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Subject[PATCH v2 2/4] perf ftrace: Add ftrace.tracer config option
Date
Currently perf ftrace command will select 'function_graph' or 'function'.
So add ftrace.tracer config option to select tracer

# cat ~/.perfconfig
[ftrace]
tracer = function

# perf ftrace usleep 123456 | head -10
<...>-14450 [002] d... 10089.284231: finish_task_switch <-__schedule
<...>-14450 [002] .... 10089.284232: finish_wait <-pipe_wait
<...>-14450 [002] .... 10089.284232: mutex_lock <-pipe_wait
<...>-14450 [002] .... 10089.284232: _cond_resched <-mutex_lock

Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
---
tools/perf/builtin-ftrace.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 414444d..00e228f 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -17,6 +17,7 @@
#include "evlist.h"
#include "target.h"
#include "thread_map.h"
+#include "util/config.h"


#define DEFAULT_TRACER "function_graph"
@@ -198,6 +199,26 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
return done ? 0 : -1;
}

+static int perf_ftrace_config(const char *var, const char *value, void *cb)
+{
+ struct perf_ftrace *ftrace = cb;
+
+ if (!strcmp(var, "ftrace.tracer")) {
+ if (!strcmp(value, "function_graph"))
+ ftrace->tracer = DEFAULT_TRACER;
+ else if (!strcmp(value, "function"))
+ ftrace->tracer = "function";
+ else {
+ pr_err("Please select function_graph(default)"
+ "or function to use tracer.\n");
+ return -1;
+ }
+ return 0;
+ }
+
+ return 0;
+}
+
int cmd_ftrace(int argc, const char **argv, const char *prefix __maybe_unused)
{
int ret;
@@ -218,6 +239,10 @@ int cmd_ftrace(int argc, const char **argv, const char *prefix __maybe_unused)
OPT_END()
};

+ ret = perf_config(perf_ftrace_config, &ftrace);
+ if (ret < 0)
+ return -1;
+
argc = parse_options(argc, argv, ftrace_options, ftrace_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
if (!argc)
--
2.7.4
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