linux-kernel - [PATCH 5.8 052/186] perf sched timehist: Fix use of CPU list with summary option

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Message-Id: <20200908152244.195188556@linuxfoundation.org>
Date:   Tue,  8 Sep 2020 17:23:14 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Ahern <dsahern@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.8 052/186] perf sched timehist: Fix use of CPU list with summary option

From: David Ahern <dsahern@...nel.org>

[ Upstream commit a74eaf1605d42391c2357a70e94e5a2c7780fea9 ]

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

Fixes: c30d630d1bcfad8d ("perf sched timehist: Add support for filtering on CPU")
Signed-off-by: David Ahern <dsahern@...nel.org>
Acked-by: Namhyung Kim <namhyung@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Link: http://lore.kernel.org/lkml/20200817170943.1486-1-dsahern@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 459e4229945e4..7b9511e59b434 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -2575,7 +2575,8 @@ 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;
@@ -2848,6 +2849,9 @@ 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;
-- 
2.25.1