Messages in this thread | | | Date | Tue, 16 Jun 2015 11:21:36 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v3] perf: honoring the architectural performance monitoring version |
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On Mon, Jun 15, 2015 at 04:22:32PM +0200, Imre Palik wrote: > From: "Palik, Imre" <imrep@amazon.de> > > Architectural performance monitoring version 1 doesn't support fixed > counters. Currently, even if a hypervisor advertises support for > architectural performance monitoring version 1, perf may still tries to use > the fixed counters, as the constraints are set up based on the CPU model. > > This patch ensures that perf honors the architectural performance > monitoring version returned by CPUID, and it only uses the fixed counters > for version two and above. > > Some of the ideas in this patch are coming from Peter Zijlstra.
What's the difference from -v2? I'm not really seeing it.
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