Messages in this thread | | | Date | Fri, 16 Mar 2007 13:48:58 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [PATCH 00/18] Make common x86 arch area for i386 and x86_64 - Take 2 |
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On Fri, 16 Mar 2007, Martin Bligh wrote:
> You have to do some sort of lookup anyway, and Andy seemed to have them > all folded into one.
What lookup would you need to do? On x86_64 even the TLB use is hidden by the existing 2M entries for 1-1 mappings.
> Or are you trying to avoid this by going to back to the crud we had > in 2.4 where we pretend mem_map is one big array, indexed by pfn with > huge sparsely mapped holes in it?
Yes that the advanced way of doing it rather than adding useless custom lookups.
> Would be nice to work out (and document somewhere) what the pros and > cons of virtual memmap vs sparsemem were - ISTR one of the arguments > was extremely sparsely layed out machines, and you needed sparsemem > for that. But right now we have 3 solutions, which is not a good > situation.
Please read my posts to linux-mm on that subject. We discussed it last year in detail and the agreement was that the sparsemem crud needs to be taken out. Kame-san posted patches to do that.
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