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authorMel Gorman <mel@csn.ul.ie>2010-09-09 16:38:18 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2010-09-26 17:18:40 -0700
commit39f7a62c0d15eb8b489a707778e9c8c30d7f4d5d (patch)
tree760052574a1ff2be56a10e8b5fb56224119eaf99 /mm
parent221d4da7cbe3a3a66d2adc0d7bb91a1d92d8c0bb (diff)
downloadlwn-39f7a62c0d15eb8b489a707778e9c8c30d7f4d5d.tar.gz
lwn-39f7a62c0d15eb8b489a707778e9c8c30d7f4d5d.zip
mm: page allocator: drain per-cpu lists after direct reclaim allocation fails
commit 9ee493ce0a60bf42c0f8fd0b0fe91df5704a1cbf upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 9bd339eb04c6..66008d7eeb86 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1843,6 +1843,7 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
struct page *page = NULL;
struct reclaim_state reclaim_state;
struct task_struct *p = current;
+ bool drained = false;
cond_resched();
@@ -1861,14 +1862,25 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
cond_resched();
- if (order != 0)
- drain_all_pages();
+ if (unlikely(!(*did_some_progress)))
+ return NULL;
- if (likely(*did_some_progress))
- page = get_page_from_freelist(gfp_mask, nodemask, order,
+retry:
+ page = get_page_from_freelist(gfp_mask, nodemask, order,
zonelist, high_zoneidx,
alloc_flags, preferred_zone,
migratetype);
+
+ /*
+ * If an allocation failed after direct reclaim, it could be because
+ * pages are pinned on the per-cpu lists. Drain them and try again
+ */
+ if (!page && !drained) {
+ drain_all_pages();
+ drained = true;
+ goto retry;
+ }
+
return page;
}