linux-kernel - Re: Q: perf_install_in_context/perf_event

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Message-ID: <1296124337.15234.71.camel@laptop>
Date:	Thu, 27 Jan 2011 11:32:17 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Stern <stern@...land.harvard.edu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	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_install_in_context/perf_event_enable are racy?

On Wed, 2011-01-26 at 22:33 +0100, Oleg Nesterov wrote:
> 
> This is what I had in mind initially but I didn't dare to add the
> new member into rq, it is only needed for perf. 

Right, but its a weakness in the task_oncpu_function_call()
implementation, wouldn't any user run into this problem eventually?
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