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authorArnaldo Carvalho de Melo <acme@redhat.com>2017-01-19 03:49:14 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-01-26 17:43:01 +0300
commitec347870a9d423a4b88657d6a85b5163b3f949ee (patch)
tree72455f4abe80313743cb192bbed0b5fb85a5d3c7 /tools/perf
parentd01f4e8db22cf4d04f6c86351d959b584eb1f5f7 (diff)
downloadlinux-ec347870a9d423a4b88657d6a85b5163b3f949ee.tar.xz
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@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>
Diffstat (limited to 'tools/perf')
-rw-r--r--tools/perf/builtin-ftrace.c3
1 files changed, 2 insertions, 1 deletions
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()