diff options
| author |   David Rientjes <rientjes@google.com> | 2014-06-04 16:08:31 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2014-06-04 16:54:07 -0700 |
| commit | aeef4b83806f49a0c454b7d4578671b71045bee2 (patch) | |
| tree | c599f3139026f7d674f99824f80625bd5328ad8c /mm/compaction.c | |
| parent | mm, thp: avoid excessive compaction latency during fault (diff) | |
| download | linux-dev-aeef4b83806f49a0c454b7d4578671b71045bee2.tar.xz linux-dev-aeef4b83806f49a0c454b7d4578671b71045bee2.zip | |
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>
Diffstat (limited to 'mm/compaction.c')
| -rw-r--r-- | mm/compaction.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index 217a6ad9a20e..56331f5124ba 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -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)) { |