The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 892ba7f18621a02af4428c58d97451f64685dba4 Mon Sep 17 00:00:00 2001
From: Namhyung Kim namhyung@kernel.org Date: Tue, 29 Jun 2021 21:30:58 -0700 Subject: [PATCH] perf report: Fix --task and --stat with pipe input
Current 'perf report' fails to process a pipe input when --task or --stat options are used. This is because they reset all the tool callbacks and fails 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 occurs. 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 #
Committer testing:
Before:
$ perf record -o- sleep 1 | perf report -i- --stat Can't parse sample, err = -14 [ perf record: Woken up 1 times to write data ] 0x1350 [0x30]: failed to process type: 9 Error: failed to process sample [ perf record: Captured and wrote 0.000 MB - ] $
After:
$ perf record -o- sleep 1 | perf report -i- --stat [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.000 MB - ]
Aggregated stats: TOTAL events: 41 COMM events: 2 ( 4.9%) EXIT events: 1 ( 2.4%) SAMPLE events: 9 (22.0%) MMAP2 events: 4 ( 9.8%) ATTR events: 1 ( 2.4%) FINISHED_ROUND events: 1 ( 2.4%) THREAD_MAP events: 1 ( 2.4%) CPU_MAP events: 1 ( 2.4%) EVENT_UPDATE events: 1 ( 2.4%) TIME_CONV events: 1 ( 2.4%) FEATURE events: 19 (46.3%) cycles:uhH stats: SAMPLE events: 9 $
Fixes: a4a4d0a7a2b20f78 ("perf report: Add --stats option to display quick data statistics") Signed-off-by: Namhyung Kim namhyung@kernel.org Acked-by: Jiri Olsa jolsa@redhat.com Tested-by: Arnaldo Carvalho de Melo acme@redhat.com Cc: Andi Kleen ak@linux.intel.com Cc: Ian Rogers irogers@google.com Cc: Peter Zijlstra peterz@infradead.org Link: http://lore.kernel.org/lkml/20210630043058.1131295-1-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com
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;