On Mon, May 14, 2012 at 07:32:42PM +0900, KAMEZAWA Hiroyuki wrote:

[PATCH 2/6] memcg: add res_counter_uncharge_until()

From: Frederic Weisbecker <redacted>

At killing res_counter which is a child of other counter,
we need to do
	res_counter_uncharge(child, xxx)
	res_counter_charge(parent, xxx)

This is not atomic and wasting cpu. This patch adds
res_counter_uncharge_until(). This function's uncharge propagates
to ancestors until specified res_counter.

	res_counter_uncharge_until(child, parent, xxx)

Now, ops is atomic and efficient.

Changelog since v2
 - removed unnecessary lines.
 - added 'From' , this patch comes from his one.

Signed-off-by: Frederic Weisbecker <redacted>
Signed-off-by: KAMEZAWA Hiroyuki <redacted>

Acked-by: Tejun Heo <redacted>

Thanks.

-- 
tejun