On Thu, Feb 19, 2015 at 4:11 AM, Adrian Hunter <adrian.hun...@intel.com> wrote: > Hi > > With the advent of switching perf_clock to CLOCK_MONOTONIC, > it will not be possible to convert perf_clock directly to/from > TSC. So add the ability to sample TSC instead. > > > Adrian Hunter (2): > perf: Sample additional clock value > perf/x86: Provide TSC for PERF_SAMPLE_CLOCK_ARCH
This doesn't seem very portable. The CLOCK_MONOTONIC_RAW clockid was added to provide a arch-neutral abstraction of a free-running hardware counter that isn't affected by adjtimex slewing (though like any counter, it will be affected by non-constant drift). You might consider looking at that if the short term slew adjustments (which result in more accurate timings in the long term) are problematic for you. thanks -john -- 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/
