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

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Date:   Tue, 18 Oct 2022 22:23:00 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     James Clark <james.clark@....com>
Cc:     linux-perf-users@...r.kernel.org, namhyung@...nel.org,
        linux-kernel@...r.kernel.org, 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: Re: [PATCH] perf: Fix missing raw data on tracepoint events

On Wed, Oct 12, 2022 at 03:38:57PM +0100, James Clark wrote:
> 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>

Thanks!