Re: [tip:perf/urgent] perf_events: Fix time tracking for events withpid != -1 and cpu != -1

[Lin Ming]

>
> perf_events: Fix time tracking for events with pid != -1 and cpu != -1

Hi,

I thought pid != -1 and cpu != -1 is not valid.

# perf top -p 23268 -C 1
WARNING: PID switch overriding CPU

In which case this could be valid?

Thanks,
Lin Ming

>
> Per-thread events with a cpu filter, i.e., cpu != -1, were not
> reporting correct timings when the thread never ran on the
> monitored cpu. The time enabled was reported as a negative
> value.
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