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[V2,01/11] perf/x86: Fix native_perf_sched_clock_from_tsc() with __sched_clock_offset

Message ID 20220214110914.268126-2-adrian.hunter@intel.com (mailing list archive)
State New, archived
Headers show
Series perf intel-pt: Add perf event clocks to better support VM tracing | expand

Commit Message

Adrian Hunter Feb. 14, 2022, 11:09 a.m. UTC 
native_perf_sched_clock_from_tsc() is used to produce a time value that can
be consistent with perf_clock().  Consequently, it should be adjusted by
__sched_clock_offset, the same as perf_clock() would be.

Fixes: 698eff6355f735 ("sched/clock, x86/perf: Fix perf test tsc")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 arch/x86/kernel/tsc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index a698196377be..d9fe277c2471 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -242,7 +242,7 @@  u64 native_sched_clock(void)
  */
 u64 native_sched_clock_from_tsc(u64 tsc)
 {
-	return cycles_2_ns(tsc);
+	return cycles_2_ns(tsc) + __sched_clock_offset;
 }
 
 /* We need to define a real function for sched_clock, to override the