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SubjectRe: [PATCH] perf tools: fix guest mode monitoring on AMD
On Mon, Feb 27, 2012 at 06:33:51PM +0100, Stephane Eranian wrote:
> Commit:
>
> 1aed267 perf kvm: Do guest-only counting by default
>
> introduced a bug on AMD systems whereby simple commands:
>
> $ perf stat ls
> Performance counter stats for 'ls':
> 0 cycles # 0.000 GHz
> 0.003704596 seconds time elapsed
>
> would not count anything anymore. Same results for perf record.
>
> I tracked it down to guest mode exclusion being enabled
> by default leading to attr->exclude_guest = 1. When
> not operating under any sort of virtualization, this
> causes the PMU not to count anything.
CCing Joerg. I think he fixed this or similar problem recently.

>
> The fix disables guest exclusion by default.
>
> Signed-off-by: Stephane Eranian <eranian@google.com>
> ---
>
> diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
> index 8109a90..c1017b3 100644
> --- a/tools/perf/util/util.c
> +++ b/tools/perf/util/util.c
> @@ -6,7 +6,7 @@
> * XXX We need to find a better place for these things...
> */
> bool perf_host = true;
> -bool perf_guest = false;
> +bool perf_guest = true;
>
> void event_attr_init(struct perf_event_attr *attr)
> {

--
Gleb.


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