linux-kernel - Re: [PATCH V5 1/6] perf, x86: use the PEBS auto reload mechanism when possible

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Message-ID: <20150330140256.GM24151@twins.programming.kicks-ass.net>
Date:	Mon, 30 Mar 2015 16:02:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Kan Liang <kan.liang@...el.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, acme@...radead.org,
	eranian@...gle.com, andi@...stfloor.org
Subject: Re: [PATCH V5 1/6] perf, x86: use the PEBS auto reload mechanism
 when possible

On Mon, Mar 30, 2015 at 02:06:07PM +0200, Peter Zijlstra wrote:
> On Mon, Feb 23, 2015 at 09:25:51AM -0500, Kan Liang wrote:
> > +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
> > @@ -673,6 +673,8 @@ void intel_pmu_pebs_enable(struct perf_event *event)
> >  	struct hw_perf_event *hwc = &event->hw;
> >  
> >  	hwc->config &= ~ARCH_PERFMON_EVENTSEL_INT;
> > +	if (!event->attr.freq)
> > +		hwc->flags |= PERF_X86_EVENT_AUTO_RELOAD;
> >  
> >  	cpuc->pebs_enabled |= 1ULL << hwc->idx;
> 
> Why not in x86_pmu_event_init()? This is not something that will change,
> ever, right?

intel_pmu_hw_config() would be the better place, as said in a later
email.
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