Re: [RFC][PATCH 3/7 v2] res_counter: add res_counter_uncharge_until()

[Glauber Costa <glommer@parallels.com>]

On 04/27/2012 02:53 AM, KAMEZAWA Hiroyuki wrote:
>  From bb0168d5c85f62f36434956e4728a67d0cc41e55 Mon Sep 17 00:00:00 2001
> From: KAMEZAWA Hiroyuki<kamezawa.hiroyu@jp.fujitsu.com>
> Date: Thu, 26 Apr 2012 18:48:07 +0900
> Subject: [PATCH 3/9] memcg: add res_counter_uncharge_until()
> 
> 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)
> 
> This ops is atomic and more efficient.
> 
> Originaly-written-by: Frederic Weisbecker<fweisbec@gmail.com>
> Signed-off-by: KAMEZAWA Hiroyuki<kamezawa.hiroyu@jp.fujitsu.com>
I have been carrying Frederic's patch itself in my code for a while now.

Why not just use it? What are you doing differently to justify writing a
patch yourself? It's a bit of credit giving as well

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