I found a URL that you might find useful.

http://sunsite.uakom.sk/sunworldonline/swol-08-1997/swol-08-insidesolaris.ht
ml

Simple and straight forward implementation of a per-cpu iowait statistics
counter.

Balbir

|-----Original Message-----
|From: linux-kernel-owner@vger.kernel.org
|[mailto:linux-kernel-owner@vger.kernel.org]On Behalf Of Rik van Riel
|Sent: Monday, May 13, 2002 2:44 AM
|To: Zlatko Calusic
|Cc: Bill Davidsen; linux-mm@kvack.org; linux-kernel@vger.kernel.org
|Subject: Re: [RFC][PATCH] IO wait accounting
|
|
|On Sun, 12 May 2002, Zlatko Calusic wrote:
|> Rik van Riel <riel@conectiva.com.br> writes:
|> >
|> > And should we measure read() waits as well as page faults or
|> > just page faults ?
|>
|> Definitely both.
|
|OK, I'll look at a way to implement these stats so that
|every IO wait counts as iowait time ... preferably in a
|way that doesn't touch the code in too many places ;)
|
|> Somewhere on the web was a nice document explaining
|> how Solaris measures iowait%, I read it few years ago and it was a
|> great stuff (quite nice explanation).
|>
|> I'll try to find it, as it could be helpful.
|
|Please, it would be useful to get our info compatible with
|theirs so sysadmins can read their statistics the same on
|both systems.
|
|kind regards,
|
|Rik
|--
|Bravely reimplemented by the knights who say "NIH".
|
|http://www.surriel.com/		http://distro.conectiva.com/
|
|-
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