Messages in this thread Patch in this message | | | Date | Mon, 27 Feb 2012 18:33:51 +0100 | From | Stephane Eranian <> | Subject | [PATCH] perf tools: fix guest mode monitoring on AMD |
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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.
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) {
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