linux-kernel - Re: [PATCH] perf ftrace: Add -O option to set trace option

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Date:   Tue, 26 Sep 2017 14:03:41 +0800
From:   "Du, Changbin" <changbin.du@...el.com>
To:     changbin.du@...el.com
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf ftrace: Add -O option to set trace option


Ping for review status, thanks.

On Fri, Sep 15, 2017 at 07:19:31PM +0800, changbin.du@...el.com wrote:
> From: Changbin Du <changbin.du@...el.com>
> 
> There are some trace options to control what gets printed in the trace
> output or manipulate the tracers. This patch add a commandline option
> to set it.
> 
> Example:
> perf ftrace -t function -O noprint-parent --trace-funcs "__kmalloc" -a
>             Xorg-1874  [002] ....  4107.182911: __kmalloc
>             Xorg-1874  [002] ....  4107.182920: __kmalloc
> 
> perf ftrace -t function -O print-parent --trace-funcs "__kmalloc" -a
>             Xorg-1874  [000] ....  3924.917243: __kmalloc <-drm_atomic_state_init
>             Xorg-1874  [000] ....  3924.917251: __kmalloc <-drm_atomic_state_init
> 
> Signed-off-by: Changbin Du <changbin.du@...el.com>
> ---
>  tools/perf/builtin-ftrace.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
> index 25a42ac..8b473e2 100644
> --- a/tools/perf/builtin-ftrace.c
> +++ b/tools/perf/builtin-ftrace.c
> @@ -36,6 +36,7 @@ struct perf_ftrace {
>  	struct list_head	graph_funcs;
>  	struct list_head	nograph_funcs;
>  	int			graph_depth;
> +	const char		*trace_option;
>  };
>  
>  struct filter_entry {
> @@ -261,6 +262,17 @@ static int set_tracing_depth(struct perf_ftrace *ftrace)
>  	return 0;
>  }
>  
> +static int set_tracing_option(struct perf_ftrace *ftrace)
> +{
> +	if (ftrace->trace_option == NULL)
> +		return 0;
> +
> +	if (write_tracing_file("trace_options", ftrace->trace_option) < 0)
> +		return -1;
> +
> +	return 0;
> +}
> +
>  static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
>  {
>  	char *trace_file;
> @@ -313,6 +325,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
>  		goto out_reset;
>  	}
>  
> +	if (set_tracing_option(ftrace) < 0) {
> +		pr_err("failed to set trace option\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;
> @@ -456,6 +473,8 @@ 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_STRING('O', "trace-option", &ftrace.trace_option, "option",
> +		   "Set a trace option"),
>  	OPT_END()
>  	};
>  
> -- 
> 2.7.4
> 

-- 
Thanks,
Changbin Du

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