Michal Hocko c5d01d0d18 mm, compaction: simplify __alloc_pages_direct_compact feedback interface
__alloc_pages_direct_compact communicates potential back off by two
variables:
	- deferred_compaction tells that the compaction returned
	  COMPACT_DEFERRED
	- contended_compaction is set when there is a contention on
	  zone->lock resp. zone->lru_lock locks

__alloc_pages_slowpath then backs of for THP allocation requests to
prevent from long stalls. This is rather messy and it would be much
cleaner to return a single compact result value and hide all the nasty
details into __alloc_pages_direct_compact.

This patch shouldn't introduce any functional changes.

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>
2016-05-20 17:58:30 -07:00
..
2015-11-05 19:34:48 -08:00
2015-06-24 17:49:45 -07:00
2016-03-17 15:09:34 -07:00
2016-03-25 16:37:42 -07:00
2016-03-17 15:09:34 -07:00
2015-09-08 15:35:28 -07:00
2016-01-21 17:20:51 -08:00
2016-03-17 15:09:34 -07:00
2015-11-05 19:34:48 -08:00
2016-03-17 15:09:34 -07:00
2016-03-25 16:37:42 -07:00
2016-05-19 19:12:14 -07:00
2016-05-05 17:38:53 -07:00