linux-kernel - Re: [PATCH 1/5] perf: Provide a proper stop action for software events

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Date:	Sat, 12 Jun 2010 11:43:11 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 1/5] perf: Provide a proper stop action for software
 events

On Sat, 2010-06-12 at 09:34 +0200, Frederic Weisbecker wrote:
> In order to introduce new context exclusions, software events will
> have to eventually stop when needed. We'll want perf_event_stop() to
> act on every events.
> 
> To achieve this, remove the stub stop/start pmu callbacks of software
> and tracepoint events that fixed a race in perf_adjust_period, and do
> an explicit check to only reset the hardware event using the
> start/stop callbacks.

I really object to this,. its just too ugly to live.
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