linux-kernel - Re: perf: h/w counters not counted and no error/info reported to user

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Message-ID: <20110527095036.GK21386@elte.hu>
Date:	Fri, 27 May 2011 11:50:36 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Ahern <dsahern@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: perf: h/w counters not counted and no error/info reported to user


* David Ahern <dsahern@...il.com> wrote:

> By default (tip-perf-core) perf-stat enables a number of H/W counters:
> 
> perf stat  -- sleep 1

did you mean to do 'perf stat -a sleep 1' ?

'perf stat sleep 1' in itself will only measure that very simple 
command - which does not do much.

Thanks,

	Ingo
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