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perf synthetic-events: Ignore dead threads during event synthesis

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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>
This commit is contained in:
Namhyung Kim 2022-07-01 13:54:58 -07:00 committed by Arnaldo Carvalho de Melo
parent 363afa3aef
commit ff898552fb
1 changed files with 3 additions and 2 deletions
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5
tools/perf/util/synthetic-events.c
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@ -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;