linux-kernel - [tip:perf/core] perf ftrace: Make 'function

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Date:   Thu, 26 Jan 2017 07:33:59 -0800
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     dsahern@...il.com, mingo@...nel.org, hpa@...or.com,
        paulus@...ba.org, namhyung@...nel.org, a.p.zijlstra@...llo.nl,
        adrian.hunter@...el.com, tglx@...utronix.de, rostedt@...dmis.org,
        linux-kernel@...r.kernel.org, eranian@...gle.com, acme@...hat.com,
        wangnan0@...wei.com, mhiramat@...nel.org, jolsa@...nel.org,
        fweisbec@...il.com, jeder@...hat.com
Subject: [tip:perf/core] perf ftrace: Make 'function_graph' be the default
 tracer

Commit-ID:  ec347870a9d423a4b88657d6a85b5163b3f949ee
Gitweb:     http://git.kernel.org/tip/ec347870a9d423a4b88657d6a85b5163b3f949ee
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Wed, 18 Jan 2017 21:49:14 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 26 Jan 2017 11:43:01 -0300

perf ftrace: Make 'function_graph' be the default tracer

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 c320ae2..d05658d 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()