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    SubjectRe: [PATCH] Remove 8 bytes from struct page on 64bit archs
    On Sun, Jan 06, 2002 at 11:39:14PM +1100, Anton Blanchard wrote:
    > It seems shortening struct page is all the rage at the moment and I
    > didnt want to be left out. On some 64bit architectures (sparc64 and
    > ppc64 for example) all memory is allocated in the DMA zone. Therefore
    > there is no reason to waste 8 bytes per page when every page points to
    > the same zone!

    Very true. I devised something to address this that appears to work on
    multiple architectures already by folding ->zone into ->flags, which
    could be useful. (Dave Jones recommended I just let arch maintainers
    for things other than i386 mess with page_address() for other arches.)
    OTOH, I'm more interested in getting it trimmed down than getting credit.


    Cheers,
    Bill

    P.S.:

    My i386 version, which makes ->virtual conditional on CONFIG_HIGHMEM as
    well, is at:

    ftp://ftp.kernel.org/pub/linux/kernel/people/wli/vm/struct_page/struct_page-2.4.17-rc2
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