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    SubjectRe: RFC: CONFIG_PAGE_SHIFT (aka software PAGE_SIZE)
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    On Thu, 2007-07-12 at 18:31 +0200, Andrea Arcangeli wrote:
    > On Fri, Jul 13, 2007 at 12:44:49AM +1000, David Chinner wrote:
    > > That's crap. Just because a machine has lots of memory does not
    > > make it OK to waste lots of memory.
    >
    > It's not just wasted, it lowers overhead all over the place. Yes, the
    > benefit of wasting less pagecache may largely outweight the benefit of
    > having a larger page size, but if you've a lot of memory perhaps your
    > working set already fits in the cache, or perhaps you don't fit in the
    > cache regardless of the page size.

    Have you guys seen Shaggy's page cache tails?

    http://kernel.org/pub/linux/kernel/people/shaggy/OLS-2006/kleikamp.pdf

    We've had the same memory waste issue on ppc64 with 64k hardware
    pages.

    -- Dave

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