Messages in this thread | | | Subject | Re: [PATCH] perf_counter: Start counting time enabled when group leader gets enabled | From | Peter Zijlstra <> | Date | Tue, 25 Aug 2009 09:21:28 +0200 |
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On Tue, 2009-08-25 at 15:17 +1000, Paul Mackerras wrote: > Currently, if a group is created where the group leader is initially > disabled but a non-leader member is initially enabled, and then the > leader is subsequently enabled some time later, the time_enabled for > the non-leader member will reflect the whole time since it was created, > not just the time since the leader was enabled. This is incorrect, > because all of the members are effectively disabled while the leader > is disabled, since none of the members can go on the PMU if the leader > can't. > > Thus we have to update the ->tstamp_enabled for all the enabled group > members when a group leader is enabled, so that the time_enabled > computation only counts the time since the leader was enabled. > Similarly, when disabling a group leader we have to update the > time_enabled and time_running for all of the group members. > Also, in update_counter_times, we have to treat a counter whose group > leader is disabled as being disabled. > > Reported-by: Stephane Eranian <eranian@googlemail.com> > Signed-off-by: Paul Mackerras <paulus@samba.org>
Looks good, thanks Paul!
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