linux-kernel - Re: [PATCH] Add hierarchical accounting to cpu accounting controller

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Message-ID: <6599ad830810230849x71961a0asd7f00d3baa2f2271@mail.gmail.com>
Date:	Thu, 23 Oct 2008 08:49:19 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	bharata@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org,
	"Srivatsa Vaddagiri" <vatsa@...ux.vnet.ibm.com>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Ingo Molnar" <mingo@...e.hu>
Subject: Re: [PATCH] Add hierarchical accounting to cpu accounting controller

On Wed, Oct 22, 2008 at 10:43 PM, Bharata B Rao
<bharata@...ux.vnet.ibm.com> wrote:
> ---
>  kernel/sched.c |   30 ++++++++++++++++++++++++------
>  1 file changed, 24 insertions(+), 6 deletions(-)
>
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -9131,10 +9131,15 @@ struct cpuacct {
>        struct cgroup_subsys_state css;
>        /* cpuusage holds pointer to a u64-type object on every cpu */
>        u64 *cpuusage;
> +       struct cpuacct *parent;
>  };
>
> +static struct cpuacct init_cpuacct_group;

Why are you making the root state static?

>  struct cgroup_subsys cpuacct_subsys;
>
> +#define for_each_cpuacct_group(ca) \
> +               for (; ca; ca = ca->parent)
> +

This is only used once, so doesn't seem worth creating a new macro for.

>
> +       if (cgrp->parent) {
> +               ca->css.cgroup = cgrp;

The cgroup pointer in the css is maintained by cgroups - you don't
need to set it.

Paul
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