linux-kernel - Re: [patch 01/13] io-accounting: core statistics

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Message-Id: <20061208114745.1acd856f.akpm@osdl.org>
Date:	Fri, 8 Dec 2006 11:47:45 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	linux-kernel@...r.kernel.org, balbir@...ibm.com, csturtiv@....com,
	daw@....com, guillaume.thouvenin@...l.net, jlan@....com,
	nagar@...son.ibm.com, tee@....com
Subject: Re: [patch 01/13] io-accounting: core statistics

On Fri, 08 Dec 2006 13:04:15 +0100
Eric Dumazet <dada1@...mosbay.com> wrote:

> akpm@...l.org a écrit :
> > From: Andrew Morton <akpm@...l.org>
> > 
> > The present per-task IO accounting isn't very useful.  It simply counts the
> > number of bytes passed into read() and write().  So if a process reads 1MB
> > from an already-cached file, it is accused of having performed 1MB of I/O,
> > which is wrong.
> 
> Any chance we can report some io accounting values in getresource()/wait4()... 
> too ?

That sounds logical.

> # /usr/bin/time find /usr -name 'foo'
> 0.24user 0.22system 0:00.70elapsed 66%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (0major+222minor)pagefaults 0swaps

But where?  ri_inblock and ru_outblock seem to be count-of-operations, not
number-of-bytes.

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