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authorMel Gorman <mgorman@techsingularity.net>2016-05-19 17:14:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-19 19:12:14 -0700
commit4741526b83c5d3a3d661d1896f9e7414c5730bcb (patch)
treedd8f5b4f6a8be7fc321fce60462b669f4a30f75d
parent4e6118016eb7986109ad61b00186579f384f956a (diff)
mm, page_alloc: restore the original nodemask if the fast path allocation failed
The page allocator fast path uses either the requested nodemask or cpuset_current_mems_allowed if cpusets are enabled. If the allocation context allows watermarks to be ignored then it can also ignore memory policies. However, on entering the allocator slowpath the nodemask may still be cpuset_current_mems_allowed and the policies are enforced. This patch resets the nodemask appropriately before entering the slowpath. Link: http://lkml.kernel.org/r/20160504143628.GU2858@techsingularity.net Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/page_alloc.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ecf663358b0d..5c469c1dfb8b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3636,6 +3636,12 @@ retry_cpuset:
alloc_mask = memalloc_noio_flags(gfp_mask);
ac.spread_dirty_pages = false;
+ /*
+ * Restore the original nodemask if it was potentially replaced with
+ * &cpuset_current_mems_allowed to optimize the fast-path attempt.
+ */
+ if (cpusets_enabled())
+ ac.nodemask = nodemask;
page = __alloc_pages_slowpath(alloc_mask, order, &ac);
no_zone: