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SubjectRe: [PATCH v3] perf: honoring the architectural performance monitoring version
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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