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>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 8d2e5c8..3ba72e6 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -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;