linux-kernel - Re: [PATCH 3/3] perf target: Add need

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Date:	Wed, 16 May 2012 09:32:37 -0600
From:	David Ahern <dsahern@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	Namhyung Kim <namhyung.kim@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] perf target: Add need_mmap field

On 5/16/12 9:28 AM, Arnaldo Carvalho de Melo wrote:
> Em Wed, May 16, 2012 at 06:45:49PM +0900, Namhyung Kim escreveu:
>> If perf doesn't mmap on event (like perf stat), it
>> should not create per-task-per-cpu events. So just
>> use a dummy cpu map to create a per-task event for
>> this case.
>
> Humm, perhaps target.no_mmap is better? I.e. just perf-stat would set
> it.
>

That gets back to the potential double negation Ingo frowns upon (!no_mmap).

David
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