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| author | Namhyung Kim <namhyung@kernel.org> | 2016-12-06 12:40:03 +0900 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-12-07 12:00:34 -0300 |
| commit | 5d92d96a947a5d0d83710d11750bb29a0c1b985d (patch) | |
| tree | be99b11fff7440a329db06554bb9fd99055caeaa | |
| parent | 571f1eb9b967a52732d2e1f41f1b62e27c900325 (diff) | |
| download | linux-5d92d96a947a5d0d83710d11750bb29a0c1b985d.tar.gz | |
perf sched timehist: Handle zero sample->tid properly
Sometimes samples have tid of 0 but non-0 pid. It ends up having a new thread of 0 tid/pid (instead of referring idle task) since tid is used to search matching task. But I guess it's wrong to use 0 as a tid when pid is set. This patch uses tid only if it has a non-zero value or same as pid (of 0). Signed-off-by: Namhyung Kim <namhyung@kernel.org> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20161206034010.6499-4-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/builtin-sched.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c index 634d8cfb4693..c8b3e6c330c3 100644 --- a/tools/perf/builtin-sched.c +++ b/tools/perf/builtin-sched.c @@ -2118,7 +2118,9 @@ static struct thread *timehist_get_thread(struct perf_sched *sched, pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu); } else { - thread = machine__findnew_thread(machine, sample->pid, sample->tid); + /* there were samples with tid 0 but non-zero pid */ + thread = machine__findnew_thread(machine, sample->pid, + sample->tid ?: sample->pid); if (thread == NULL) { pr_debug("Failed to get thread for tid %d. skipping sample.\n", sample->tid); |