not per-filesystem
- Alan Cox: merge input/joystick layer differences, driver and alpha merge
- Keith Owens: scsi Makefile cleanup
- Trond Myklebust: fix oopsable race in locking code
- Jean Tourrilhes: IrDA update
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- Al Viro: block device cleanups
- Marcelo Tosatti: make bounce buffer allocations more robust (it's ok
for them to do IO, just not cause recursive bounce IO. So allow them)
- Anton Altaparmakov: NTFS update (1.1.17)
- Paul Mackerras: PPC update (big re-org)
- Petko Manolov: USB pegasus driver fixes
- David Miller: networking and sparc updates
- Trond Myklebust: Export atomic_dec_and_lock
- OGAWA Hirofumi: find and fix umsdos "filldir" users that were broken
by the 64-bit-cleanups. Fix msdos warnings.
- Al Viro: superblock handling cleanups and race fixes
- Johannes Erdfelt++: USB updates
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- Jeff Hartmann: serverworks AGP gart unload memory leak fix
- Marcelo Tosatti: make zone_inactive_shortage() return how big the shortage is.
- Hugh Dickins: tidy up age_page_down()
- Al Viro: super block handling cleanups
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- Hui-Fen Hsu: sis900 driver update
- NIIBE Yutaka: Super-H update
- Alan Cox: more resyncs (ARM down, but more to go)
- David Miller: network zerocopy, Sparc sync, qlogic,FC fix, etc.
- David Miller/me: get rid of various drivers hacks to do mmap
alignment behind the back of the VM layer. Create a real
protocol for it.
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- sync up more with Alan
- Urban Widmark: smbfs and HIGHMEM fix
- Chris Mason: reiserfs tail unpacking fix ("null bytes in reiserfs files")
- Adan Richter: new cpia usb ID
- Hugh Dickins: misc small sysv ipc fixes
- Andries Brouwer: remove overly restrictive sector size check for
SCSI cd-roms
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- big S/390x 64-bit merge
- typos and license name fixes. doc updates.
- more include file cleanups (phase out "malloc.h")
- even more elevator corner cases.. When not merging, find the best insertion point.
- pmac ide update
- network fixes (netif_wake_queue on tx timeout)
- USB printer select() fix
- NFS client missed initialization, deamon fixed client address check
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- Jens: better ordering of requests when unable to merge
- Neil Brown: make md work as a module again (we cannot autodetect
in modules, not enough background information)
- Neil Brown: raid5 SMP locking cleanups
- Neil Brown: nfsd: handle Irix NFS clients named pipe behavior and
dentry leak fix
- maestro3 shutdown fix
- fix dcache hash calculation that could cause bad hashes under certain
circumstances (Dean Gaudet)
- David Miller: networking and sparc updates
- Jeff Garzik: include file cleanups
- Andy Grover: ACPI update
- Coda-fs error return fixes
- rth: alpha Jensen update
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- driver sync up with Alan
- Andrew Morton: wakeup cleanup and race fix
- Paul Mackerras: macintosh driver updates.
- don't trust "page_count()" on reserved pages!
- Russell King: fix serious IDE multimode write bug!
- me, Jens, others: fix elevator problem
- ARM, MIPS and cris architecture updates
- alpha updates: better page clear/copy, avoid kernel lock in execve
- USB and firewire updates
- ISDN updates
- Irda updates
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