Messages in this thread | | | Date | Tue, 23 Jun 2009 18:26:29 +1000 | From | Paul Mackerras <> | Subject | Re: I.2 - Grouping |
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stephane eranian writes:
> What happens if I do: > fd0 = perf_counter_open(&hwc1, getpid(), -1, -1, 0); > fd1 = perf_counter_open(&hwc2, getpid(), -1, fd0, 0); > > And then: > fd2 = perf_counter_open(&hwc2, getpid(), -1, fd1, 0);
That perf_counter_open call will fail with an EINVAL error because fd1 is not a group leader.
Paul.
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