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authorNamhyung Kim <namhyung@kernel.org>2016-12-06 06:40:03 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-12-07 18:00:34 +0300
commit5d92d96a947a5d0d83710d11750bb29a0c1b985d (patch)
treebe99b11fff7440a329db06554bb9fd99055caeaa /tools/perf/builtin-sched.c
parent571f1eb9b967a52732d2e1f41f1b62e27c900325 (diff)
downloadlinux-5d92d96a947a5d0d83710d11750bb29a0c1b985d.tar.xz
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>
Diffstat (limited to 'tools/perf/builtin-sched.c')
-rw-r--r--tools/perf/builtin-sched.c4
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);