[PATCH v2 4/6] perf sched timehist: Skip non-idle events when necessary

[Namhyung Kim]

Sometimes it only focuses on idle-related events like upcoming idle-hist
feature.  In this case we don't want to see other event to reduce noise.

Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
 tools/perf/builtin-sched.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 4c5c58ce8958..da3ff3253741 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -2189,7 +2189,9 @@ static struct thread *timehist_get_thread(struct 
perf_sched *sched,
 }
 
 static bool timehist_skip_sample(struct perf_sched *sched,
-                                struct thread *thread)
+                                struct thread *thread,
+                                struct perf_evsel *evsel,
+                                struct perf_sample *sample)
 {
        bool rc = false;
 
@@ -2198,10 +2200,19 @@ static bool timehist_skip_sample(struct perf_sched 
*sched,
                sched->skipped_samples++;
        }
 
+       if (sched->idle_hist) {
+               if (strcmp(perf_evsel__name(evsel), "sched:sched_switch"))
+                       rc = true;
+               else if (perf_evsel__intval(evsel, sample, "prev_pid") != 0 &&
+                        perf_evsel__intval(evsel, sample, "next_pid") != 0)
+                       rc = true;
+       }
+
        return rc;
 }
 
 static void timehist_print_wakeup_event(struct perf_sched *sched,
+                                       struct perf_evsel *evsel,
                                        struct perf_sample *sample,
                                        struct machine *machine,
                                        struct thread *awakened)
@@ -2214,8 +2225,8 @@ static void timehist_print_wakeup_event(struct perf_sched 
*sched,
                return;
 
        /* show wakeup unless both awakee and awaker are filtered */
-       if (timehist_skip_sample(sched, thread) &&
-           timehist_skip_sample(sched, awakened)) {
+       if (timehist_skip_sample(sched, thread, evsel, sample) &&
+           timehist_skip_sample(sched, awakened, evsel, sample)) {
                return;
        }
 
@@ -2260,7 +2271,7 @@ static int timehist_sched_wakeup_event(struct perf_tool 
*tool,
        /* show wakeups if requested */
        if (sched->show_wakeups &&
            !perf_time__skip_sample(&sched->ptime, sample->time))
-               timehist_print_wakeup_event(sched, sample, machine, thread);
+               timehist_print_wakeup_event(sched, evsel, sample, machine, 
thread);
 
        return 0;
 }
@@ -2287,8 +2298,8 @@ static void timehist_print_migration_event(struct 
perf_sched *sched,
        if (thread == NULL)
                return;
 
-       if (timehist_skip_sample(sched, thread) &&
-           timehist_skip_sample(sched, migrated)) {
+       if (timehist_skip_sample(sched, thread, evsel, sample) &&
+           timehist_skip_sample(sched, migrated, evsel, sample)) {
                return;
        }
 
@@ -2373,7 +2384,7 @@ static int timehist_sched_change_event(struct perf_tool 
*tool,
                goto out;
        }
 
-       if (timehist_skip_sample(sched, thread))
+       if (timehist_skip_sample(sched, thread, evsel, sample))
                goto out;
 
        tr = thread__get_runtime(thread);
-- 
2.10.1