linux-kernel - Re: [PATCH 1/2] perf_events: add cgroup support (v8)

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Date:	Thu, 20 Jan 2011 15:39:05 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	eranian@...gle.com
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	davem@...emloft.net, fweisbec@...il.com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com,
	robert.richter@....com, acme@...hat.com, lizf@...fujitsu.com,
	Paul Menage <menage@...gle.com>
Subject: Re: [PATCH 1/2] perf_events: add cgroup support (v8)

On Thu, 2011-01-20 at 15:30 +0200, Stephane Eranian wrote:
> @@ -4259,8 +4261,20 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks)
>  
>         /* Reassign the task to the init_css_set. */
>         task_lock(tsk);
> +       /*
> +        * we mask interrupts to prevent:
> +        * - timer tick to cause event rotation which
> +        *   could schedule back in cgroup events after
> +        *   they were switched out by perf_cgroup_sched_out()
> +        *
> +        * - preemption which could schedule back in cgroup events
> +        */
> +       local_irq_save(flags);
> +       perf_cgroup_sched_out(tsk);
>         cg = tsk->cgroups;
>         tsk->cgroups = &init_css_set;
> +       perf_cgroup_sched_in(tsk);
> +       local_irq_restore(flags);
>         task_unlock(tsk);
>         if (cg)
>                 put_css_set_taskexit(cg); 

So you too need a callback on cgroup change there.. Li, Paul, any chance
we can fix this cgroup_subsys::exit callback? The scheduler code needs
to do funny thing because its in the wrong place as well.
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