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

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Date:	Tue, 27 Sep 2011 23:52:24 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Glauber Costa <glommer@...allels.com>
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 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?

> +       }


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