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

From: KAMEZAWA Hiroyuki
Date: Sun May 13 2012 - 21:12:33 EST

(2012/05/12 6:19), Andrew Morton wrote:

> On Fri, 11 May 2012 18:47:06 +0900
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
>> From: Frederic Weisbecker <fweisbec@xxxxxxxxx>
>> 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 <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> Frederic's Signed-off-by: is unavaliable?

I didn't add his Signed-off because I modified his orignal patch a little...
I dropped res_counter_charge_until() because it's not used in this series,
I have no justification for adding it.
The idea of res_counter_uncharge_until() is from his patch.


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