[PATCH V2 2/6] perf/x86/intel/pebs: Fix PEBS timestamps overwritten

From: kan . liang
Date: Thu Sep 01 2022 - 09:12:59 EST


From: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>

The PEBS TSC-based timestamps do not appear correctly in the final
perf.data output file from perf record.

The data->time field setup by PEBS in the setup_pebs_fixed_sample_data()
is later overwritten by perf_events generic code in
perf_prepare_sample(). There is an ordering problem.

Set the sample flags when the data->time is updated by PEBS.
The data->time field will not be overwritten anymore.

Reported-by: Andreas Kogler <andreas.kogler.0x@xxxxxxxxx>
Reported-by: Stephane Eranian <eranian@xxxxxxxxxx>
Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
---
arch/x86/events/intel/ds.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index de1f55d51784..01cbe26225c2 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -1643,8 +1643,10 @@ static void setup_pebs_fixed_sample_data(struct perf_event *event,
* We can only do this for the default trace clock.
*/
if (x86_pmu.intel_cap.pebs_format >= 3 &&
- event->attr.use_clockid == 0)
+ event->attr.use_clockid == 0) {
data->time = native_sched_clock_from_tsc(pebs->tsc);
+ data->sample_flags |= PERF_SAMPLE_TIME;
+ }

if (has_branch_stack(event))
data->br_stack = &cpuc->lbr_stack;
@@ -1705,8 +1707,10 @@ static void setup_pebs_adaptive_sample_data(struct perf_event *event,
perf_sample_data_init(data, 0, event->hw.last_period);
data->period = event->hw.last_period;

- if (event->attr.use_clockid == 0)
+ if (event->attr.use_clockid == 0) {
data->time = native_sched_clock_from_tsc(basic->tsc);
+ data->sample_flags |= PERF_SAMPLE_TIME;
+ }

/*
* We must however always use iregs for the unwinder to stay sane; the
--
2.35.1