[PATCH 06/19] perf ftrace: add support for trace option sleep-time

[Changbin Du]

This adds an option '--nosleep-time' which allow us only to measure
on-CPU time. This option is function_graph tracer only.

Signed-off-by: Changbin Du <changbin...@gmail.com>
---
 tools/perf/builtin-ftrace.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 8133d910d5d8..d3fcf3b0b792 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -40,6 +40,7 @@ struct perf_ftrace {
        struct list_head        nograph_funcs;
        int                     graph_depth;
        bool                    func_stack_trace;
+       bool                    nosleep_time;
 };
 
 struct filter_entry {
@@ -186,6 +187,7 @@ static void reset_tracing_filters(void);
 static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
 {
        write_tracing_option_file("func_stack_trace", "0");
+       write_tracing_option_file("sleep-time", "1");
 }
 
 static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
@@ -345,6 +347,17 @@ static int set_tracing_depth(struct perf_ftrace *ftrace)
        return 0;
 }
 
+static int set_tracing_sleep_time(struct perf_ftrace *ftrace)
+{
+       if (!ftrace->nosleep_time)
+               return 0;
+
+       if (write_tracing_option_file("sleep-time", "0") < 0)
+               return -1;
+
+       return 0;
+}
+
 static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char 
**argv)
 {
        char *trace_file;
@@ -413,6 +426,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int 
argc, const char **argv)
                goto out_reset;
        }
 
+       if (set_tracing_sleep_time(ftrace) < 0) {
+               pr_err("failed to set tracing option sleep-time\n");
+               goto out_reset;
+       }
+
        if (write_tracing_file("current_tracer", ftrace->tracer) < 0) {
                pr_err("failed to set current_tracer to %s\n", ftrace->tracer);
                goto out_reset;
@@ -548,6 +566,8 @@ int cmd_ftrace(int argc, const char **argv)
                     parse_filter_func),
        OPT_INTEGER('D', "graph-depth", &ftrace.graph_depth,
                    "Max depth for function graph tracer"),
+       OPT_BOOLEAN(0, "nosleep-time", &ftrace.nosleep_time,
+                   "Measure on-CPU time only (function_graph only)"),
        OPT_END()
        };
 
-- 
2.25.1