linux-kernel - Re: [PATCH] perf: Set filters before mmaping events

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Message-ID: <20110302084925.GA21204@elte.hu>
Date:	Wed, 2 Mar 2011 09:49:25 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] perf: Set filters before mmaping events


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> We currently set the filters after we mmap the events, this is a
> race that let undesired events record themselves in the buffer before
> we had the time to set the filters.
> 
> So set the filters before they can be recorded. That also librarizes
> the filters setting so that filtering can be done more easily
> from other tools than perf record later.
> 
> (PS: This should fix most of the bugs Ingo has reported
> about filters that weren't working with perf).

Nice!

Mind pulling Steve's filter-enhancements branch and sending a pull request for the 
whole thing? Steve's branch was:

  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git tip/perf/filter

( Or your fixes could be applied to Steve's branch as well - whichever direction you 
  guys prefer - the important thing is to have filtering tested and validated as a 
  whole. )

Thanks,

	Ingo
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