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Date: Mon, 4 Mar 2002 22:26:30 -0300 (BRT)
From: Rik van Riel <riel@conectiva.com.br>
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To: Andrea Arcangeli <andrea@suse.de>
Cc: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>,
        Daniel Phillips <phillips@bonn-fries.net>,
        Bill Davidsen <davidsen@tmr.com>, Mike Fedyk <mfedyk@matchmail.com>,
        <linux-kernel@vger.kernel.org>
Subject: Re: 2.4.19pre1aa1
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On Tue, 5 Mar 2002, Andrea Arcangeli wrote:
> On Mon, Mar 04, 2002 at 09:01:31PM -0300, Rik van Riel wrote:
> > This could be expressed as:
> >
> > "node A"  HIGHMEM A -> HIGHMEM B -> NORMAL -> DMA
> > "node B"  HIGHMEM B -> HIGHMEM A -> NORMAL -> DMA
>
> Highmem? Let's assume you speak about "normal" and "dma" only of course.
>
> And that's not always the right zonelist layout. If an allocation asks for
> ram from a certain node, like during the ram bindings, we should use the
> current layout of the numa zonelist. If node A is the preferred, than we
> should allocate from node A first,

You're forgetting about the fact that this NUMA box only
has 1 ZONE_NORMAL and 1 ZONE_DMA while it has multiple
HIGHMEM zones...

This makes the fallback pattern somewhat more complex.

regards,

Rik
-- 
"Linux holds advantages over the single-vendor commercial OS"
    -- Microsoft's "Competing with Linux" document

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