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memcg: fix zone congestion 

ZONE_CONGESTED should be a state of global memory reclaim.  If not, a busy
memcg sets this and give unnecessary throttoling in wait_iff_congested()
against memory recalim in other contexts.  This makes system performance
bad.

I'll think about "memcg is congested!" flag is required or not, later.
But this fix is required first.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Acked-by: Ying Han <yinghan@google.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Cc: Michal Hocko <mhocko@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:
KAMEZAWA Hiroyuki 2011-05-17 15:44:10 -07:00 committed by Linus Torvalds
parent d5f33d45e4
commit d6c438b6cd
1 changed files with 1 additions and 1 deletions
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2
mm/vmscan.c
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@ -937,7 +937,7 @@ keep_lumpy:
* back off and wait for congestion to clear because further reclaim
* will encounter the same problem
*/
if (nr_dirty == nr_congested && nr_dirty != 0)
if (nr_dirty && nr_dirty == nr_congested && scanning_global_lru(sc))
zone_set_flag(zone, ZONE_CONGESTED);
free_page_list(&free_pages);