Re: [PATCH] Perf: Correct Assumptions about Sample Timestamps inPasses

[David Ahern]

On 12/26/13, 10:14 AM, Frederic Weisbecker wrote:
> > I was carrying that patch while working on perf-kvm-stat-live last
> > Fall. It does not solve the problem for live commands, so ended up
> > dropping it and going with local (to the command) hacks. I still
> > think for live commands getting a perf_clock timestamp at the start
> > of a round and using that as the flush time will work best.
>
> Ok, but how would you fetch this perf clock timestamp, with an explicit read?

One option is exporting perf_clock to userspace.

Preferably a built-in option, https://lkml.org/lkml/2013/12/10/781, but 
I can go the module route if I have to: 
https://github.com/dsahern/linux/blob/perf-full-monty/README.ahern

David
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