linux-kernel - Re: [PATCH 6/6] IA64-sn2_smp: Combine two seq_printf() calls into one call in sn2_ptc_seq

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Date:   Sun, 23 Oct 2016 07:42:05 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:     Joe Perches <joe@...ches.com>, linux-ia64@...r.kernel.org,
        Al Viro <viro@...iv.linux.org.uk>,
        Borislav Petkov <bp@...e.de>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans-Christian Noren Egtvedt <egtvedt@...fundet.no>,
        Ingo Molnar <mingo@...nel.org>,
        Jörg Rödel <jroedel@...e.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Robert Richter <rrichter@...ium.com>,
        Robin Murphy <robin.murphy@....com>,
        Tony Luck <tony.luck@...el.com>,
        Toshi Kani <toshi.kani@....com>,
        Vineet Gupta <vgupta@...opsys.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 6/6] IA64-sn2_smp: Combine two seq_printf() calls into
 one call in sn2_ptc_seq_show()



On Sat, 22 Oct 2016, SF Markus Elfring wrote:

> >> @@ -494,12 +494,11 @@ static int sn2_ptc_seq_show(struct seq_file *file, void *data)
> >>  	int cpu;
> >>
> >>  	cpu = *(loff_t *) data;
> >> -
> >> -	if (!cpu) {
> >> +	if (!cpu)
> >>  		seq_printf(file,
> >> -			   "# cpu ptc_l newrid ptc_flushes nodes_flushed deadlocks lock_nsec shub_nsec shub_nsec_max not_my_mm deadlock2 ipi_fluches ipi_nsec\n");
> >> -		seq_printf(file, "# ptctest %d, flushopt %d\n", sn2_ptctest, sn2_flush_opt);
> >> -	}
> >> +			   "# cpu ptc_l newrid ptc_flushes nodes_flushed deadlocks lock_nsec shub_nsec shub_nsec_max not_my_mm deadlock2 ipi_fluches ipi_nsec\n"
> >> +			   "# ptctest %d, flushopt %d\n",
> >> +			   sn2_ptctest, sn2_flush_opt);
> >>
> >>  	if (cpu < nr_cpu_ids && cpu_online(cpu)) {
> >>  		stat = &per_cpu(ptcstats, cpu);
> >
> > Please think more.
> >
> > printf has to inspect character by character looking for
> > a vsprintf % character and 0 termination.
> >
> > seq_puts does a strlen then memcpy.
>
> Would you prefer to use this function also at this source code place?

I think that he is expecting that you will figure out the answer by
yourself.

julia