linux-kernel - Re: [PATCH 01/23] perf record: Add --all-user/--all-kernel options

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Date:	Wed, 17 Feb 2016 07:31:07 -0800
From:	Andi Kleen <ak@...ux.intel.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 01/23] perf record: Add --all-user/--all-kernel options

On Wed, Feb 17, 2016 at 11:26:16AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Feb 16, 2016 at 07:10:37PM -0800, Andi Kleen escreveu:
> > > Need to investigate why there are kernel samples when --all-user is used and
> > > the other way around as well.
> 
> > This is a known issue due to skid. PEBS usually avoids it.
> 
> Right, thanks for pointing this out, we have to detect that :p is not
> being used and warn the user about this possibility, i.e. user asks for
> just kernel samples, tool finds user samples, tell that using :p+ may
> help.

If you're really so worried about it the kernel driver could filter it.

-Andi