linux-kernel - Re: [PATCH 4/6] trace: Replace seq

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Date:	Wed, 05 Nov 2014 14:51:48 -0800
From:	Joe Perches <joe@...ches.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] trace: Replace seq_printf by simpler equivalents

On Wed, 2014-11-05 at 17:34 -0500, Steven Rostedt wrote:
> On Fri, 12 Sep 2014 11:25:52 +0200 Rasmus Villemoes <linux@...musvillemoes.dk> wrote:
> > Using seq_printf to print a simple string or a single character is a
> > lot more expensive than it needs to be, since seq_puts and seq_putc
> > exist.
[]
> > diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
[]
> @@ -556,13 +556,13 @@ static int function_stat_cmp(void *p1, void *p2)
> >  static int function_stat_headers(struct seq_file *m)
> >  {
> >  #ifdef CONFIG_FUNCTION_GRAPH_TRACER
> > -	seq_printf(m, "  Function                               "
> > -		   "Hit    Time            Avg             s^2\n"
> > -		      "  --------                               "
> > -		   "---    ----            ---             ---\n");
> > +	seq_puts(m,
> > +		 "  Function                               " "Hit    Time            Avg             s^2\n"
> > +		 "  --------                               " "---    ----            ---             ---\n");
> 
> Please keep the original format. I know that it's considered bad form
> to split strings like this, but I consider this one of the exceptions
> to the rule.

Why is that?

btw: when the strings fragments are put on the same line,
it's nicer to take out the intermediate joining " " bits too.

I'd've probably used 2 seq_puts calls like:

	seq_puts(m, "  Function                               Hit    Time            Avg             s^2\n");
	seq_puts(m, "  --------                               ---    ----            ---             ---\n");


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