On Fri, 11 May 2012 18:47:06 +0900
KAMEZAWA Hiroyuki [off-list ref] wrote:

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.
 - Fixed 'From' , this patch comes from his series. Please signed-off-by if good.

Signed-off-by: KAMEZAWA Hiroyuki <redacted>

Frederic's Signed-off-by: is unavaliable?

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