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Nick Piggin eb2be18931 mm: buffered write cleanup 
Quite a bit of code is used in maintaining these "cached pages" that are
probably pretty unlikely to get used. It would require a narrow race where
the page is inserted concurrently while this process is allocating a page
in order to create the spare page. Then a multi-page write into an uncached
part of the file, to make use of it.

Next, the buffered write path (and others) uses its own LRU pagevec when it
should be just using the per-CPU LRU pagevec (which will cut down on both data
and code size cacheline footprint). Also, these private LRU pagevecs are
emptied after just a very short time, in contrast with the per-CPU pagevecs
that are persistent. Net result: 7.3 times fewer lru_lock acquisitions required
to add the pages to pagecache for a bulk write (in 4K chunks).

[this gets rid of some cond_resched() calls in readahead.c and mpage.c due
 to clashes in -mm. What put them there, and why? ]

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2007-10-16 09:42:54 -07:00
..
Kconfig vmemmap: generify initialisation via helpers 2007-10-16 09:42:51 -07:00
Makefile Generic Virtual Memmap support for SPARSEMEM 2007-10-16 09:42:51 -07:00
allocpercpu.c Slab allocators: Replace explicit zeroing with __GFP_ZERO 2007-07-17 10:23:02 -07:00
backing-dev.c remove mm/backing-dev.c:congestion_wait_interruptible() 2007-07-16 09:05:52 -07:00
bootmem.c [PATCH] remove EXPORT_UNUSED_SYMBOL'ed symbols 2006-12-07 08:39:44 -08:00
bounce.c Drop 'size' argument from bio_endio and bi_end_io 2007-10-10 09:25:57 +02:00
fadvise.c [PATCH] mm: change uses of f_{dentry,vfsmnt} to use f_path 2006-12-08 08:28:43 -08:00
filemap.c mm: buffered write cleanup 2007-10-16 09:42:54 -07:00
filemap.h Revert "[PATCH] generic_file_buffered_write(): handle zero-length iovec segments" 2007-10-16 09:42:54 -07:00
filemap_xip.c mm: fault feedback #2 2007-07-19 10:04:41 -07:00
fremap.c fix VM_CAN_NONLINEAR check in sys_remap_file_pages 2007-10-08 12:58:14 -07:00
highmem.c Create the ZONE_MOVABLE zone 2007-07-17 10:22:59 -07:00
hugetlb.c hugetlb: fix clear_user_highpage arguments 2007-10-01 07:52:23 -07:00
internal.h Make page->private usable in compound pages 2007-05-07 12:12:53 -07:00
madvise.c speed up madvise_need_mmap_write() usage 2007-07-16 09:05:36 -07:00
memory.c calculation of pgoff in do_linear_fault() uses mixed units 2007-10-16 09:42:53 -07:00
memory_hotplug.c memory hotplug: fix unnecessary calling of init_currenty_empty_zone() 2007-06-01 08:18:29 -07:00
mempolicy.c Mem Policy: add MPOL_F_MEMS_ALLOWED get_mempolicy() flag 2007-10-16 09:42:54 -07:00
mempool.c Slab allocators: Replace explicit zeroing with __GFP_ZERO 2007-07-17 10:23:02 -07:00
migrate.c mm/migrate.c __user annotation 2007-10-14 12:41:51 -07:00
mincore.c [PATCH] mincore: vma crossing fix 2007-02-15 09:57:03 -08:00
mlock.c do not limit locked memory when RLIMIT_MEMLOCK is RLIM_INFINITY 2007-07-16 09:05:37 -07:00
mmap.c fix NULL pointer dereference in __vm_enough_memory() 2007-08-22 19:52:45 -07:00
mmzone.c [PATCH] remove EXPORT_UNUSED_SYMBOL'ed symbols 2006-12-07 08:39:44 -08:00
mprotect.c mm: variable length argument support 2007-07-19 10:04:45 -07:00
mremap.c mm: variable length argument support 2007-07-19 10:04:45 -07:00
msync.c Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
nommu.c fix NULL pointer dereference in __vm_enough_memory() 2007-08-22 19:52:45 -07:00
oom_kill.c oom: print points as unsigned long 2007-07-31 15:39:36 -07:00
page-writeback.c mm: use lockless radix-tree probe 2007-10-16 09:42:53 -07:00
page_alloc.c mm: no need to cast vmalloc() return value in zone_wait_table_init() 2007-10-16 09:42:54 -07:00
page_io.c Drop 'size' argument from bio_endio and bi_end_io 2007-10-10 09:25:57 +02:00
pdflush.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
prio_tree.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
quicklist.c Quicklists for page table pages 2007-05-07 12:12:54 -07:00
readahead.c mm: buffered write cleanup 2007-10-16 09:42:54 -07:00
rmap.c mm: Remove slab destructors from kmem_cache_create(). 2007-07-20 10:11:58 +09:00
shmem.c Clean up duplicate includes in mm/ 2007-10-16 09:42:52 -07:00
shmem_acl.c [PATCH] Fix typos in mm/shmem_acl.c 2006-10-11 11:14:23 -07:00
slab.c Slab allocators: fail if ksize is called with a NULL parameter 2007-10-16 09:42:53 -07:00
slob.c Slab allocators: fail if ksize is called with a NULL parameter 2007-10-16 09:42:53 -07:00
slub.c Slab allocators: fail if ksize is called with a NULL parameter 2007-10-16 09:42:53 -07:00
sparse-vmemmap.c vmemmap: generify initialisation via helpers 2007-10-16 09:42:51 -07:00
sparse.c Generic Virtual Memmap support for SPARSEMEM 2007-10-16 09:42:51 -07:00
swap.c mm: use pagevec to rotate reclaimable page 2007-10-16 09:42:54 -07:00
swap_state.c mm: clarify __add_to_swap_cache locking 2007-10-16 09:42:53 -07:00
swapfile.c Replace CONFIG_SOFTWARE_SUSPEND with CONFIG_HIBERNATION 2007-07-29 16:45:38 -07:00
thrash.c Bug in mm/thrash.c function grab_swap_token() 2007-05-11 08:29:32 -07:00
tiny-shmem.c [PATCH] mm/{,tiny-}shmem.c cleanups 2007-03-01 14:53:35 -08:00
truncate.c mm: merge populate and nopage into fault (fixes nonlinear) 2007-07-19 10:04:41 -07:00
util.c Slab allocators: fail if ksize is called with a NULL parameter 2007-10-16 09:42:53 -07:00
vmalloc.c lguest: export symbols for lguest as a module 2007-07-19 10:04:52 -07:00
vmscan.c mm: prevent kswapd from freeing excessive amounts of lowmem 2007-10-16 09:42:54 -07:00
vmstat.c Remove fs.h from mm.h 2007-07-29 17:09:29 -07:00