Messages in this thread | | | Date | Fri, 17 Jul 2015 13:55:05 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH 5/6] bpf: Implement function bpf_read_pmu() that get the selected hardware PMU conuter |
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On Fri, Jul 17, 2015 at 07:45:02PM +0800, Wangnan (F) wrote:
> >Depends on what all you need, if you need full perf events to work then > >yes perf_event_read_value() is your only option. > > > >But note that that requires scheduling, so you cannot actually use it > >for tracing purposes etc..
> What you mean "full perf events"? Even with your code some event still not > work?
The code I posted only works for events that do not have inherit set. And only works from IRQ/NMI context for events that monitor the current task or the current CPU (although that needs a little extra code still).
Anything else and it does not work (correctly).
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