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Mel Gorman 5dab29113c mm: page_alloc: take the ALLOC_NO_WATERMARK check out of the fast path 
ALLOC_NO_WATERMARK is set in a few cases.  Always by kswapd, always for
__GFP_MEMALLOC, sometimes for swap-over-nfs, tasks etc.  Each of these
cases are relatively rare events but the ALLOC_NO_WATERMARK check is an
unlikely branch in the fast path.  This patch moves the check out of the
fast path and after it has been determined that the watermarks have not
been met.  This helps the common fast path at the cost of making the slow
path slower and hitting kswapd with a performance cost.  It's a reasonable
tradeoff.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Jan Kara <jack@suse.cz>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-04 16:54:09 -07:00
..
backing-dev.c
arch: Mass conversion of smp_mb__*()
2014-04-18 14:20:48 +02:00
balloon_compaction.c
mm: print more details for bad_page()
2014-01-23 16:36:50 -08:00
bootmem.c
mm/bootmem.c: remove unused local `map'
2013-11-13 12:09:09 +09:00
cleancache.c
mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE
2014-01-23 16:36:50 -08:00
compaction.c
mm/compaction: avoid rescanning pageblocks in isolate_freepages
2014-06-04 16:54:07 -07:00
debug-pagealloc.c
mm, x86: Remove debug_pagealloc_enabled
2011-12-06 09:24:07 +01:00
dmapool.c
mm/dmapool.c: reuse devres_release() to free resources
2014-06-04 16:54:08 -07:00
early_ioremap.c
mm: create generic early_ioremap() support
2014-04-07 16:36:15 -07:00
fadvise.c
teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long
2013-03-03 22:46:22 -05:00
failslab.c
switch debugfs to umode_t
2012-01-03 22:54:56 -05:00
filemap_xip.c
seqcount: Add lockdep functionality to seqcount/seqlock structures
2013-11-06 12:40:26 +01:00
filemap.c
fs/mpage.c: factor page_endio() out of mpage_end_io()
2014-06-04 16:54:02 -07:00
fremap.c
mm: softdirty: make freshly remapped file pages being softdirty unconditionally
2014-06-04 16:53:56 -07:00
frontswap.c
swap: change swap_list_head to plist, add swap_avail_head
2014-06-04 16:54:07 -07:00
gup.c
mm: cleanup __get_user_pages()
2014-06-04 16:54:05 -07:00
highmem.c
Some nice cleanups, and even a patch my wife did as a "live" demo for
2012-12-20 08:37:05 -08:00
huge_memory.c
mm/huge_memory.c: complete conversion to pr_foo()
2014-06-04 16:53:58 -07:00
hugetlb_cgroup.c
cgroup: drop const from @buffer of cftype->write_string()
2014-03-19 10:23:54 -04:00
hugetlb.c
hugetlb: add support for gigantic page allocation at runtime
2014-06-04 16:53:59 -07:00
hwpoison-inject.c
mm/hwpoison: add '#' to hwpoison_inject
2014-01-21 16:19:48 -08:00
init-mm.c
atomic: use <linux/atomic.h>
2011-07-26 16:49:47 -07:00
internal.h
mm: fold mlocked_vma_newpage() into its only call site
2014-06-04 16:54:07 -07:00
interval_tree.c
mm: add CONFIG_DEBUG_VM_RB build option
2012-10-09 16:22:42 +09:00
iov_iter.c
take iov_iter stuff to mm/iov_iter.c
2014-04-01 23:19:30 -04:00
Kconfig
hugetlb: restrict hugepage_migration_support() to x86_64
2014-06-04 16:53:51 -07:00
Kconfig.debug
mm: more intensive memory corruption debugging
2012-01-10 16:30:42 -08:00
kmemcheck.c
…
kmemleak-test.c
…
kmemleak.c
mem-hotplug: implement get/put_online_mems
2014-06-04 16:53:59 -07:00
ksm.c
mm: close PageTail race
2014-03-04 07:55:47 -08:00
list_lru.c
mm: keep page cache radix tree nodes in check
2014-04-03 16:21:01 -07:00
maccess.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
madvise.c
mm: madvise: fix MADV_WILLNEED on shmem swapouts
2014-05-23 09:37:29 -07:00
Makefile
mm: move get_user_pages()-related code to separate file
2014-06-04 16:54:04 -07:00
memblock.c
mm/memblock.c: use PFN_DOWN
2014-06-04 16:54:02 -07:00
memcontrol.c
memcg: cleanup kmem cache creation/destruction functions naming
2014-06-04 16:54:08 -07:00
memory_hotplug.c
mm, migration: add destination page freeing callback
2014-06-04 16:54:06 -07:00
memory-failure.c
mm, migration: add destination page freeing callback
2014-06-04 16:54:06 -07:00
memory.c
mm: move get_user_pages()-related code to separate file
2014-06-04 16:54:04 -07:00
mempolicy.c
mm, migration: add destination page freeing callback
2014-06-04 16:54:06 -07:00
mempool.c
mm/mempool: warn about __GFP_ZERO usage
2014-06-04 16:53:58 -07:00
migrate.c
mm, migration: add destination page freeing callback
2014-06-04 16:54:06 -07:00
