From: Andrew Morton <akpm@osdl.org>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: linux-kernel@vger.kernel.org, balbir@in.ibm.com,
csturtiv@sgi.com, daw@sgi.com, guillaume.thouvenin@bull.net,
jlan@sgi.com, nagar@watson.ibm.com, tee@sgi.com
Subject: Re: [patch 01/13] io-accounting: core statistics
Date: Fri, 8 Dec 2006 11:47:45 -0800 [thread overview]
Message-ID: <20061208114745.1acd856f.akpm@osdl.org> (raw)
In-Reply-To: <457954BF.7040707@cosmosbay.com>
On Fri, 08 Dec 2006 13:04:15 +0100
Eric Dumazet <dada1@cosmosbay.com> wrote:
> akpm@osdl.org a écrit :
> > From: Andrew Morton <akpm@osdl.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.
prev parent reply other threads:[~2006-12-08 19:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-08 11:52 [patch 01/13] io-accounting: core statistics akpm
2006-12-08 12:04 ` Eric Dumazet
2006-12-08 19:47 ` Andrew Morton [this message]
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