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Subject[PATCH 14/14] perf ftrace: Add ftrace.tracer config option
Date
From: Taeung Song <treeze.taeung@gmail.com>

Currently 'perf ftrace' command allows selecting 'function_graph' or
'function', defaulting to 'function_graph'.

Add ftrace.tracer config option to select the default 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

Committer notes:

Retesting it with invalid variables, invalid values for ftrace.tracer,
and a valid one:

# cat ~/.perfconfig
[ftrace]
trace = function
# perf ftrace usleep 1
Error: wrong config key-value pair ftrace.trace=function
# cat ~/.perfconfig
[ftrace]
tracer = functin
# perf ftrace usleep 1
Please select "function_graph" (default) or "function"
Error: wrong config key-value pair ftrace.tracer=functin
# cat ~/.perfconfig
[ftrace]
tracer = function
# perf ftrace usleep 1 | head -5
<idle>-0 [000] d... 3855.820847: switch_mm_irqs_off <-__schedule
<...>-18550 [000] d... 3855.820849: finish_task_switch <-__schedule
<...>-18550 [000] d... 3855.820851: smp_irq_work_interrupt <-irq_work_interrupt
<...>-18550 [000] d... 3855.820851: irq_enter <-smp_irq_work_interrupt
<...>-18550 [000] d... 3855.820851: rcu_irq_enter <-irq_enter
#

Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1485862711-20216-3-git-send-email-treeze.taeung@gmail.com
[ Added missign space in error message, changed the logic to make it more compact and less error prone ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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 414444d0e919..c3e643666c72 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 (prefixcmp(var, "ftrace."))
+ return 0;
+
+ if (strcmp(var, "ftrace.tracer"))
+ return -1;
+
+ if (!strcmp(value, "function_graph") ||
+ !strcmp(value, "function")) {
+ ftrace->tracer = value;
+ return 0;
+ }
+
+ pr_err("Please select \"function_graph\" (default) or \"function\"\n");
+ return -1;
+}
+
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)
--
2.9.3
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