linux-kernel - [PATCH] perf: Fix missing raw data on tracepoint events

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Message-Id: <20221012143857.48198-1-james.clark@arm.com>
Date:   Wed, 12 Oct 2022 15:38:57 +0100
From:   James Clark <james.clark@....com>
To:     linux-perf-users@...r.kernel.org, peterz@...radead.org,
        namhyung@...nel.org
Cc:     linux-kernel@...r.kernel.org, James Clark <james.clark@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>
Subject: [PATCH] perf: Fix missing raw data on tracepoint events

Since commit 838d9bb62d13 ("perf: Use sample_flags for raw_data")
raw data is not being output on tracepoints due to the PERF_SAMPLE_RAW
field not being set. Fix this by setting it for tracepoint events.

This fixes the following test failure:

  perf test "sched_switch" -vvv

   35: Track with sched_switch
  --- start ---
  test child forked, pid 1828
  ...
  Using CPUID 0x00000000410fd400
  sched_switch: cpu: 2 prev_tid -14687 next_tid 0
  sched_switch: cpu: 2 prev_tid -14687 next_tid 0
  Missing sched_switch events
  4613 events recorded
  test child finished with -1
  ---- end ----
  Track with sched_switch: FAILED!

Fixes: 838d9bb62d13 ("perf: Use sample_flags for raw_data")
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: James Clark <james.clark@....com>
---
 kernel/events/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index b981b879bcd8..824c23830272 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -9759,6 +9759,7 @@ void perf_tp_event(u16 event_type, u64 count, void *record, int entry_size,
 
 	perf_sample_data_init(&data, 0, 0);
 	data.raw = &raw;
+	data.sample_flags |= PERF_SAMPLE_RAW;
 
 	perf_trace_buf_update(record, event_type);
 
-- 
2.28.0