linux-kernel - Re: [PATCH 2/3 v2] proc: Export statistics for softirq to /proc

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Date:	Fri, 9 Jan 2009 14:16:42 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	kobayashi.kk@...s.nec.co.jp, kosaki.motohiro@...fujitsu.com,
	linux-kernel@...r.kernel.org, h-shimamoto@...jp.nec.com
Subject: Re: [PATCH 2/3 v2] proc: Export statistics for softirq to /proc

On Wed, 26 Nov 2008 19:10:28 +0900 (JST)
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> nit
> 
> > @@ -49,6 +50,10 @@ static int show_stat(struct seq_file *p, void *v)
> >  			sum += kstat_irqs_cpu(j, i);
> >  
> >  		sum += arch_irq_stat_cpu(i);
> > +
> > +		for (j = 0; j < NR_SOFTIRQS; j++)
> > +			sum_softirq += kstat_softirqs_cpu(j, i);
> > +
> >  	}
> 
> You can calcurate per_irq_sum here.
> Typically, # of possible cpu are very big.
> 
> So, I don't like unnecessary twrice looping.

I was about to send these patches to Linus, but it seems that this
optmisation hasn't been addressed?

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