Re: Drop WARN on AMD lack of perfctrs

From: Borislav Petkov
Date: Fri May 17 2013 - 05:46:04 EST

On Fri, May 17, 2013 at 11:27:41AM +0200, Peter Zijlstra wrote:
> But not all x86 hardware even has the stuff enumerated in CPUID, and
> afaict Intel and AMD use a different CPUID bit as well, so what's
> init_hw_perf_events() to do?

Yeah, I think the best solution would be if we force-enable the CPUID
bit on F10h very early and teach amd_pmu_init() to look at it. I even
had a patch which does something like that. I could dust it off and give
it a try... I just hope we can actually enable a reserved bit in CPUID.



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