On Tue, Jun 23, 2009 at 10:26 AM, Paul Mackerras<pau...@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? ------------------------------------------------------------------------------ Are you an open source citizen? Join us for the Open Source Bridge conference! Portland, OR, June 17-19. Two days of sessions, one day of unconference: $250. Need another reason to go? 24-hour hacker lounge. Register today! http://ad.doubleclick.net/clk;215844324;13503038;v?http://opensourcebridge.org _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
