linux-kernel - Re: [patch 2/2] proc/stat: Make the interrupt statistics more efficient

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Message-ID: <20190130212443.GA15533@avx2>
Date:   Thu, 31 Jan 2019 00:24:43 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Waiman Long <longman@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        linux-fsdevel@...r.kernel.org, Davidlohr Bueso <dave@...olabs.net>,
        Miklos Szeredi <miklos@...redi.hu>,
        Daniel Colascione <dancol@...gle.com>,
        Dave Chinner <david@...morbit.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Marc Zyngier <marc.zyngier@....com>
Subject: Re: [patch 2/2] proc/stat: Make the interrupt statistics more
 efficient

On Wed, Jan 30, 2019 at 01:31:32PM +0100, Thomas Gleixner wrote:
> +static void show_irq_gap(struct seq_file *p, int gap)
> +{
> +	static const char zeros[] = " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0";
> +
> +	while (gap > 0) {
> +		int inc = min_t(int, gap, ARRAY_SIZE(zeros) / 2);
> +
> +		seq_write(p, zeros, 2 * inc);
> +		gap -= inc;
> +	}
> +}
> +
> +static void show_all_irqs(struct seq_file *p)
> +{
> +	int i, next = 0;
> +
> +	for_each_active_irq(i) {
> +		show_irq_gap(p, i - next);
> +		seq_put_decimal_ull(p, " ", kstat_irqs_usr(i));
> +		next = i + 1;
> +	}
> +	show_irq_gap(p, nr_irqs - next);
> +}

Every signed int can and should be unsigned int in this patch.