Messages in this thread | | | Date | Thu, 26 Dec 2013 10:24:03 -0500 | From | David Ahern <> | Subject | Re: [PATCH] Perf: Correct Assumptions about Sample Timestamps in Passes |
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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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