Messages in this thread | | | Date | Mon, 27 Feb 2012 19:39:00 +0200 | From | Gleb Natapov <> | Subject | Re: [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.
| |