linux-kernel - Re: + getrusage-fill-ru_inblock-and-ru_oublock-fields-if-possible.patch added to -mm tree

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Message-ID: <20070316171023.GA218@tv-sign.ru>
Date:	Fri, 16 Mar 2007 20:10:23 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: + getrusage-fill-ru_inblock-and-ru_oublock-fields-if-possible.patch added to -mm tree

Eric Dumazet wrote:
>
> @@ -2021,6 +2022,8 @@ static void k_getrusage(struct task_stru
>  			r->ru_nivcsw = p->signal->cnivcsw;
>  			r->ru_minflt = p->signal->cmin_flt;
>  			r->ru_majflt = p->signal->cmaj_flt;
> +			r->ru_inblock = task_io_get_inblock(p);
> +			r->ru_oublock = task_io_get_oublock(p);
>
>  			if (who == RUSAGE_CHILDREN)
>  				break;
> @@ -2032,6 +2035,8 @@ static void k_getrusage(struct task_stru
>  			r->ru_nivcsw += p->signal->nivcsw;
>  			r->ru_minflt += p->signal->min_flt;
>  			r->ru_majflt += p->signal->maj_flt;
> +			r->ru_inblock += task_io_get_inblock(p);
> +			r->ru_oublock += task_io_get_oublock(p);
>  			t = p;
>  			do {
>  				utime = cputime_add(utime, t->utime);
> @@ -2040,6 +2045,8 @@ static void k_getrusage(struct task_stru
>  				r->ru_nivcsw += t->nivcsw;
>  				r->ru_minflt += t->min_flt;
>  				r->ru_majflt += t->maj_flt;
> +				r->ru_inblock += task_io_get_inblock(t);
> +				r->ru_oublock += task_io_get_oublock(t);

I can't understand this. Consider k_getrusage(RUSAGE_BOTH). The end result
is that r->ru_inblock == 3 * task_io_get_inblock(p).

No?

Oleg.

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