linux-kernel - Re: [PATCH] perf: ARM: Record the user-mode PC in the call chain.

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Message-ID: <20130618131319.GC6801@mudshark.cambridge.arm.com>
Date:	Tue, 18 Jun 2013 14:13:19 +0100
From:	Will Deacon <will.deacon@....com>
To:	Jed Davis <jld@...illa.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf: ARM: Record the user-mode PC in the call chain.

On Fri, Jun 14, 2013 at 12:21:11AM +0100, Jed Davis wrote:
> With this change, we no longer lose the innermost entry in the user-mode
> part of the call chain.  See also the x86 port, which includes the ip.
> 
> It's possible to partially work around this problem by post-processing
> the data to use the PERF_SAMPLE_IP value, but this works only if the CPU
> wasn't in the kernel when the sample was taken.

Thanks. I guess we need something similar for arm64 too. Could you cook a
similar patch please?

Will
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