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Date: Tue, 29 Jun 2010 20:21:41 +0200
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: paulus <paulus@samba.org>, stephane eranian <eranian@googlemail.com>,
       Robert Richter <robert.richter@amd.com>,
       Will Deacon <will.deacon@arm.com>, Paul Mundt <lethal@linux-sh.org>,
       Cyrill Gorcunov <gorcunov@gmail.com>, Lin Ming <ming.m.lin@intel.com>,
       Yanmin <yanmin_zhang@linux.intel.com>,
       Deng-Cheng Zhu <dengcheng.zhu@gmail.com>,
       David Miller <davem@davemloft.net>, linux-kernel@vger.kernel.org
Subject: Re: [RFC][PATCH 09/11] perf: Default PMU ops
Message-ID: <20100629182139.GD11967@nowhere>
References: <20100624142804.431553874@chello.nl> <20100624143406.993794468@chello.nl> <20100629145806.GE5318@nowhere> <1277823591.1868.43.camel@laptop> <20100629150305.GG5318@nowhere> <1277829250.1868.46.camel@laptop> <20100629180745.GA11967@nowhere> <1277834950.1868.56.camel@laptop> <20100629181104.GC11967@nowhere> <1277835543.1868.57.camel@laptop>
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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.