Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: [RFC PATCH V2 4/9] perf/x86: Enable post-processing monotonic raw conversion | Date | Tue, 14 Feb 2023 21:02:23 +0100 |
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Kan!
On Mon, Feb 13 2023 at 11:07, kan liang wrote: > From: Kan Liang <kan.liang@linux.intel.com> > + } else if (perf_event_hw_time(event)) { > + struct ktime_conv mono; > + > + userpg->cap_user_time_mono_raw = 1; > + ktime_get_fast_mono_raw_conv(&mono);
What guarantees that the clocksource used by the timekeeping core is actually TSC? Nothing at all. You cannot make assumptions here.
Thanks,
tglx
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