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authorMel Gorman <mel@csn.ul.ie>2010-09-10 03:38:18 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-09-10 05:57:25 +0400
commit9ee493ce0a60bf42c0f8fd0b0fe91df5704a1cbf (patch)
tree8dbdbf3d053281291ddc6ebe50d5d0afb5ce22d7 /fs/minix
parentaa45484031ddee09b06350ab8528bfe5b2c76d1c (diff)
downloadlinux-9ee493ce0a60bf42c0f8fd0b0fe91df5704a1cbf.tar.xz
mm: page allocator: drain per-cpu lists after direct reclaim allocation fails
When under significant memory pressure, a process enters direct reclaim and immediately afterwards tries to allocate a page. If it fails and no further progress is made, it's possible the system will go OOM. However, on systems with large amounts of memory, it's possible that a significant number of pages are on per-cpu lists and inaccessible to the calling process. This leads to a process entering direct reclaim more often than it should increasing the pressure on the system and compounding the problem. This patch notes that if direct reclaim is making progress but allocations are still failing that the system is already under heavy pressure. In this case, it drains the per-cpu lists and tries the allocation a second time before continuing. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Christoph Lameter <cl@linux.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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