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
..
Kconfig	HWPOISON: Add PROC_FS dependency to hwpoison injector v2	2009-12-21 19:56:42 +01:00
Kconfig.debug	trivial: improve help text for mm debug config options	2009-09-21 15:14:57 +02:00
Makefile	make generic_acl slightly more generic	2009-12-16 12:16:49 -05:00
backing-dev.c	flusher: Fix PF_FROZEN race	2009-12-03 13:49:43 +01:00
bootmem.c	mm/bootmem.c: properly __init-annotate helper functions	2009-12-15 08:53:20 -08:00
bounce.c	block: remove some includings of blktrace_api.h	2009-06-16 11:19:36 +02:00
debug-pagealloc.c	generic debug pagealloc	2009-04-01 08:59:13 -07:00
dmapool.c	dmapools: protect page_list walk in show_pools()	2009-06-30 18:56:00 -07:00
fadvise.c	readahead: move max_sane_readahead() calls into force_page_cache_readahead()	2009-06-16 19:47:28 -07:00
failslab.c	kmemtrace, mm: fix slab.h dependency problem in mm/failslab.c	2009-04-03 12:23:01 +02:00
filemap.c	mm: add new 'read_cache_page_gfp()' helper function	2010-01-27 09:20:03 -08:00
filemap_xip.c	const: mark struct vm_struct_operations	2009-09-27 11:39:25 -07:00
fremap.c	Do not account for the address space used by hugetlbfs using VM_ACCOUNT	2009-02-10 10:48:42 -08:00
highmem.c	highmem: Fix debug_kmap_atomic() to also handle KM_IRQ_PTE, KM_NMI, and KM_NMI_PTE	2009-11-10 04:15:47 +01:00
hugetlb.c	mm: hugetlb: fix clear_huge_page()	2010-01-11 09:34:06 -08:00
hwpoison-inject.c	HWPOISON: Don't do early filtering if filter is disabled	2009-12-16 12:20:01 +01:00
init-mm.c	mm: consolidate init_mm definition	2009-06-16 19:47:28 -07:00
internal.h	HWPOISON: add an interface to switch off/on all the page filters	2009-12-16 12:19:59 +01:00
kmemcheck.c	kmemcheck: add hooks for the page allocator	2009-06-15 15:48:33 +02:00
kmemleak-test.c	percpu: clean up percpu variable definitions	2009-06-24 15:13:48 +09:00
kmemleak.c	Merge branch 'kmemleak' of git://linux-arm.org/linux-2.6	2009-12-17 16:00:19 -08:00
ksm.c	ksm: remove unswappable max_kernel_pages	2009-12-15 08:53:20 -08:00
maccess.c	maccess,probe_kernel: Allow arch specific override probe_kernel_(read|write)	2010-01-07 11:58:36 -06:00
madvise.c	HWPOISON: Add a madvise() injector for soft page offlining	2009-12-16 12:20:00 +01:00
memcontrol.c	memcg: ensure list is empty at rmdir	2010-01-16 12:15:39 -08:00
memory-failure.c	HWPOISON: Add PROC_FS dependency to hwpoison injector v2	2009-12-21 19:56:42 +01:00
memory.c	Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6	2009-12-16 12:36:49 -08:00
memory_hotplug.c	mm: fix section mismatch in memory_hotplug.c	2009-12-15 08:53:20 -08:00
mempolicy.c	ksm: memory hotremove migration only	2009-12-15 08:53:20 -08:00
mempool.c	mm: remove broken 'kzalloc' mempool	2009-09-22 07:17:35 -07:00
migrate.c	mm: remove unevictable_migrate_page function	2009-12-15 08:53:23 -08:00
mincore.c	mm: hugetlb: fix hugepage memory leak in mincore()	2009-12-15 08:53:24 -08:00
mlock.c	mlock: replace stale comments in munlock_vma_page()	2009-12-15 08:53:23 -08:00
mm_init.c	mm: mminit_loglevel cannot be __meminitdata anymore	2008-08-20 15:40:30 -07:00
mmap.c	mm: move sys_mmap_pgoff from util.c	2009-12-30 12:23:27 -08:00
mmu_context.c	mm: reduce atomic use on use_mm fast path	2009-09-22 07:17:42 -07:00
mmu_notifier.c	ksm: add mmu_notifier set_pte_at_notify()	2009-09-22 07:17:31 -07:00
mmzone.c	[ARM] Double check memmap is actually valid with a memmap has unexpected holes V2	2009-05-18 11:22:24 +01:00
mprotect.c	perf: Do the big rename: Performance Counters -> Performance Events	2009-09-21 14:28:04 +02:00
mremap.c	Take arch_mmap_check() into get_unmapped_area()	2009-12-11 06:44:58 -05:00
msync.c	[CVE-2009-0029] System call wrappers part 13	2009-01-14 14:15:23 +01:00
nommu.c	nommu: fix shared mmap after truncate shrinkage problems	2010-01-16 12:15:40 -08:00
oom_kill.c	memcg: avoid oom-killing innocent task in case of use_hierarchy	2009-12-16 07:20:07 -08:00
page-writeback.c	writeback: remove unused nonblocking and congestion checks	2009-12-03 13:54:25 +01:00
page_alloc.c	mm: fix migratetype bug which slowed swapping	2010-01-29 10:28:09 -08:00
page_cgroup.c	memory hotplug: alloc page from other node in memory online	2009-09-22 07:17:26 -07:00
page_io.c	swap: rework map_swap_page() again	2009-12-15 08:53:16 -08:00
page_isolation.c	memory hotplug: fix page_zone() calculation in test_pages_isolated()	2008-11-06 15:41:19 -08:00
pagewalk.c	mm hugetlb: add hugepage support to pagemap	2009-12-15 08:53:24 -08:00
percpu.c	percpu: avoid calling __pcpu_ptr_to_addr(NULL)	2010-01-11 09:34:04 -08:00
prio_tree.c	spelling fixes: mm/	2007-10-20 01:27:18 +02:00
quicklist.c	cpumask: use new-style cpumask ops in mm/quicklist.	2009-09-24 09:34:52 +09:30
readahead.c	readahead: add blk_run_backing_dev	2009-12-17 15:45:32 -08:00
rmap.c	memcg: make memcg's file mapped consistent with global VM	2009-12-16 07:20:07 -08:00
shmem.c	Fix breakage in shmem.c	2009-12-16 19:48:48 -05:00
slab.c	SLAB: Fix lockdep annotation breakage	2009-12-28 20:57:27 +02:00
slob.c	slab: remove duplicate kmem_cache_init_late() declarations	2009-08-06 11:36:25 +03:00
slub.c	Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-12-14 10:13:22 -08:00
sparse-vmemmap.c	memory hotplug: alloc page from other node in memory online	2009-09-22 07:17:26 -07:00
sparse.c	memory hotplug: alloc page from other node in memory online	2009-09-22 07:17:26 -07:00
swap.c	mm: replace various uses of num_physpages by totalram_pages	2009-09-22 07:17:38 -07:00
swap_state.c	mm: add_to_swap_cache() does not return -EEXIST	2009-09-22 07:17:35 -07:00
swapfile.c	ksm: let shared pages be swappable	2009-12-15 08:53:19 -08:00
thrash.c	mm: pass mm to grab_swap_token	2009-06-23 12:50:05 -07:00
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	vmscan: stop kswapd waiting on congestion when the min watermark is not being met	2009-12-15 08:53:16 -08:00