linux-kernel - Re: [PATCH 3/5] perf: Ability to enable in a paused mode

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Date:	Sat, 12 Jun 2010 11:44:26 +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 3/5] perf: Ability to enable in a paused mode

On Sat, 2010-06-12 at 09:34 +0200, Frederic Weisbecker wrote:
>  struct pmu {
>         int (*enable)                   (struct perf_event *event);
> +       /*
> +        * Reserve acts like enable, except the event must go in a "pause"
> +        * state. Ie: it is scheduled but waiting to be started
> +        * with the ->start() callback.
> +        */
> +       int (*reserve)                  (struct perf_event *event);
>         void (*disable)                 (struct perf_event *event); 

Urgh, so then we have, enable(), reserve() and start(), that's just too
much. Also, you need to visit all pmu implementations if you touch
struct pmu like that.
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