Re: [RFC PATCH] perf: honoring cpuid for number of fixed counters

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH] perf: honoring cpuid for number of fixed counters
Date	2015-06-04 13:50 +0200
Message-ID	<pxBON-8al-3@gated-at.bofh.it> (permalink)
References	<pxbUl-3be-1@gated-at.bofh.it> <pxcno-3Pz-13@gated-at.bofh.it> <pxAJ4-6By-13@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Jun 04, 2015 at 12:35:08PM +0200, Imre Palik wrote:
> On 06/03/15 10:36, Peter Zijlstra wrote:
> > Further, the Intel Arch PerfMon v2 spec actually specifies there to be 3
> > fixed function counters.
> > 
> > So anything that says it is v2+ and does not have the 3, is non
> > compliant.
> >
> > I would suggest you go fix your hypervisor.
> 
> If I set up the hypervisor to advertise Arch PerfMon v1 (0 fixed
> counters), then  without my patch, perf still tries to use fixed
> counters.  So something is clearly broken here.

So the code you deleted does if (version > 1), and last I checked that
should return false if version == 1.

So please check what's happening there first.
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Re: [RFC PATCH] perf: honoring cpuid for number of fixed counters Imre Palik <imrep.amz@gmail.com> - 2015-06-04 12:40 +0200
  Re: [RFC PATCH] perf: honoring cpuid for number of fixed counters Peter Zijlstra <peterz@infradead.org> - 2015-06-04 13:50 +0200

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