From: David Rientjes <rientjes@google.com>
Date: Wed, 4 Jun 2014 23:08:31 +0000 (-0700)
Subject: mm, compaction: terminate async compaction when rescheduling
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~56^2~16^2~135
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aeef4b83806f49a0c454b7d4578671b71045bee2;p=pandora-kernel.git

mm, compaction: terminate async compaction when rescheduling

Async compaction terminates prematurely when need_resched(), see
compact_checklock_irqsave().  This can never trigger, however, if the
cond_resched() in isolate_migratepages_range() always takes care of the
scheduling.

If the cond_resched() actually triggers, then terminate this pageblock
scan for async compaction as well.

Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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