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perf/x86: Add a native_perf_sched_clock_from_tsc()
PEBSv3 has a raw TSC time stamp in its memory buffer that later needs to to be converted to perf_clock. Add a native_sched_clock_from_tsc() that works the same as native_sched_clock(), but starts with an already given TSC value. Paravirt is ignored, it will just get the native clock. But there isn't a para virtualized PEBS anyway. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: eranian@google.com Link: http://lkml.kernel.org/r/1431285767-27027-2-git-send-email-andi@firstfloor.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -51,6 +51,7 @@ extern int unsynchronized_tsc(void);
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extern int check_tsc_unstable(void);
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extern int check_tsc_disabled(void);
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extern unsigned long native_calibrate_tsc(void);
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extern unsigned long long native_sched_clock_from_tsc(u64 tsc);
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extern int tsc_clocksource_reliable;
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@ -296,6 +296,14 @@ u64 native_sched_clock(void)
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return cycles_2_ns(tsc_now);
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}
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/*
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* Generate a sched_clock if you already have a TSC value.
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*/
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u64 native_sched_clock_from_tsc(u64 tsc)
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{
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return cycles_2_ns(tsc);
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}
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/* We need to define a real function for sched_clock, to override the
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weak default version */
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#ifdef CONFIG_PARAVIRT
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