Messages in this thread | | | Date | Mon, 6 Jul 2020 09:08:15 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline |
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> > What's the point of this indirection other than another way of avoiding > > empty node 0? > > Honestly, I do not have any idea. I've traced it down to > Author: Andi Kleen <ak@suse.de> > Date: Tue Jan 11 15:35:48 2005 -0800
I don't remember all the details, and I can't even find the commit (is it in linux-historic?).
But AFAIK there's no guarantee PXMs are small and continuous, so it seemed better to have a clean zero based space.
Back then we had a lot of problems with buggy SRAT tables in BIOS, so we really tried to avoid trusting the BIOS as much as possible.
-Andi
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