mm: page_alloc: do not cache reclaim distances
authorMel Gorman <mgorman@suse.de>
Wed, 4 Jun 2014 23:07:15 +0000 (16:07 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 4 Jun 2014 23:53:59 +0000 (16:53 -0700)
commit5f7a75acdb24c7b9c436b3a0a66eec12e101d19c
tree09bb84ff22ba1de0b19f403242b78bd2d35e24ce
parent4f9b16a64753d0bb607454347036dc997fd03b82
mm: page_alloc: do not cache reclaim distances

pgdat->reclaim_nodes tracks if a remote node is allowed to be reclaimed
by zone_reclaim due to its distance.  As it is expected that
zone_reclaim_mode will be rarely enabled it is unreasonable for all
machines to take a penalty.  Fortunately, the zone_reclaim_mode() path
is already slow and it is the path that takes the hit.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/mmzone.h
mm/page_alloc.c