linux-kernel - Re: [RFD 3/9] Display /proc/stat information per cgroup

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Date:	Wed, 28 Sep 2011 12:15:52 -0300
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: [RFD 3/9] Display /proc/stat information per cgroup

On 09/27/2011 06:52 PM, Peter Zijlstra wrote:
> On Fri, 2011-09-23 at 19:20 -0300, Glauber Costa wrote:
>> +       root_task_group.cpustat = alloc_percpu(struct kernel_stat);
>> +       /* Failing that early an allocation means we're screwed anyway */
>> +       BUG_ON(!root_task_group.cpustat);
>> +       for_each_possible_cpu(i) {
>> +               kstat = per_cpu_ptr(root_task_group.cpustat, i);
>> +               kstat->cpustat[IDLE] = 0;
>> +               kstat->cpustat[IDLE_BASE] = 0;
>> +               kstat->cpustat[IOWAIT_BASE] = 0;
>> +               kstat->cpustat[IOWAIT] = 0;
>
> so alloc_percpu() will actually zero your memory for you, which you rely
> on for all other fields as well, so why reset these ones?

Just to be style-consistent with the non-root initialization, in which 
we actually put values on that. But I can easily remove it.

>
>> +       }
>
>

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