perf ftrace: Add support for trace option sleep-time (38988f2e) · Commits · 戴 / test

tools/perf/Documentation/perf-ftrace.txt

+4 −0

Original line number	Diff line number	Diff line
		@@ -101,6 +101,10 @@ OPTIONS
		--graph-depth=::
		Set max depth for function graph tracer to follow

		--graph-opts::
		List of options allowed to set:
		nosleep-time - Measure on-CPU time only for function_graph tracer.

		SEE ALSO
		--------
		linkperf:perf-record[1], linkperf:perf-trace[1]

tools/perf/builtin-ftrace.c

+41 −0

Original line number	Diff line number	Diff line
		@@ -44,6 +44,7 @@ struct perf_ftrace {
		unsigned long percpu_buffer_size;
		bool inherit;
		int func_stack_trace;
		int graph_nosleep_time;
		};

		struct filter_entry {
		@@ -205,6 +206,7 @@ static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
		{
		write_tracing_option_file("function-fork", "0");
		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)
		@@ -386,6 +388,17 @@ static int set_tracing_trace_inherit(struct perf_ftrace *ftrace)
		return 0;
		}

		static int set_tracing_sleep_time(struct perf_ftrace *ftrace)
		{
		if (!ftrace->graph_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;
		@@ -465,6 +478,11 @@ 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;
		@@ -637,6 +655,26 @@ static int parse_func_tracer_opts(const struct option *opt,
		return 0;
		}

		static int parse_graph_tracer_opts(const struct option *opt,
		const char *str, int unset)
		{
		int ret;
		struct perf_ftrace ftrace = (struct perf_ftrace ) opt->value;
		struct sublevel_option graph_tracer_opts[] = {
		{ .name = "nosleep-time", .value_ptr = &ftrace->graph_nosleep_time },
		{ .name = NULL, }
		};

		if (unset)
		return 0;

		ret = perf_parse_sublevel_options(str, graph_tracer_opts);
		if (ret)
		return ret;

		return 0;
		}

		static void select_tracer(struct perf_ftrace *ftrace)
		{
		bool graph = !list_empty(&ftrace->graph_funcs) \|\|
		@@ -694,6 +732,9 @@ int cmd_ftrace(int argc, const char **argv)
		"Set nograph filter on given functions", parse_filter_func),
		OPT_INTEGER('D', "graph-depth", &ftrace.graph_depth,
		"Max depth for function graph tracer"),
		OPT_CALLBACK(0, "graph-opts", &ftrace, "options",
		"graph tracer options, available options: nosleep-time",
		parse_graph_tracer_opts),
		OPT_CALLBACK('m', "buffer-size", &ftrace.percpu_buffer_size, "size",
		"size of per cpu buffer", parse_buffer_size),
		OPT_BOOLEAN(0, "inherit", &ftrace.inherit,

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