Date: Wed, 03 Mar 2004 11:07:39 -0600
From: Dave McCracken <dmccr@us.ibm.com>
To: Andrea Arcangeli <andrea@suse.de>, "Martin J. Bligh" <mbligh@aracnet.com>
cc: linux-kernel@vger.kernel.org
Subject: Re: 230-objrmap fixes for 2.6.3-mjb2
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--On Wednesday, March 03, 2004 17:57:46 +0100 Andrea Arcangeli
<andrea@suse.de> wrote:

>> There was talk at one point of moving the "unswappable" state down into 
>> the struct page. Is that still realistic? It would seem rather more
>> efficient, but I forget what problem we ran into with it.
> 
> that already exists and it's PG_reserved, but it's inefficient compared
> to VM_RESERVED, since it forces the vm to check all ptes.

What we've actually discussed before was more along the lines of PG_locked
to match VM_LOCKED, but the main idea was to be able to skip over
ineligible pages without having ot look up their mappings during pageout.

Dave McCracken

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