Mel Gorman e084b2d95e page-allocator: preserve PFN ordering when __GFP_COLD is set ... Fix a post-2.6.24 performace regression caused by 3dfa5721f1 ("page-allocator: preserve PFN ordering when __GFP_COLD is set"). Narayanan reports "The regression is around 15%. There is no disk controller as our setup is based on Samsung OneNAND used as a memory mapped device on a OMAP2430 based board." The page allocator tries to preserve contiguous PFN ordering when returning pages such that repeated callers to the allocator have a strong chance of getting physically contiguous pages, particularly when external fragmentation is low. However, of the bulk of the allocations have __GFP_COLD set as they are due to aio_read() for example, then the PFNs are in reverse PFN order. This can cause performance degration when used with IO controllers that could have merged the requests. This patch attempts to preserve the contiguous ordering of PFNs for users of __GFP_COLD. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reported-by: Narayananu Gopalakrishnan <narayanan.g@samsung.com> Tested-by: Narayanan Gopalakrishnan <narayanan.g@samsung.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-07-29 19:10:34 -07:00
..
allocpercpu.c	percpu: __percpu_depopulate_mask can take a const mask	2009-04-06 13:44:15 -07:00
backing-dev.c	Fix congestion_wait() sync/async vs read/write confusion	2009-07-10 20:31:53 +02:00
bootmem.c	kmemleak: Add callbacks to the bootmem allocator	2009-07-08 14:25:14 +01:00
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_xip.c	mm: do_xip_mapping_read: fix length calculation	2009-04-02 19:04:49 -07:00
filemap.c	mm: mark page accessed before we write_end()	2009-07-06 13:57:03 -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	block: remove some includings of blktrace_api.h	2009-06-16 11:19:36 +02:00
hugetlb.c	hugetlb: fault flags instead of write_access	2009-06-23 11:23:33 -07:00
init-mm.c	mm: consolidate init_mm definition	2009-06-16 19:47:28 -07:00
internal.h	vmscan: do not unconditionally treat zones that fail zone_reclaim() as full	2009-06-16 19:47:45 -07:00
Kconfig	Merge branch 'akpm'	2009-06-16 19:50:13 -07:00
Kconfig.debug	kmemcheck: enable in the x86 Kconfig	2009-06-15 15:49:15 +02:00
kmemcheck.c	kmemcheck: add hooks for the page allocator	2009-06-15 15:48:33 +02:00
kmemleak-test.c	kmemleak: Simple testing module for kmemleak	2009-06-11 17:04:19 +01:00
kmemleak.c	kmemleak: Protect the seq start/next/stop sequence by rcu_read_lock()	2009-07-29 12:34:58 -07:00
maccess.c	[S390] maccess: add weak attribute to probe_kernel_write	2009-06-12 10:27:37 +02:00
madvise.c	mm: madvise(): correct return code	2009-06-16 19:47:40 -07:00
Makefile	Merge branch 'akpm'	2009-06-16 19:50:13 -07:00
memcontrol.c	Fix congestion_wait() sync/async vs read/write confusion	2009-07-10 20:31:53 +02:00
memory_hotplug.c	page-allocator: reset wmark_min and inactive ratio of zone when hotplug happens	2009-06-16 19:47:42 -07:00
memory.c	mm: Pass virtual address to [__]p{te,ud,md}_free_tlb()	2009-07-27 12:10:38 -07:00
mempolicy.c	page allocator: do not check NUMA node ID when the caller knows the node is valid	2009-06-16 19:47:32 -07:00
mempool.c
migrate.c	migration: only migrate_prep() once per move_pages()	2009-06-16 19:47:41 -07:00
