linux-kernel - Re: [PATCH] perf report: Fix --task and --stat with pipe input

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Date:   Fri, 2 Jul 2021 12:38:09 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH] perf report: Fix --task and --stat with pipe input

On Tue, Jun 29, 2021 at 09:30:58PM -0700, Namhyung Kim wrote:
> Current perf report fails to process a pipe input when --task
> or --stat option is used.  This is because they reset all the
> tool callbacks and failed to find a matching event for a sample.
> 
> When pipe input is used, the event info is passed via ATTR records
> so it needs to handle that operation.  Otherwise the following error
> occurred.  Note, -14 (= -EFAULT) comes from evlist__parse_sample():
> 
>   # perf record -a -o- sleep 1 | perf report -i- --stat
>   Can't parse sample, err = -14
>   0x271044 [0x38]: failed to process type: 9
>   Error:
>   failed to process sample
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> ---
>  tools/perf/builtin-report.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index bc5c393021dc..8639bbe0969d 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -729,9 +729,14 @@ static int count_sample_event(struct perf_tool *tool __maybe_unused,
>  	return 0;
>  }
>  
> +static int process_attr(struct perf_tool *tool __maybe_unused,
> +			union perf_event *event,
> +			struct evlist **pevlist);
> +
>  static void stats_setup(struct report *rep)
>  {
>  	memset(&rep->tool, 0, sizeof(rep->tool));
> +	rep->tool.attr = process_attr;
>  	rep->tool.sample = count_sample_event;
>  	rep->tool.no_warn = true;
>  }
> @@ -753,6 +758,7 @@ static void tasks_setup(struct report *rep)
>  		rep->tool.mmap = perf_event__process_mmap;
>  		rep->tool.mmap2 = perf_event__process_mmap2;
>  	}
> +	rep->tool.attr = process_attr;
>  	rep->tool.comm = perf_event__process_comm;
>  	rep->tool.exit = perf_event__process_exit;
>  	rep->tool.fork = perf_event__process_fork;
> -- 
> 2.32.0.93.g670b81a890-goog
>