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

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Date:	Tue, 29 Jun 2010 16:57:53 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
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, 2010-06-29 at 16:49 +0200, Frederic Weisbecker wrote:
> > +static void perf_pmu_start_txn(struct pmu *pmu)
> > +{
> > +     perf_pmu_disable(pmu);
> > +}
> > +
> > +static int perf_pmu_commit_txn(struct pmu *pmu)
> > +{
> > +     perf_pmu_enable(pmu);
> > +     return 0;
> > +}
> > +
> > +static void perf_pmu_cancel_txn(struct pmu *pmu)
> > +{
> > +     perf_pmu_enable(pmu);
> 
> 
> Did you mean disable here? 

Nope, start_txn() will disable the pmu, both commit_txn and cancel_txn
can be used to close the transaction and should thus enable the pmu
again.


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