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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>
This commit is contained in:
David Rientjes 2014-06-04 16:08:31 -07:00 committed by Linus Torvalds
parent 75f30861a1
commit aeef4b8380
1 changed files with 6 additions and 1 deletions
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7
mm/compaction.c
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@ -494,8 +494,13 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
return 0;
}
if (cond_resched()) {
/* Async terminates prematurely on need_resched() */
if (cc->mode == MIGRATE_ASYNC)
return 0;
}
/* Time to isolate some pages for migration */
cond_resched();
for (; low_pfn < end_pfn; low_pfn++) {
/* give a chance to irqs before checking need_resched() */
if (locked && !(low_pfn % SWAP_CLUSTER_MAX)) {