linux-kernel - [PATCH v2] perf sched timehist: Fix use of CPU list with summary option

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Date:   Mon, 17 Aug 2020 11:09:42 -0600
From:   David Ahern <dsahern@...nel.org>
To:     acme@...nel.org
Cc:     namhyung@...nel.org, linux-kernel@...r.kernel.org,
        jolsa@...nel.org, David Ahern <dsahern@...nel.org>
Subject: [PATCH v2] perf sched timehist: Fix use of CPU list with summary option

Do not update thread stats or show idle summary unless CPU is in
the list of interest.

Fixes: c30d630d1bcf ("perf sched timehist: Add support for filtering on CPU")
Signed-off-by: David Ahern <dsahern@...nel.org>
---
v2
- check that cpu_list is set before checking cpu_bitmap in timehist_print_summary
 
 tools/perf/builtin-sched.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 0c7d599fa555..e6fc297cee91 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -2584,7 +2584,8 @@ static int timehist_sched_change_event(struct perf_tool *tool,
 	}
 
 	if (!sched->idle_hist || thread->tid == 0) {
-		timehist_update_runtime_stats(tr, t, tprev);
+		if (!cpu_list || test_bit(sample->cpu, cpu_bitmap))
+			timehist_update_runtime_stats(tr, t, tprev);
 
 		if (sched->idle_hist) {
 			struct idle_thread_runtime *itr = (void *)tr;
@@ -2857,6 +2858,9 @@ static void timehist_print_summary(struct perf_sched *sched,
 
 	printf("\nIdle stats:\n");
 	for (i = 0; i < idle_max_cpu; ++i) {
+		if (cpu_list && !test_bit(i, cpu_bitmap))
+			continue;
+
 		t = idle_threads[i];
 		if (!t)
 			continue;
-- 
2.17.1