tree c599f3139026f7d674f99824f80625bd5328ad8c
parent 75f30861a12a6b09b759dfeeb9290b681af89057
author David Rientjes <rientjes@google.com> 1401923311 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1401926047 -0700

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>