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memcg: hierarchy avoid unnecessary reclaim 

If hierarchy is not used, no tree-walk is necessary.

Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daisuke Nishimura 2009-01-07 18:08:13 -08:00 committed by Linus Torvalds
parent a7fe942e94
commit 670ec2f170
1 changed files with 2 additions and 0 deletions
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2
mm/memcontrol.c
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@ -606,6 +606,8 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
ret = try_to_free_mem_cgroup_pages(root_mem, gfp_mask, noswap);
if (mem_cgroup_check_under_limit(root_mem))
return 0;
if (!root_mem->use_hierarchy)
return ret;
next_mem = mem_cgroup_get_first_node(root_mem);