linux-kernel - Re: [RFC][PATCH 0/4] tracing: Add event-fork to trace tasks children

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Date:	Tue, 19 Apr 2016 22:30:10 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiri Olsa <jolsa@...nel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	linux-trace-users@...r.kernel.org
Subject: Re: [RFC][PATCH 0/4] tracing: Add event-fork to trace tasks
 children

On Tue, 19 Apr 2016 23:05:28 -0300
Daniel Bristot de Oliveira <bristot@...hat.com> wrote:

> On 04/19/2016 11:34 AM, Steven Rostedt wrote:
> > This code adds the event-fork option that, when set, will have tasks
> > with their PIDs in set_event_pid add their children PIDs when they
> > fork. It will also remove their PID from the file on exit.  
> 
> That is a nice feature! I tested it and it works. But, look this...
> 
> Set the event-fork, the current shell pid, and enable the trace:
> 
> [root@f23 tracing]# echo event-fork > trace_options 
> [root@f23 tracing]# echo $$ > set_ftrace_pid 

event-fork does not affect function tracing. I'm currently working on
patches to create a function-fork option for 4.8.

-- Steve