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

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

[Namhyung Kim]

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@kernel.org>
---
 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

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

[Jiri Olsa]

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@kernel.org>

Acked-by: Jiri Olsa <jolsa@redhat.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
> 

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

[Arnaldo Carvalho de Melo]

Em Fri, Jul 02, 2021 at 12:38:09PM +0200, Jiri Olsa escreveu:
> 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@kernel.org>
> 
> Acked-by: Jiri Olsa <jolsa@redhat.com>

Added this for the the benefit of stable@kernel.org:

Fixes: a4a4d0a7a2b20f78 ("perf report: Add --stats option to display quick data statistics")
 
> 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
> > 
> 

-- 

- Arnaldo