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    SubjectRe: [RFC PATCH 5/6] bpf: Implement function bpf_read_pmu() that get the selected hardware PMU conuter
    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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