linux-kernel - Re: [PATCH, take3] getrusage() : Fill ru_inblock and ru

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Message-ID: <20070319143723.GA152@tv-sign.ru>
Date:	Mon, 19 Mar 2007 17:37:23 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH, take3] getrusage() : Fill ru_inblock and ru_oublock fields if possible

On 03/19, Eric Dumazet wrote:
>
> [...snip...]
>  			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);
>  				t = next_thread(t);
>  			} while (t != p);

(offtopic)

We are reading u64 read_bytes/write_bytes which could be updated asynchronously.
/proc/pid/io does the same.

Of course, I don't blame this patch, just a stupid question: can we do something?
I guess not.

Oleg.

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