linux-kernel - Re: [PATCH 04/10] Display /proc/stat information per cgroup

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Message-ID: <4E8C494F.8020804@parallels.com>
Date:	Wed, 5 Oct 2011 16:10:55 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	<linux-kernel@...r.kernel.org>, <paul@...lmenage.org>,
	<lizf@...fujitsu.com>, <daniel.lezcano@...e.fr>,
	<jbottomley@...allels.com>
Subject: Re: [PATCH 04/10] Display /proc/stat information per cgroup

On 10/05/2011 12:56 PM, Peter Zijlstra wrote:
> On Sun, 2011-10-02 at 23:21 +0400, Glauber Costa wrote:
>> +struct kernel_stat *task_group_kstat(struct task_struct *p)
>> +{
>> +       struct task_group *tg;
>> +       struct kernel_stat *kstat;
>> +
>> +       rcu_read_lock();
>> +       tg = task_group(p);
>> +       kstat = tg->cpustat;
>> +       rcu_read_unlock();
>> +       return kstat;
>> +}
>
> Who keeps tg alive and kicking while you poke at its (cpustat) member?

* All calls to this function currently pass current as a parameter 
(Okay, maybe it is too generic and we should pass nothing at all, and 
grab current within it)
* rcu_read_lock() guarantees that current will exist during this call, 
and task_group won't change. (right?)


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