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    SubjectRe: [PATCH 00/18] Make common x86 arch area for i386 and x86_64 - Take 2
    From: Christoph Lameter <>
    Date: Fri, 16 Mar 2007 13:15:38 -0700 (PDT)

    > 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.

    If you set the bit range small enough and don't use sparsemem-extreme,
    the cost is extremely low considering the flexibility you obtain.

    There are always going to be holes on large systems, there isn't
    really a way to avoid this given how addressing is done on those
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