linux-kernel - Re: [RFC][PATCH 09/11] perf: Default PMU ops

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Message-ID: <20100629182139.GD11967@nowhere>
Date:	Tue, 29 Jun 2010 20:21:41 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	paulus <paulus@...ba.org>,
	stephane eranian <eranian@...glemail.com>,
	Robert Richter <robert.richter@....com>,
	Will Deacon <will.deacon@....com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Yanmin <yanmin_zhang@...ux.intel.com>,
	Deng-Cheng Zhu <dengcheng.zhu@...il.com>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 09/11] perf: Default PMU ops

On Tue, Jun 29, 2010 at 08:19:03PM +0200, Peter Zijlstra wrote:
> On Tue, 2010-06-29 at 20:11 +0200, Frederic Weisbecker wrote:
> > On Tue, Jun 29, 2010 at 08:09:10PM +0200, Peter Zijlstra wrote:
> > > On Tue, 2010-06-29 at 20:07 +0200, Frederic Weisbecker wrote:
> > > > On Tue, Jun 29, 2010 at 06:34:10PM +0200, Peter Zijlstra wrote:
> > > > > On Tue, 2010-06-29 at 17:03 +0200, Frederic Weisbecker wrote:
> > > > > > > You mean, if (!pmu->start_txn && pmu->pmu_enable) { /* install defaults
> > > > > > > */ } ?
> > > 
> > > > neglected pmu implementations shouldn't impact software pmus.
> > > 
> > > With the above and not providing ->pmu_enable you get that.
> > 
> > 
> > But we don't need to provide a pmu_enable for software events, right?
> 
> My point exactly.


Which I understand late. Agreed.

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