diff options
| author | Michal Hocko <mhocko@suse.com> | 2016-05-20 16:56:50 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-20 17:58:30 -0700 |
| commit | 4f9a358c36fcdad3ea1db263ec4d484a70ad543e (patch) | |
| tree | d8ea980b35a3731dc0653136447cc082ecc6e964 /include/linux/compaction.h | |
| parent | c8f7de0bfae36e8532e5e25a39d15407f02aca78 (diff) | |
mm, compaction: update compaction_result ordering
compaction_result will be used as the primary feedback channel for
compaction users. At the same time try_to_compact_pages (and
potentially others) assume a certain ordering where a more specific
feedback takes precendence.
This gets a bit awkward when we have conflicting feedback from different
zones. E.g one returing COMPACT_COMPLETE meaning the full zone has been
scanned without any outcome while other returns with COMPACT_PARTIAL aka
made some progress. The caller should get COMPACT_PARTIAL because that
means that the compaction still can make some progress. The same
applies for COMPACT_PARTIAL vs COMPACT_PARTIAL_SKIPPED.
Reorder PARTIAL to be the largest one so the larger the value is the
more progress we have done.
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/compaction.h')
| -rw-r--r-- | include/linux/compaction.h | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/include/linux/compaction.h b/include/linux/compaction.h index 9b37f9d3f7a8..ff39fa0a1ede 100644 --- a/include/linux/compaction.h +++ b/include/linux/compaction.h @@ -4,6 +4,8 @@ /* Return values for compact_zone() and try_to_compact_pages() */ /* When adding new states, please adjust include/trace/events/compaction.h */ enum compact_result { + /* For more detailed tracepoint output - internal to compaction */ + COMPACT_NOT_SUITABLE_ZONE, /* * compaction didn't start as it was not possible or direct reclaim * was more suitable @@ -11,30 +13,34 @@ enum compact_result { COMPACT_SKIPPED, /* compaction didn't start as it was deferred due to past failures */ COMPACT_DEFERRED, + /* compaction not active last round */ COMPACT_INACTIVE = COMPACT_DEFERRED, + /* For more detailed tracepoint output - internal to compaction */ + COMPACT_NO_SUITABLE_PAGE, /* compaction should continue to another pageblock */ COMPACT_CONTINUE, + /* - * direct compaction partially compacted a zone and there are suitable - * pages + * The full zone was compacted scanned but wasn't successfull to compact + * suitable pages. */ - COMPACT_PARTIAL, + COMPACT_COMPLETE, /* * direct compaction has scanned part of the zone but wasn't successfull * to compact suitable pages. */ COMPACT_PARTIAL_SKIPPED, + + /* compaction terminated prematurely due to lock contentions */ + COMPACT_CONTENDED, + /* - * The full zone was compacted scanned but wasn't successfull to compact - * suitable pages. + * direct compaction partially compacted a zone and there might be + * suitable pages */ - COMPACT_COMPLETE, - /* For more detailed tracepoint output */ - COMPACT_NO_SUITABLE_PAGE, - COMPACT_NOT_SUITABLE_ZONE, - COMPACT_CONTENDED, + COMPACT_PARTIAL, }; /* Used to signal whether compaction detected need_sched() or lock contention */ |