On Fri, Jul 17, 2015 at 01:55:05PM +0200, Peter Zijlstra wrote: > 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).
Scratch that from NMI, for that to work we need more magic still. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
