Messages in this thread |  | | Date | Tue, 23 Jun 2009 10:30:53 +0200 | Subject | Re: I.2 - Grouping | From | stephane eranian <> |
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On Tue, Jun 23, 2009 at 10:26 AM, Paul Mackerras<paulus@samba.org> wrote: > 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. > Okay. Thanks.
But that leads me to another question related to grouping which was hinted for by Peter's comment about IBS.
Can you have multiple sampling events in a group? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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