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authorVlastimil Babka <vbabka@suse.cz>2016-10-08 03:00:31 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-10-08 04:46:28 +0300
commitd943649831aba0fcdda37a0e9e25b332a634cf5e (patch)
treedb3c779c262e057badc1dbff2004f45666e79a32 /kernel/module.c
parent3250845d0526407330592dd43b9f1354b6fe7a14 (diff)
downloadlinux-d943649831aba0fcdda37a0e9e25b332a634cf5e.tar.xz
mm, compaction: more reliably increase direct compaction priority
During reclaim/compaction loop, compaction priority can be increased by the should_compact_retry() function, but the current code is not optimal. Priority is only increased when compaction_failed() is true, which means that compaction has scanned the whole zone. This may not happen even after multiple attempts with a lower priority due to parallel activity, so we might needlessly struggle on the lower priorities and possibly run out of compaction retry attempts in the process. After this patch we are guaranteed at least one attempt at the highest compaction priority even if we exhaust all retries at the lower priorities. Link: http://lkml.kernel.org/r/20160906135258.18335-3-vbabka@suse.cz Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Cc: Michal Hocko <mhocko@kernel.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: David Rientjes <rientjes@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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