linux-kernel - Re: perf

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Message-ID: <20100611210405.GC5234@nowhere>
Date:	Fri, 11 Jun 2010 23:04:06 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	paulus <paulus@...ba.org>,
	stephane eranian <eranian@...glemail.com>,
	Robert Richter <robert.richter@....com>,
	Will Deacon <will.deacon@....com>,
	Paul Mundt <lethal@...ux-sh.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: perf_disable()

On Fri, Jun 11, 2010 at 06:29:44PM +0200, Peter Zijlstra wrote:
> There is a fun little recursion issue with perf_adjust_period(), where
> if we fully removed perf_disable() we could end up calling pmu::stop()
> twice and such.



We can have a local_t made nesting level on the stop/start that could easily
deal with this.

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