linux-kernel - Re: [PATCH] perf top: Fix a race in callchain handling

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Message-ID: <20120511150111.GA2485@infradead.org>
Date:	Fri, 11 May 2012 12:01:11 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Namhyung Kim <namhyung.kim@....com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] perf top: Fix a race in callchain handling

Em Fri, May 11, 2012 at 11:10:59AM +0900, Namhyung Kim escreveu:
> On Mon, 07 May 2012 10:32:22 +0900, Namhyung Kim wrote:
> > I thought about it before, but it still cannot protect it from accessing
> > a hists by multiple concurrent threads. IOW if two threads call the
> > function to a same hists at the same time, ->callchain_collapse_cursor
> > would still get the race problem - so crashed.
> >
> > I guess callchain_cursor should be thread-local, eventually. No need to
> > make it hist-local IMHO.
> 
> So, any thoughts?

Can you try writing a patch using TLS?

- Arnaldo
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