linux-kernel - Re: [PATCH 4/5] ftrace: add thread comm to function graph tracer

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Date:	Wed, 26 Nov 2008 11:48:44 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	containers@...ts.osdl.org,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 4/5] ftrace: add thread comm to function graph tracer


On Tue, 25 Nov 2008, Andrew Morton wrote:

> On Wed, 26 Nov 2008 00:16:26 -0500 Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > From: Steven Rostedt <rostedt@...dmis.org>
> > 
> > Impact: enhancement to function graph tracer
> > 
> > Export the trace_find_cmdline so the function graph tracer can
> > use it to print the comms of the threads.
> > 
> > -static char *trace_find_cmdline(int pid)
> > +char *trace_find_cmdline(int pid)
> >
> > ...
> >
> >  static int verif_pid(struct trace_seq *s, pid_t pid)
> >  {
> > +	char *comm;
> > +
> >  	if (last_pid != -1 && last_pid == pid)
> >  		return 1;
> >  
> >  	last_pid = pid;
> > -	return trace_seq_printf(s, "\n------------8<---------- thread %d"
> > +	comm = trace_find_cmdline(pid);
> > +
> > +	return trace_seq_printf(s, "\n------------8<---------- thread %s-%d"
> >  				    " ------------8<----------\n\n",
> > -				  pid);
> > +				    comm, pid);
> >  }
> 
> This code gets its int's and pid_t's all mixed up.  It's a bit cosmetic, but
> nice to get it right for readability's sake.

Hmm, I think I would like to keep all pids as ints. Perhaps because we do 
not have namespaces here ;-)

I'm totally confused by what to do. I'll have to think about it.

-- Steve

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