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Re: [PATCH] trace: extend trace_clock to support arch_arm clock counter

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On Fri, Dec 02, 2016 at 01:44:55PM +0530, Srinivas Ramana wrote:
> Extend the trace_clock to support the arch timer cycle
> counter so that we can get the monotonic cycle count
> in the traces. This will help in correlating the traces with the
> timestamps/events in other subsystems in the soc which share
> this common counter for driving their timers.

I'm not sure I follow this reasoning. What's wrong with nanoseconds? In
particular, the "perf" trace_clock hangs off sched_clock, which should
be backed by the architected counter anyway. What does the cycle counter in
isolation tell you, given that the frequency isn't architected?

I think I'm missing something here.

Will

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[PATCH] trace: extend trace_clock to support arch_arm clock counter Srinivas Ramana <sramana@codeaurora.org> - 2016-12-02 09:20 +0100
  Re: [PATCH] trace: extend trace_clock to support arch_arm clock  counter Will Deacon <will.deacon@arm.com> - 2016-12-02 12:10 +0100
    Re: [PATCH] trace: extend trace_clock to support arch_arm clock counter Srinivas Ramana <sramana@codeaurora.org> - 2016-12-04 09:40 +0100
      Re: [PATCH] trace: extend trace_clock to support arch_arm clock  counter Will Deacon <will.deacon@arm.com> - 2016-12-06 13:30 +0100

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