linux-kernel - Re: [RFC PATCH 2/9] perf: Add ability to dump user regs

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Message-ID: <20101013145757.GD5335@nowhere>
Date:	Wed, 13 Oct 2010 16:58:00 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Robert Richter <robert.richter@....com>,
	David Miller <davem@...emloft.net>
Subject: Re: [RFC PATCH 2/9] perf: Add ability to dump user regs

On Wed, Oct 13, 2010 at 09:20:53AM +0200, Peter Zijlstra wrote:
> On Wed, 2010-10-13 at 07:06 +0200, Frederic Weisbecker wrote:
> > Add new PERF_SAMPLE_UREGS to perf sample type. This will dump the
> > user space context as it was before the user entered the kernel for
> > whatever reason.
> > 
> > This is going to be useful to bring Dwarf CFI based stack unwinding
> > on top of samples.
> 
> This doesn't address any of the issues that were raised previously.
> 
> There's a reason we don't have PERF_SAMPLE_*REGS like things.
> 
> See: http://lkml.org/lkml/2010/3/3/308


But the best would be to get it from sysfs I think.

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