On Thu, 28 Jun 2012, Kamezawa Hiroyuki wrote:

For handling many kinds of races, memcg adds an extra charge to
page's memcg at page migration. But this affects the page compaction
and make it fail if the memcg is under OOM.

This patch uses res_counter_charge_nofail() in page migration path
and remove -ENOMEM. By this, page migration will not fail by the
status of memcg.

Reported-by: David Rientjes <rientjes@google.com>
Signed-off-by: KAMEZAWA Hiroyuki <redacted>

Acked-by: David Rientjes <rientjes@google.com>

This is a very good improvement for page migration under memory compaction 
and increases the liklihood that it will do useful work for transparent 
hugepage allocations, thanks!

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