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

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Message-id: <457954BF.7040707@cosmosbay.com>
Date:	Fri, 08 Dec 2006 13:04:15 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	akpm@...l.org
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

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 ?

# /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

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