linux-kernel - Re: [PATCH 2/6] add res_counter_uncharge

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Date:	Mon, 14 May 2012 10:10:39 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Han Ying <yinghan@...gle.com>,
	Glauber Costa <glommer@...allels.com>,
	Tejun Heo <tj@...nel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/6] add res_counter_uncharge_until()

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

> On Fri, 11 May 2012 18:47:06 +0900
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
> 
>> From: Frederic Weisbecker <fweisbec@...il.com>
>>
>> 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@...fujitsu.com>
> 
> 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.

Thanks,
-Kame


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