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

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Date:	Thu, 10 Jun 2010 18:38:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	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 Thu, 2010-06-10 at 18:29 +0200, Frederic Weisbecker wrote:

> Imagine you have several software and hardware events running on the
> same cpu. Each time you reset this period for a software event, you do
> a hw_pmu_disable() / hw_pmu_enable(), which writes/read the hardware
> register for each hardware events, amongst other wasteful things.

hw_perf_disable/enable() are on their way out. They should be replaced
with a struct pmu callback. We must remove all these weak functions if
we want to support multiple pmus.


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