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

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Date:   Sat, 6 Jun 2020 22:32:17 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Changbin Du <changbin.du@...il.com>, 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

On Wed, May 20, 2020 at 06:12:28PM -0300, Arnaldo Carvalho de Melo wrote:
> 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,
>
no problem. I will apend a new patch to update all the documentation.

> - 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

-- 
Cheers,
Changbin Du