mincore.c
mm + fs: prepare for non-page entries in page cache radix trees
2014-04-03 16:21:00 -07:00
mlock.c
mm: try_to_unmap_cluster() should lock_page() before mlocking
2014-04-07 16:35:57 -07:00
mm_init.c
mm: bring back /sys/kernel/mm
2014-01-27 21:02:39 -08:00
mmap.c
mm/mmap.c: remove the first mapping check
2014-06-04 16:54:01 -07:00
mmu_context.c
sched/mm: call finish_arch_post_lock_switch in idle_task_exit and use_mm
2014-02-21 08:50:17 +01:00
mmu_notifier.c
mm: audit/fix non-modular users of module_init in core code
2014-01-23 16:36:52 -08:00
mmzone.c
mm: numa: Change page last {nid,pid} into {cpu,pid}
2013-10-09 14:47:45 +02:00
mprotect.c
mm: move mmu notifier call from change_protection to change_pmd_range
2014-04-07 16:35:50 -07:00
mremap.c
mm, thp: close race between mremap() and split_huge_page()
2014-05-11 17:55:48 +09:00
msync.c
…
nobootmem.c
mm/nobootmem.c: mark function as static
2014-04-03 16:21:02 -07:00
nommu.c
mm: fix 'ERROR: do not initialise globals to 0 or NULL' and coding style
2014-04-07 16:35:55 -07:00
oom_kill.c
mm, oom: base root bonus on current usage
2014-01-30 16:56:56 -08:00
page_alloc.c
mm: page_alloc: take the ALLOC_NO_WATERMARK check out of the fast path
2014-06-04 16:54:09 -07:00
page_cgroup.c
mm/page_cgroup.c: mark functions as static
2014-04-03 16:21:02 -07:00
page_io.c
swap: use bdev_read_page() / bdev_write_page()
2014-06-04 16:54:02 -07:00
page_isolation.c
mm: memory-hotplug: enable memory hotplug to handle hugepage
2013-09-11 15:57:48 -07:00
page-writeback.c
mm: replace __get_cpu_var uses with this_cpu_ptr
2014-06-04 16:54:03 -07:00
pagewalk.c
mm/pagewalk.c: fix walk_page_range() access of wrong PTEs
2013-10-30 14:27:03 -07:00
percpu-km.c
…
percpu-vm.c
mm: fix kernel-doc warnings
2012-06-20 14:39:36 -07:00
percpu.c
percpu: make pcpu_alloc_chunk() use pcpu_mem_free() instead of kfree()
2014-04-14 16:18:06 -04:00
pgtable-generic.c
mm: fix TLB flush race between migration, and change_protection_range
2013-12-18 19:04:51 -08:00
process_vm_access.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2014-04-12 14:49:50 -07:00
quicklist.c
mm: delete various needless include <linux/module.h>
2011-10-31 09:20:11 -04:00
readahead.c
mm/readahead.c: inline ra_submit
2014-04-07 16:35:58 -07:00
rmap.c
mm: fold mlocked_vma_newpage() into its only call site
2014-06-04 16:54:07 -07:00
shmem.c
mm: Initialize error in shmem_file_aio_read()
2014-04-13 14:10:26 -07:00
slab_common.c
slab: delete cache from list after __kmem_cache_shutdown succeeds
2014-06-04 16:54:08 -07:00
slab.c
memcg, slab: merge memcg_{bind,release}_pages to memcg_{un}charge_slab
2014-06-04 16:54:01 -07:00
slab.h
memcg, slab: merge memcg_{bind,release}_pages to memcg_{un}charge_slab
2014-06-04 16:54:01 -07:00
slob.c
slab: get_online_mems for kmem_cache_{create,destroy,shrink}
2014-06-04 16:53:59 -07:00
slub.c
mm: replace __get_cpu_var uses with this_cpu_ptr
2014-06-04 16:54:03 -07:00
sparse-vmemmap.c
mm/sparse: use memblock apis for early memory allocations
2014-01-21 16:19:47 -08:00
sparse.c
mm: use macros from compiler.h instead of __attribute__((...))
2014-04-07 16:35:54 -07:00
swap_state.c
swap: add a simple detector for inappropriate swapin readahead
2014-02-06 13:48:51 -08:00
swap.c
mm: introdule compound_head_by_tail()
2014-06-04 16:54:03 -07:00
swapfile.c
swap: change swap_list_head to plist, add swap_avail_head
2014-06-04 16:54:07 -07:00
truncate.c
mm: filemap: update find_get_pages_tag() to deal with shadow entries
2014-05-06 13:04:59 -07:00
util.c
nick kvfree() from apparmor
2014-05-06 14:02:53 -04:00
vmacache.c
mm,vmacache: optimize overflow system-wide flushing
2014-06-04 16:53:57 -07:00
vmalloc.c
mm/vmalloc.c: replace seq_printf by seq_puts
2014-06-04 16:54:04 -07:00
vmpressure.c
arm, pm, vmpressure: add missing slab.h includes
2014-02-03 13:24:01 -05:00
vmscan.c
mm: shrinker: add nid to tracepoint output
2014-06-04 16:54:04 -07:00
vmstat.c
mm: use the light version __mod_zone_page_state in mlocked_vma_newpage()
2014-06-04 16:54:07 -07:00
workingset.c
mm: keep page cache radix tree nodes in check
2014-04-03 16:21:01 -07:00
zbud.c
mm/zbud: fix some trivial typos in comments
2013-09-11 15:57:35 -07:00
zsmalloc.c
mm: replace __get_cpu_var uses with this_cpu_ptr
2014-06-04 16:54:03 -07:00
zswap.c
Merge branch 'akpm' (incoming from Andrew)
2014-04-07 16:38:06 -07:00