Subject: Re: can MEXTADD() storage be remapped ?
To: Jason Thorpe <firstname.lastname@example.org>
From: Manuel Bouyer <email@example.com>
Date: 05/24/2005 23:07:18
On Tue, May 24, 2005 at 10:45:13AM -0700, Jason Thorpe wrote:
> >it may still be effectively mapped). Flushing the pmap update queue
> >from the
> >mbuf free routine cause problems (because it can be called from
> >context), and I could just skip this if I was sure that no additionnal
> >mapping ever existed for this buffer.
> Perhaps you could put in a DEBUG-only assertion that the queue is
The queue is shared for all non-urgent pmap updates (e.g. thoses that can wait
until the next context switch). I know it's not empty, because of the panic
I'm seeing. I could try to see if there are updates pending for this
PA, but this would mean making the queue updates interrupt-safe, which I'm
trying to avoid ...
> There should not be any other mappings for buffers that are
> being ext_free'd.
Yes, what I'm trying to know if other mappings have ever existed (in which
case, their removal may still be in the queue).
Manuel Bouyer <firstname.lastname@example.org>
NetBSD: 26 ans d'experience feront toujours la difference