Hugh Dickins a7016235a6 mm: fix migratetype bug which slowed swapping ... After memory pressure has forced it to dip into the reserves, 2.6.32's 5f8dcc2121 "page-allocator: split per-cpu list into one-list-per-migrate-type" has been returning MIGRATE_RESERVE pages to the MIGRATE_MOVABLE free_list: in some sense depleting reserves. Fix that in the most straightforward way (which, considering the overheads of alternative approaches, is Mel's preference): the right migratetype is already in page_private(page), but free_pcppages_bulk() wasn't using it. How did this bug show up? As a 20% slowdown in my tmpfs loop kbuild swapping tests, on PowerMac G5 with SLUB allocator. Bisecting to that commit was easy, but explaining the magnitude of the slowdown not easy. The same effect appears, but much less markedly, with SLAB, and even less markedly on other machines (the PowerMac divides into fewer zones than x86, I think that may be a factor). We guess that lumpy reclaim of short-lived high-order pages is implicated in some way, and probably this bug has been tickling a poor decision somewhere in page reclaim. But instrumentation hasn't told me much, I've run out of time and imagination to determine exactly what's going on, and shouldn't hold up the fix any longer: it's valid, and might even fix other misbehaviours. Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Acked-by: Mel Gorman <mel@csn.ul.ie> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2010-01-29 10:28:09 -08:00
..
backing-dev.c
bootmem.c
bounce.c
debug-pagealloc.c
dmapool.c
fadvise.c
failslab.c
filemap_xip.c
filemap.c	mm: add new 'read_cache_page_gfp()' helper function	2010-01-27 09:20:03 -08:00
fremap.c
highmem.c
hugetlb.c	mm: hugetlb: fix clear_huge_page()	2010-01-11 09:34:06 -08:00
hwpoison-inject.c
init-mm.c
internal.h
Kconfig	HWPOISON: Add PROC_FS dependency to hwpoison injector v2	2009-12-21 19:56:42 +01:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c
ksm.c
maccess.c	maccess,probe_kernel: Allow arch specific override probe_kernel_(read|write)	2010-01-07 11:58:36 -06:00
madvise.c
Makefile
memcontrol.c	memcg: ensure list is empty at rmdir	2010-01-16 12:15:39 -08:00
memory_hotplug.c
memory-failure.c	HWPOISON: Add PROC_FS dependency to hwpoison injector v2	2009-12-21 19:56:42 +01:00
memory.c
mempolicy.c
mempool.c
migrate.c
mincore.c
mlock.c
mm_init.c
mmap.c	mm: move sys_mmap_pgoff from util.c	2009-12-30 12:23:27 -08:00
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c
msync.c
nommu.c	nommu: fix shared mmap after truncate shrinkage problems	2010-01-16 12:15:40 -08:00
oom_kill.c
page_alloc.c	mm: fix migratetype bug which slowed swapping	2010-01-29 10:28:09 -08:00
page_cgroup.c
page_io.c
page_isolation.c
page-writeback.c
pagewalk.c
percpu.c	percpu: avoid calling __pcpu_ptr_to_addr(NULL)	2010-01-11 09:34:04 -08:00
prio_tree.c
quicklist.c
readahead.c
rmap.c
shmem.c
slab.c	SLAB: Fix lockdep annotation breakage	2009-12-28 20:57:27 +02:00
slob.c
slub.c
sparse-vmemmap.c
sparse.c
swap_state.c
swap.c
swapfile.c
thrash.c
truncate.c	vfs: Fix vmtruncate() regression	2010-01-13 16:09:33 -08:00
util.c	nommu: don't need get_unmapped_area() for NOMMU	2010-01-16 12:15:40 -08:00
vmalloc.c	vmalloc: remove BUG_ON due to racy counting of VM_LAZY_FREE	2010-01-21 07:20:06 -08:00
vmscan.c	vmscan: kswapd: don't retry balance_pgdat() if all zones are unreclaimable	2010-01-16 12:15:39 -08:00
vmstat.c