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

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Message-Id: <20081125213748.2cd86b2b.akpm@linux-foundation.org>
Date:	Tue, 25 Nov 2008 21:37:48 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.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 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.
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