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

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Message-ID: <20200520210106.GT32678@kernel.org>
Date:   Wed, 20 May 2020 18:01:06 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Changbin Du <changbin.du@...il.com>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/19] perf ftrace: add support for trace option
 sleep-time

Em Sun, May 10, 2020 at 11:06:15PM +0800, Changbin Du escreveu:
> This adds an option '--nosleep-time' which allow us only to measure
> on-CPU time. This option is function_graph tracer only.

This seems, for now, very specific to the function_graph tracer, so
perhaps we should have a:

	--function_graph_opts nosleep-time,other,another,etc

?

In time options that have equivalent in other perf tools can be
promoted?

- Arnaldo
 
> Signed-off-by: Changbin Du <changbin.du@...il.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
> 

-- 

- Arnaldo