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Date: Fri, 27 Oct 2000 14:31:28 -0200 (BRDT)
From: Rik van Riel <riel@conectiva.com.br>
To: Rui Sousa <rsousa@grad.physics.sunysb.edu>
cc: linux-kernel@vger.kernel.org
Subject: Re: Blocked processes <=> Elevator starvation?
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On Fri, 27 Oct 2000, Rui Sousa wrote:

> I finally had time to give this a better look. It now seems the
> problem is in the VM system.

*sigh*

> schedule()
> ___wait_on_page()
> do_generic_file_read()
> generic_file_read()
> sys_read()
> system_call()
> 
> So it seems the process is either in a loop in ___wait_on_page()
> racing for the PageLock or it never wakes-up... (I guess I could
> add a printk to check which)

It is spinning in ___wait_on_page() because the page never
becomes available, because the IO doesn't get scheduled to
disk in time.

This appears to be an elevator problem, not a VM problem.

regards,

Rik
--
"What you're running that piece of shit Gnome?!?!"
       -- Miguel de Icaza, UKUUG 2000

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

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