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Rik van Riel 7e9cd48420 vmscan: fix pagecache reclaim referenced bit check 
Moving referenced pages back to the head of the active list creates a huge
scalability problem, because by the time a large memory system finally
runs out of free memory, every single page in the system will have been
referenced.

Not only do we not have the time to scan every single page on the active
list, but since they have will all have the referenced bit set, that bit
conveys no useful information.

A more scalable solution is to just move every page that hits the end of
the active list to the inactive list.

We clear the referenced bit off of mapped pages, which need just one
reference to be moved back onto the active list.

Unmapped pages will be moved back to the active list after two references
(see mark_page_accessed).  We preserve the PG_referenced flag on unmapped
pages to preserve accesses that were made while the page was on the active
list.

Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-20 08:50:25 -07:00
..
allocpercpu.c mm/allocpercpu.c: make 4 functions static 2008-07-26 12:00:12 -07:00
backing-dev.c mm: bdi: fix race in bdi_class device creation 2008-05-20 13:31:53 -07:00
bootmem.c misc: replace __FUNCTION__ with __func__ 2008-10-16 11:21:30 -07:00
bounce.c highmem: use bio_has_data() in the bounce path 2008-10-09 08:56:01 +02:00
dmapool.c dmapool: enable debugging for CONFIG_SLUB_DEBUG_ON too 2008-04-28 08:58:20 -07:00
fadvise.c Remove Andrew Morton's old email accounts 2008-10-16 11:21:32 -07:00
filemap.c vmscan: split LRU lists into anon & file sets 2008-10-20 08:50:25 -07:00
filemap_xip.c mm: xip/ext2 fix block allocation race 2008-08-20 15:40:32 -07:00
fremap.c mmu-notifiers: core 2008-07-28 16:30:21 -07:00
highmem.c x86, pat: avoid highmem cache attribute aliasing 2008-08-15 17:22:57 +02:00
hugetlb.c vmscan: split LRU lists into anon & file sets 2008-10-20 08:50:25 -07:00
internal.h vmscan: move isolate_lru_page() to vmscan.c 2008-10-20 08:50:25 -07:00
Kconfig Merge branch 'core-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-10-16 15:17:40 -07:00
maccess.c kgdb: fix optional arch functions and probe_kernel_* 2008-04-17 20:05:39 +02:00
madvise.c madvise: update function comment of madvise_dontneed 2008-07-30 09:41:45 -07:00
Makefile mmu-notifiers: core 2008-07-28 16:30:21 -07:00
memcontrol.c vmscan: split LRU lists into anon & file sets 2008-10-20 08:50:25 -07:00
memory.c vmscan: split LRU lists into anon & file sets 2008-10-20 08:50:25 -07:00
memory_hotplug.c vmscan: move isolate_lru_page() to vmscan.c 2008-10-20 08:50:25 -07:00
mempolicy.c vmscan: move isolate_lru_page() to vmscan.c 2008-10-20 08:50:25 -07:00
mempool.c spelling fixes: mm/ 2007-10-20 01:27:18 +02:00
migrate.c define page_file_cache() function 2008-10-20 08:50:25 -07:00
mincore.c mm: remove nopage 2008-04-28 08:58:18 -07:00
mlock.c mlock() fix return values 2008-08-04 16:58:45 -07:00
mm_init.c mm: mminit_loglevel cannot be __meminitdata anymore 2008-08-20 15:40:30 -07:00
mmap.c mmap: fix petty bug in anonymous shared mmap offset handling 2008-09-03 19:58:53 -07:00
mmu_notifier.c mmu-notifiers: core 2008-07-28 16:30:21 -07:00
mmzone.c mm: mark the correct zone as full when scanning zonelists 2008-09-13 14:41:52 -07:00
mprotect.c mmu-notifiers: core 2008-07-28 16:30:21 -07:00
mremap.c mmu-notifiers: core 2008-07-28 16:30:21 -07:00
msync.c
nommu.c nommu: Provide vmalloc_exec(). 2008-08-04 16:01:47 +09:00
oom_kill.c security: Fix setting of PF_SUPERPRIV by __capable() 2008-08-14 22:59:43 +10:00
page-writeback.c vmscan: split LRU lists into anon & file sets 2008-10-20 08:50:25 -07:00
page_alloc.c vmscan: second chance replacement for anonymous pages 2008-10-20 08:50:25 -07:00
page_io.c mm: fix PageUptodate data race 2008-02-05 09:44:19 -08:00
page_isolation.c memory hotplug: missing zone->lock in test_pages_isolated() 2008-10-02 15:53:13 -07:00
pagewalk.c pagemap: pass mm into pagewalkers 2008-06-12 18:05:41 -07:00
pdflush.c Remove Andrew Morton's old email accounts 2008-10-16 11:21:32 -07:00
prio_tree.c spelling fixes: mm/ 2007-10-20 01:27:18 +02:00
quicklist.c mm: size of quicklists shouldn't be proportional to the number of CPUs 2008-09-02 19:21:38 -07:00
readahead.c vmscan: split LRU lists into anon & file sets 2008-10-20 08:50:25 -07:00
rmap.c anon_vma_prepare: properly lock even newly allocated entries 2008-10-19 11:50:35 -07:00
shmem.c vmscan: split LRU lists into anon & file sets 2008-10-20 08:50:25 -07:00
shmem_acl.c [PATCH] sanitize ->permission() prototype 2008-07-26 20:53:14 -04:00
slab.c mm: unexport ksize 2008-07-29 23:44:26 +03:00
slob.c SLOB: fix bogus ksize calculation fix 2008-10-09 12:18:27 -07:00
slub.c slub: fixed uninitialized counter in struct kmem_cache_node 2008-09-15 09:49:05 +03:00
sparse-vmemmap.c Christoph has moved 2008-07-04 10:40:04 -07:00
sparse.c mm/sparse.c: removed duplicated include 2008-08-12 16:07:30 -07:00
swap.c vmscan: split LRU lists into anon & file sets 2008-10-20 08:50:25 -07:00
swap_state.c vmscan: split LRU lists into anon & file sets 2008-10-20 08:50:25 -07:00
swapfile.c vmscan: free swap space on swap-in/activation 2008-10-20 08:50:25 -07:00
thrash.c
tiny-shmem.c mm: tiny-shmem nommu fix 2008-10-02 15:53:13 -07:00
truncate.c Remove Andrew Morton's old email accounts 2008-10-16 11:21:32 -07:00
util.c mm: Make generic weak get_user_pages_fast and EXPORT_GPL it 2008-08-12 17:52:53 +10:00
vmalloc.c Merge branches 'x86/xen', 'x86/build', 'x86/microcode', 'x86/mm-debug-v2', 'x86/memory-corruption-check', 'x86/early-printk', 'x86/xsave', 'x86/ptrace-v2', 'x86/quirks', 'x86/setup', 'x86/spinlocks' and 'x86/signal' into x86/core-v2 2008-10-12 15:50:02 +02:00
vmscan.c vmscan: fix pagecache reclaim referenced bit check 2008-10-20 08:50:25 -07:00
vmstat.c vmscan: second chance replacement for anonymous pages 2008-10-20 08:50:25 -07:00