linux-kernel - Re: [PATCH 16/19] perf ftrace: add option -t/--tid to filter by thread id

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Message-ID: <20200520211228.GE32678@kernel.org>
Date:   Wed, 20 May 2020 18:12:28 -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 16/19] perf ftrace: add option -t/--tid to filter by
 thread id

Em Sun, May 10, 2020 at 11:06:25PM +0800, Changbin Du escreveu:
> This allows us to trace single thread instead of the whole process.

I was going to adjust the patch to add, but you forgot to add the entry
to tools/perf/Documentation/perf-ftrace.txt,

Please do so,

- Arnaldo
 
> Signed-off-by: Changbin Du <changbin.du@...il.com>
> ---
>  tools/perf/builtin-ftrace.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
> index 0b39b6a88026..8d04e5afe2d3 100644
> --- a/tools/perf/builtin-ftrace.c
> +++ b/tools/perf/builtin-ftrace.c
> @@ -707,6 +707,8 @@ int cmd_ftrace(int argc, const char **argv)
>  		    "List available functions to filter"),
>  	OPT_STRING('p', "pid", &ftrace.target.pid, "pid",
>  		   "trace on existing process id"),
> +	OPT_STRING('t', "tid", &ftrace.target.tid, "tid",
> +		   "trace on existing thread id (exclusive to --pid)"),
>  	OPT_INCR('v', "verbose", &verbose,
>  		 "be more verbose"),
>  	OPT_BOOLEAN('a', "all-cpus", &ftrace.target.system_wide,
> -- 
> 2.25.1
> 

-- 

- Arnaldo