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    SubjectRe: [QUICKLIST 0/4] Arch independent quicklists V2
    Andrew Morton wrote:
    >>On Tue, 13 Mar 2007 00:13:25 -0700 (PDT) Christoph Lameter <clameter@sgi.com> wrote:
    >>Page table pages have the characteristics that they are typically zero
    >>or in a known state when they are freed.
    >
    >
    > Well if they're zero then perhaps they should be released to the page allocator
    > to satisfy the next __GFP_ZERO request. If that request is for a pagetable
    > page, we break even (except we get to remove special-case code). If that
    > __GFP_ZERO allocation was or some application other than for a pagetable, we
    > win.
    >
    > iow, can we just nuke 'em?

    Page allocator still requires interrupts to be disabled, which this doesn't.

    Considering there isn't much else that frees known zeroed pages, I wonder if
    it is worthwhile.

    Last time the zeroidle discussion came up was IIRC not actually real performance
    gain, just cooking the 1024 CPU threaded pagefault numbers ;)

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