linux-kernel - Re: [PATCH 1/2] perf: Add persistent event facilities

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Date:	Fri, 18 May 2012 12:00:33 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Borislav Petkov <bp@...64.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: [PATCH 1/2] perf: Add persistent event facilities

On Wed, 2012-03-21 at 15:34 +0100, Borislav Petkov wrote:
> @@ -6319,6 +6332,10 @@ __perf_event_exit_task(struct perf_event *child_event,
>                 raw_spin_unlock_irq(&child_ctx->lock);
>         }
>  
> +       /* do not remove persistent events on task exit */
> +       if (child_event->attr.persistent)
> +               return;
> +
>         perf_remove_from_context(child_event);
>  

Huh, the task it dying, why would you let the event stay in the task
context?
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