linux-kernel - Re: perf not capturing stack traces

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Message-ID: <20150124151204.GF3073@kernel.org>
Date:	Sat, 24 Jan 2015 12:12:04 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Felipe Balbi <balbi@...com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Tony Lindgren <tony@...mide.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>
Subject: Re: perf not capturing stack traces

Em Fri, Jan 23, 2015 at 04:37:45PM -0600, Felipe Balbi escreveu:
> On Fri, Jan 23, 2015 at 05:59:59PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Fri, Jan 23, 2015 at 01:51:28PM -0600, Felipe Balbi escreveu:
> > > I'm using v3.19-rc5 on an ARM Cortex A9 board. Unfortunately, perf is
> > > not able to capture any stack traces even though I CONFIG_STACKTRACE,
> > > CONFIG_FRAME_POINTER and CONFIG_ARM_UNWIND all enabled.
> > > 
> > > I wonder if anybody else is facing similar issues.
> > 
> > Did it work with a previous kernel?
> 
> haven't checked with this board. First time I tried to use perf for
> anything.

And it is the first time I've heard about such a problem, not dealing
with ARM myself, so I guess this is a case for looking if there was some
previous kernel where this worked, then trying to bisect where the
problem was introduced :-\

- Arnaldo
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