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    SubjectRe: [rfc 10/10] Pageflags land grab
    On Fri, 29 Feb 2008 20:05:44 -0800
    Christoph Lameter <clameter@sgi.com> wrote:

    > We have enough page flags after vmemmap no longer uses section ids.
    >
    > Reserve 5 of the 6 saved flags for functionality that is currently
    > under development in the VM.
    >
    > The new flags are only available if either of these conditions are met:
    >
    > 1. 64 Bit system. (then we have 8 more free of the 32)
    >
    > 2. !NUMA. In that case 2 bits are needed for the zone
    > id which leaves 30 page flag bits. Of those we use 24. 6 left.
    >
    > 3. !SPARSEMEM. In that case we use 5 bits of the 30 available
    > for the node. 1 leftover.
    >
    > 4. SPARSEMEM_VMEMMAP. Case 3 applies.

    Nice! I like your patch series.

    --
    All rights reversed.


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