From: David Gibson <david@gibson.dropbear.id.au>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: consistent_alloc() revisited
Date: Sun, 21 Jul 2002 23:23:40 +1000 [thread overview]
Message-ID: <20020721132340.GE22786@zax> (raw)
In-Reply-To: <20020720152213.10662@192.168.4.1>
On Sat, Jul 20, 2002 at 05:22:13PM +0200, Benjamin Herrenschmidt wrote:
>
> >
> >Arguably setting PageReserved is the Right Thing, since
> >consistent_alloc() memory obviously shouldn't be swapped or paged.
> >However, it's only relevant if the memory is mapped into userspace,
> >and then a driver can set VM_IO on the vma to prevent this.
>
> An other issue I had with AGP is, I think, killing the userspace
> process mmap'ing some of this memory will cause the kernel to try
> to free the pages if not PageReserved
Surely it shouldn't if VM_IO is set.
--
David Gibson | For every complex problem there is a
david@gibson.dropbear.id.au | solution which is simple, neat and
| wrong.
http://www.ozlabs.org/people/dgibson
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-07-21 13:23 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-16 2:13 consistent_alloc() revisited David Gibson
2002-07-16 14:09 ` Dan Malek
2002-07-16 14:58 ` Tom Rini
2002-07-16 15:23 ` Matt Porter
2002-07-16 15:27 ` Matt Porter
2002-07-17 1:24 ` David Gibson
2002-07-20 15:28 ` Benjamin Herrenschmidt
2002-07-21 13:26 ` David Gibson
2002-07-20 15:22 ` Benjamin Herrenschmidt
2002-07-21 13:23 ` David Gibson [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-07-16 16:14 Ralph Blach
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