On 05/03/2011 01:37 PM, Jan Kiszka wrote:
>
> Yes. Unfortunately that is very vendor and model specific. The
> architectural PMU is supported, but that is only available on Intel.
Is it supposed to have any practical value already? I did not yet find a
magic -cpu switch to let Linux detect anything, not to speak of perf or
watchdog support.
On the guest side it is supported for the watchdog
(arch/x86/kernel/cpu/perfctr-watchdog.c, look for
X86_FEATURE_ARCH_PERFMON). It's also mentioned in perf_event_intel.c,
but I don't know if it will work without the other PMU features being
present.
>
> Perhaps we could emulate the architectural PMU on AMD as well, and make
> the detection code in the guest vendor agnostic. Since it's based on a
> cpuid bit, it should be safe.
>
We may only make Linux happy this way, no?
I would argue that if a feature is discoverable by a cpuid bit it
shouldn't need to be qualified by vendor. No idea how other OSes work
this out (or even if they make use of the architectural PMU).
--
error compiling committee.c: too many arguments to function
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