Messages in this thread | | | Date | Wed, 15 Dec 2004 07:08:46 -0800 | From | "Martin J. Bligh" <> | Subject | Re: [PATCH 0/3] NUMA boot hash allocation interleaving |
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--Andi Kleen <ak@suse.de> wrote (on Wednesday, December 15, 2004 08:17:34 +0100):
> On Tue, Dec 14, 2004 at 11:14:46PM -0800, Martin J. Bligh wrote: >> Well hold on a sec. We don't need to use the hugepages pool for this, >> do we? This is the same as using huge page mappings for the whole of >> kernel space on ia32. As long as it's a kernel mapping, and 16MB aligned >> and contig, we get it for free, surely? > > The whole point of the patch is to not use the direct mapping, but > use a different interleaved mapping on NUMA machines to spread > the memory out over multiple nodes.
Right, I know it's not there pre-existant - I was thinking of frigging it by hand though, rather than using the hugepage pool infrastructure.
>> > Using other page sizes would be probably tricky because the >> > linux VM can currently barely deal with two page sizes. >> > I suspect handling more would need some VM infrastructure effort >> > at least in the changed port. >> >> For the general case I'd agree. But this is a setup-time only tweak >> of the static kernel mapping, isn't it? > > It's probably not impossible, just lots of ugly special cases. > e.g. how about supporting it for /proc/kcore etc?
Hmmm. Yes, not considered those.
M.
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