linux-kernel - [PATCH 23/23] perf ftrace: Make 'function

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Date:   Wed, 25 Jan 2017 10:53:50 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        David Ahern <dsahern@...il.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Jeremy Eder <jeder@...hat.com>, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Paul Mackerras <paulus@...ba.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Stephane Eranian <eranian@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Wang Nan <wangnan0@...wei.com>
Subject: [PATCH 23/23] perf ftrace: Make 'function_graph' be the default tracer

From: Arnaldo Carvalho de Melo <acme@...hat.com>

So that we can suppress the '-t function_graph' and get a more compact command
line:

  # perf ftrace usleep 123456 | grep raw_spin_lock | sort -k2 -nr | head -5
  2)   0.555 us    |                _raw_spin_lock();
  2)   0.516 us    |          _raw_spin_lock();
  2)   0.410 us    |          _raw_spin_lock_irq();
  2)   0.374 us    |                        _raw_spin_lock_irqsave();
  #

Tested-by: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jeremy Eder <jeder@...hat.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/n/tip-ss9xgx5htpxcv86x42pnh3m6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-ftrace.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index c320ae25c8e6..d05658d2b8f1 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -202,6 +202,7 @@ int cmd_ftrace(int argc, const char **argv, const char *prefix __maybe_unused)
 {
 	int ret;
 	struct perf_ftrace ftrace = {
+		.tracer = "function_graph",
 		.target = { .uid = UINT_MAX, },
 	};
 	const char * const ftrace_usage[] = {
@@ -211,7 +212,7 @@ int cmd_ftrace(int argc, const char **argv, const char *prefix __maybe_unused)
 	};
 	const struct option ftrace_options[] = {
 	OPT_STRING('t', "tracer", &ftrace.tracer, "tracer",
-		   "tracer to use: function_graph or function"),
+		   "tracer to use: function_graph(default) or function"),
 	OPT_INCR('v', "verbose", &verbose,
 		 "be more verbose"),
 	OPT_END()
-- 
2.9.3