Messages in this thread | | | Date | Mon, 02 Apr 2007 15:41:43 -0700 | From | Martin Bligh <> | Subject | Re: [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL |
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Christoph Lameter wrote: > On Tue, 3 Apr 2007, Andi Kleen wrote: > >> If it works I would be inclined to replaced old sparsemem with Christoph's >> new one on x86-64. Perhaps that could cut down the bewildering sparsemem >> ifdef jungle that is there currently. >> >> But I presume it won't work on 32bit because of the limited address space? > > Not in general but it will work in non PAE mode. 4GB need 2^(32-21+4) = > 16MB pages. This would require the mapping on 4 4MB pages.
IIRC NUMA isn't supported (or useful anyway) without PAE.
> For 64GB you'd need 256M which would be a quarter of low mem. Probably > takes up too much of low mem.
Yup.
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