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

From: Namhyung Kim <namhyung@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Jiri Olsa <jolsa@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
	Andi Kleen <andi@firstfloor.org>
Subject: [PATCH 3/3] perf stat: Use cpu-clock event for cpu targets
Date: Fri, 13 May 2016 15:01:03 +0900	[thread overview]
Message-ID: <1463119263-5569-3-git-send-email-namhyung@kernel.org> (raw)
In-Reply-To: <1463119263-5569-1-git-send-email-namhyung@kernel.org>

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@kernel.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
