linux-kernel - Re: [PATCH RFC] Fix per-task profiling Re: [PATCH] perf: Allow set output buffer for tasks in the same thread group

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Message-ID: <20110427160701.GC7807@ghostprotocols.net>
Date:	Wed, 27 Apr 2011 13:07:01 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, Tim Blechmann <tim@...ngt.org>,
	David Ahern <dsahern@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] Fix per-task profiling Re: [PATCH] perf: Allow set
 output buffer for tasks in the same thread group

Em Wed, Apr 27, 2011 at 10:40:46AM +0800, Lin Ming escreveu:
> Tested and it works OK.

Thanks!
 
> But here is one thing make me confused.
> I thought that "--pid" and "--cpu" parameters are not allowed to be used
> at the same time. Otherwise, is it a task event or cpu event?
 
> Or does it mean that the event is only monitored when the "task" is
> running on the specified "cpu"?

This is an excellent question, my expectation is that it works as you
describe, but Documentation/perf/design.txt doesn't cover the case of
cpu != -1 and pid != -1, reading code...

- Arnaldo
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