linux-kernel - Re: Q: perf_event && event->owner

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Message-ID: <1289248872.2191.27.camel@laptop>
Date:	Mon, 08 Nov 2010 21:41:12 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Prasad <prasad@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Q: perf_event && event->owner

On Mon, 2010-11-08 at 21:11 +0100, Frederic Weisbecker wrote:
> Perhaps the real owner should be the task on which we attach our
> breakpoint.

No the point of event->owner is to point to the task that creates the
event, not the task we possibly attach it to (that should be reachable
through event->ctx->task).

As to removing event->owner as Oleg suggests, its a published ABI and
there might be people using it.

The use-case is a monitor thread wanting to stop all monitoring it
initiated, for example because its wants to synchronize various counters
attached to different tasks etc..

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