[PATCH 23/23] perf ftrace: Make 'function_graph' be the default tracer

Arnaldo Carvalho de Melo
2017-01-25T13:54:44Z

From: Arnaldo Carvalho de Melo <acme@redhat.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@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jeremy Eder <jeder@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-ss9xgx5htpxcv86x42pnh3m6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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