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

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Message-Id: <20081126190603.3CC3.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Wed, 26 Nov 2008 19:10:28 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Keika Kobayashi <kobayashi.kk@...s.nec.co.jp>
Cc:	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, h-shimamoto@...jp.nec.com
Subject: Re: [PATCH 2/3 v2] proc: Export statistics for softirq to /proc

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.


>  	sum += arch_irq_stat();
>  
> @@ -111,6 +116,18 @@ static int show_stat(struct seq_file *p, void *v)
>  		nr_running(),
>  		nr_iowait());
>  
> +	seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
> +
> +	for (i = 0; i < NR_SOFTIRQS; i++) {
> +		per_irq_sum = 0;
> +
> +		for_each_possible_cpu(j)
> +			per_irq_sum += kstat_softirqs_cpu(i, j);
> +
> +		seq_printf(p, " %u", per_irq_sum);
> +	}
> +	seq_printf(p, "\n");
> +
>  	return 0;
>  }


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