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    SubjectRe: [PATCH 03/10] mm: tag reseve pages
    On Mon, Aug 06, 2007 at 12:10:53PM -0700, Andrew Morton wrote:
    > On Mon, 6 Aug 2007 20:59:26 +0200 Andi Kleen <andi@firstfloor.org> wrote:
    >
    > > > precious page flag
    > >
    > > I always cringe when I hear that. It's really more than node/sparsemem
    > > use too many bits. If we get rid of 32bit NUMA that problem would be
    > > gone for the node at least because it could be moved into the mostly
    > > unused upper 32bit part on 64bit architectures.
    >
    > Removing 32-bit NUMA is attractive - NUMAQ we can probably live without,
    > not sure about summit. But superh is starting to use NUMA now, due to
    > varying access times of various sorts of memory, and one can envisage other
    > embedded setups doing that.
    >
    > Plus I don't think there are many flags left in the upper 32-bits. ia64
    > swooped in and gobbled lots of them, although it's not immediately clear
    > how many were consumed.
    >
    > > The alternative would be to investigate again what it does to the
    > > kernel to just use different lookup methods for this.
    >
    > That's cringeworthy too, I expect.

    Perhaps the node info could be pulled out into a parallel and
    effectively read-only array of shorts.

    --
    Mathematics is the supreme nostalgia of our time.
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