linux-kernel - [PATCH 3/3] perf stat: Use cpu-clock event for cpu targets

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Date:	Fri, 13 May 2016 15:01:03 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: [PATCH 3/3] perf stat: Use cpu-clock event for cpu targets

Currently perf stat always counts task-clock event by default.  But it's
somewhat confusing for system-wide targets (especially with 'sleep N' as
the 'sleep' task just sleeps and doesn't use cputime).  Changing to
cpu-clock event instead for that case makes more sense IMHO.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/builtin-stat.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 5645a8361de6..d602e9e93dc1 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1904,6 +1904,9 @@ static int add_default_attributes(void)
 	}
 
 	if (!evsel_list->nr_entries) {
+		if (target__has_cpu(&target))
+			default_attrs0[0].config = PERF_COUNT_SW_CPU_CLOCK;
+
 		if (perf_evlist__add_default_attrs(evsel_list, default_attrs0) < 0)
 			return -1;
 		if (pmu_have_event("cpu", "stalled-cycles-frontend")) {
-- 
2.8.2