linux-kernel - Re: callchain sampling bug in perf?

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Date:	Sun, 22 Aug 2010 07:20:14 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: callchain sampling bug in perf?

On Sat, Aug 21, 2010 at 10:46:25AM -0400, Christoph Hellwig wrote:
> On Sat, Aug 21, 2010 at 10:42:39AM -0400, Christoph Hellwig wrote:
> > It does seem to fix the bug for some cases but not all.  Default perf
> > report in TUI and the normal command line seem to get it right.  perf
> > report -g flat still shows the old problem.  perf report -g flat,0.0
> > shows callgraphs, but just as before they just show the 0.<n>
> > percentages.
> 
> -g graph also shows the same issue of not beeing able to expand the
> python line.  It seems like only the fractal case was fixed by that
> patch.
> 


Now does it work with the patch in attachment?
It includes the previous one.

It still needs a few cleanups but the idea is there.
Ah and it applies in tip:perf/core but latest -linus
should be fine.

Thanks.



View attachment "callchain.diff" of type "text/x-diff" (2958 bytes)