mincore.c	[CVE-2009-0029] System call wrappers part 14	2009-01-14 14:15:24 +01:00
mlock.c	mm: remove CONFIG_UNEVICTABLE_LRU config option	2009-06-16 19:47:42 -07:00
mm_init.c	mm: mminit_loglevel cannot be __meminitdata anymore	2008-08-20 15:40:30 -07:00
mmap.c	Merge branch 'perfcounters-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-06-11 14:01:07 -07:00
mmu_notifier.c	mmu-notifiers: core	2008-07-28 16:30:21 -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_counter: Add mmap event hooks to mprotect()	2009-06-08 23:10:43 +02:00
mremap.c	[CVE-2009-0029] System call wrappers part 13	2009-01-14 14:15:23 +01:00
msync.c	[CVE-2009-0029] System call wrappers part 13	2009-01-14 14:15:23 +01:00
nommu.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6	2009-07-01 11:46:30 -07:00
oom_kill.c	oom: only oom kill exiting tasks with attached memory	2009-06-16 19:47:45 -07:00
page_alloc.c	page-allocator: preserve PFN ordering when __GFP_COLD is set	2009-07-29 19:10:34 -07:00
page_cgroup.c	memcg: remove some redundant checks	2009-06-18 13:03:47 -07:00
page_io.c	mm: remove file argument from swap_readpage()	2009-06-16 19:47:44 -07:00
page_isolation.c	memory hotplug: fix page_zone() calculation in test_pages_isolated()	2008-11-06 15:41:19 -08:00
page-writeback.c	Fix congestion_wait() sync/async vs read/write confusion	2009-07-10 20:31:53 +02:00
pagewalk.c	pagemap: pass mm into pagewalkers	2008-06-12 18:05:41 -07:00
pdflush.c	Revert "mm: add /proc controls for pdflush threads"	2009-05-15 11:32:24 +02:00
percpu.c	x86: implement percpu_alloc kernel parameter	2009-06-22 11:56:24 +09:00
prio_tree.c
quicklist.c	cpumask: replace node_to_cpumask with cpumask_of_node.	2009-03-13 14:49:46 +10:30
readahead.c	readahead: introduce context readahead algorithm	2009-06-16 19:47:30 -07:00
rmap.c	memcg: add file-based RSS accounting	2009-06-18 13:03:47 -07:00
shmem_acl.c	switch shmem to inode->i_acl	2009-06-24 08:17:06 -04:00
shmem.c	Get "no acls for this inode" right, fix shmem breakage	2009-06-24 16:58:48 -04:00
slab.c	SLAB: Fix lockdep annotations	2009-06-29 09:57:10 +03:00
slob.c	fix RCU-callback-after-kmem_cache_destroy problem in sl[aou]b	2009-06-26 12:10:47 +03:00
slub.c	kmemleak: Trace the kmalloc_large* functions in slub	2009-07-08 14:25:14 +01:00
sparse-vmemmap.c	vmemmap: warn about page_structs with remote distance	2008-11-06 15:41:19 -08:00
sparse.c	mm: mminit_validate_memmodel_limits(): remove redundant test	2009-04-01 08:59:11 -07:00
swap_state.c	mm: remove file argument from swap_readpage()	2009-06-16 19:47:44 -07:00
swap.c	mm: fix Committed_AS underflow on large NR_CPUS environment	2009-05-02 15:36:10 -07:00
swapfile.c	memcg: fix swap accounting	2009-06-18 13:03:47 -07:00
thrash.c	mm: pass mm to grab_swap_token	2009-06-23 12:50:05 -07:00
truncate.c	mm: remove __invalidate_mapping_pages variant	2009-06-16 19:47:43 -07:00
util.c	Merge branches 'slab/documentation', 'slab/fixes', 'slob/cleanups' and 'slub/fixes' into for-linus	2009-06-17 08:30:15 +03:00
vmalloc.c	Merge branch 'for-linus' of git://linux-arm.org/linux-2.6	2009-06-11 14:15:57 -07:00
vmscan.c	Fix congestion_wait() sync/async vs read/write confusion	2009-07-10 20:31:53 +02:00
vmstat.c	vmscan: count the number of times zone_reclaim() scans and fails	2009-06-16 19:47:46 -07:00