Re: [RFC][PATCH] iowait statistics

[Rik van Riel <riel@conectiva.com.br>]

On Tue, 14 May 2002, William Lee Irwin III wrote:
> On Mon, May 13, 2002 at 10:19:26PM -0300, Rik van Riel wrote:
> > 2) if no process is running, the timer interrupt adds a jiffy
> >    to the iowait time
> [...]
> > 4) on SMP systems the iowait time can be overestimated, no big
> >    deal IMHO but cheap suggestions for improvement are welcome
                     ^^^^^
> This appears to be global across all cpu's. Maybe nr_iowait_tasks
> should be accounted on a per-cpu basis, where

While your proposal should work, somehow I doubt it's worth
the complexity. It's just a statistic to help sysadmins ;)

regards,

Rik
-- 
	http://www.linuxsymposium.org/2002/
"You're one of those condescending OLS attendants"
"Here's a nickle kid.  Go buy yourself a real t-shirt"

http://www.surriel.com/		http://distro.conectiva.com/

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/