linux-kernel - [PATCH 05/43] perf stat: Add identifier flag into struct stat

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Date:   Thu, 30 Aug 2018 08:32:14 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andi Kleen <andi@...stfloor.org>
Subject: [PATCH 05/43] perf stat: Add identifier flag into struct stat_opts

Adding identifier flag into struct stat_opts to carry the
info whether to use PERF_SAMPLE_IDENTIFIER for events.
It makes the create_perf_stat_counter function independent.

Link: http://lkml.kernel.org/n/tip-s1n7gth2e05oxai3gf2z5p3w@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/builtin-stat.c | 22 ++++++++++++----------
 tools/perf/util/stat.h    |  1 +
 2 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 47789558899a..48c88f568fe1 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -261,16 +261,7 @@ static int create_perf_stat_counter(struct perf_evsel *evsel,
 	 */
 	attr->sample_period = 0;
 
-	/*
-	 * But set sample_type to PERF_SAMPLE_IDENTIFIER, which should be harmless
-	 * while avoiding that older tools show confusing messages.
-	 *
-	 * However for pipe sessions we need to keep it zero,
-	 * because script's perf_evsel__check_attr is triggered
-	 * by attr->sample_type != 0, and we can't run it on
-	 * stat sessions.
-	 */
-	if (!(STAT_RECORD && perf_stat.data.is_pipe))
+	if (config->identifier)
 		attr->sample_type = PERF_SAMPLE_IDENTIFIER;
 
 	/*
@@ -3064,6 +3055,17 @@ int cmd_stat(int argc, const char **argv)
 	if (perf_stat_init_aggr_mode())
 		goto out;
 
+	/*
+	 * Set sample_type to PERF_SAMPLE_IDENTIFIER, which should be harmless
+	 * while avoiding that older tools show confusing messages.
+	 *
+	 * However for pipe sessions we need to keep it zero,
+	 * because script's perf_evsel__check_attr is triggered
+	 * by attr->sample_type != 0, and we can't run it on
+	 * stat sessions.
+	 */
+	stat_config.identifier = !(STAT_RECORD && perf_stat.data.is_pipe);
+
 	/*
 	 * We dont want to block the signals - that would cause
 	 * child tasks to inherit that and Ctrl-C would not work.
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index 53b2415ba3f3..918cde064cdc 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -89,6 +89,7 @@ struct perf_stat_config {
 	enum aggr_mode		 aggr_mode;
 	bool			 scale;
 	bool			 no_inherit;
+	bool			 identifier;
 	FILE			*output;
 	unsigned int		 interval;
 	unsigned int		 timeout;
-- 
2.17.1