diff options
| author | Namhyung Kim <namhyung@kernel.org> | 2022-07-01 23:54:58 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-07-02 15:22:26 +0300 |
| commit | ff898552fb32d255517fb0676f9fa500664c484d (patch) | |
| tree | 9a8bd64164f33f9a8bd0272083f0fbb9c48ee653 | |
| parent | 363afa3aef24f5e08df6a539f5dc3aae4cddcc1a (diff) | |
| download | linux-ff898552fb32d255517fb0676f9fa500664c484d.tar.xz | |
perf synthetic-events: Ignore dead threads during event synthesis
When it synthesize various task events, it scans the list of task
first and then accesses later. There's a window threads can die
between the two and proc entries may not be available.
Instead of bailing out, we can ignore that thread and move on.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20220701205458.985106-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/util/synthetic-events.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c index a068f42833c3..84d17bd4efae 100644 --- a/tools/perf/util/synthetic-events.c +++ b/tools/perf/util/synthetic-events.c @@ -767,11 +767,12 @@ static int __event__synthesize_thread(union perf_event *comm_event, if (*end) continue; - rc = -1; + /* some threads may exit just after scan, ignore it */ if (perf_event__prepare_comm(comm_event, pid, _pid, machine, &tgid, &ppid, &kernel_thread) != 0) - break; + continue; + rc = -1; if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid, ppid, process, machine) < 0) break; |