linux-kernel - Re: [RFC][PATCH 3/7 v2] res_counter: add res_counter_uncharge

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Date:	Sat, 28 Apr 2012 08:51:11 +0900
From:	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>
To:	Glauber Costa <glommer@...allels.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"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>,
	Tejun Heo <tj@...nel.org>, Han Ying <yinghan@...gle.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH 3/7 v2] res_counter: add res_counter_uncharge_until()

On Sat, Apr 28, 2012 at 2:08 AM, Glauber Costa <glommer@...allels.com> wrote:
> On 04/27/2012 02:53 AM, KAMEZAWA Hiroyuki wrote:
>>  From bb0168d5c85f62f36434956e4728a67d0cc41e55 Mon Sep 17 00:00:00 2001
>> From: KAMEZAWA Hiroyuki<kamezawa.hiroyu@...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@...il.com>
>> Signed-off-by: KAMEZAWA Hiroyuki<kamezawa.hiroyu@...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

I don't need "charge" part for my purpose and have no justification to add it.
And task-limit cgroup has no justification, either.

Thanks,
-Kame
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