Messages in this thread | | | Subject | Re: [BUG] perf_events: PERF_FORMAT_GROUP not working correctly when monitoring another task | From | Peter Zijlstra <> | Date | Thu, 06 May 2010 22:22:40 +0200 |
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On Thu, 2010-05-06 at 13:09 -0700, Corey Ashford wrote: > The patch works with the test case I provided, but for some reason it > breaks the normal operation of the libpfm4 "task" utility. If I put > more than one event in a group, I get zero counts on all but the first > event. That's even if I don't use the PERF_FORMAT_GROUP option.
Bugger,.. weird though, I can't see how it would affect the state before the counters get detached from their context (exit() / close()).
> So something appears to be messed up. I will see if I can construct an > arch-independent test case which demonstrates the problem.
That would be awesome, thanks!
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