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Date: Wed, 30 Jan 2002 12:57:31 +0300
From: Hans Reiser <reiser@namesys.com>
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To: Oliver Xymoron <oxymoron@waste.org>
CC: Chris Mason <mason@suse.com>, Alexander Viro <viro@math.psu.edu>,
        Daniel Phillips <phillips@bonn-fries.net>,
        Linus Torvalds <torvalds@transmeta.com>,
        Josh MacDonald <jmacd@CS.Berkeley.EDU>,
        linux-kernel <linux-kernel@vger.kernel.org>, reiserfs-list@namesys.com,
        reiserfs-dev@namesys.com
Subject: Re: [reiserfs-dev] Re: Note describing poor dcache utilization under high memory pressure
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Oliver Xymoron wrote:

>
>Can we get you to agree that basically all subpage objects are immovable?
>
No.  Certainly not in the general case, and I think Josh found ways to 
handle the dcache case.  If we can simply free the old objects, we don't 
actually have to move the hot ones, as he points out.

>
>And as a consequence that garbage collecting at subpage levels doesn't
>guarantee freeing up any pages that can then be given up to other
>subsystems in response to VM pressure? The GC must think in terms of pages
>to actually make progress.
>
>One of the design goals of slab by the way is that objects of a similar
>type will end up having similar lifetimes, avoiding some of the worst
>cases of sub-page allocations.
>



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