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memcg: don't trigger oom at page migration 

I think triggering OOM at mem_cgroup_prepare_migration would be just a bit
overkill.  Returning -ENOMEM would be enough for
mem_cgroup_prepare_migration.  The caller would handle the case anyway.

Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.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 18:08:28 -08:00 committed by Linus Torvalds
parent 9836d89191
commit 3bb4edf24b
1 changed files with 1 additions and 1 deletions
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2
mm/memcontrol.c
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@ -1361,7 +1361,7 @@ int mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr)
unlock_page_cgroup(pc);
if (mem) {
ret = mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem);
ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false);
css_put(&mem->css);
}
*ptr = mem;