Messages in this thread | | | Date | Fri, 16 Mar 2007 13:15:38 -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, Andi Kleen wrote:
> > > x86_64 is going to acquire more functionality that will not be available > > for i386. We plan f.e. to add virtual memmap support for x86_64. Virtual > > What advantage would that have over the current setup? > We already should handle holes between nodes reasonably efficiently > and with nonlinear memory even holes inside nodes shouldn't be a problem.
It is primarily a performance improvement since the sparsemem table lookups would no longer be necessary and it also streamlines other frequent cacheline uses. These page -> page_struct and vice versa operations are key to the performance of various subsystem among them the slab allocator.
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