linux-kernel - perf timechart segfault

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Message-ID: <20101024162302.GA5586@sucs.org>
Date:	Sun, 24 Oct 2010 17:23:02 +0100
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: perf timechart segfault

Hi,

I've run into a couple of issues using perf timechart:

1. (On 2.6.36) If I issue
   echo 0 > /proc/sys/kernel/perf_event_paranoid
   as root before running
   perf timechart record echo
   as a normal user the following is printed:

   Fatal: Permission error - are you root?
  	 Consider tweaking /proc/sys/kernel/perf_event_paranoid.

   Shouldn't it just say it needs root permissions for a timechart
   record?

2. (On -tip) Running
   perf timechart record echo
   outputs
   invalid or unsupported event: 'power:power_start'
   Run 'perf list' for a list of valid events

3. (On 2.6.36) I can't seem to convince timechart to ever capture more
   than 34000 samples. When trying to record using
   perf timechart record -fga sleep 10
   and then creating a graph using perf timechart, it only ever outputs
   a few seconds worth.

-- 
Sitsofe | http://sucs.org/~sits/
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