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    SubjectRe: [PATCH] Radix-tree pagecache for 2.5
    Rik van Riel wrote:
    > On Fri, 1 Feb 2002, Alan Cox wrote:
    > > > the prefetch engine will have to restart every 4kB, so we would want to
    > > > use 16MB pages if possible.
    > > >
    > > > How would we allocate large pages? Would there be a boot option to
    > > > reserve an area of RAM for large pages only?
    > >
    > > If you have an rmap all you have to do is to avoid smearing kernel objects
    > > around lots of 16Mb page sets. If need be you can then get a 16Mb page
    > > back just by shuffling user pages.
    > >
    > > It does make the performance analysis much more interesting though.
    > Actually, I suspect that for most workloads the amount of
    > large pages vs. the amount of small pages should be fairly
    > static.
    > In that case we can just reclaim an old large page from
    > the inactive_clean list whenever we want to allocate a new
    > one.
    > As for not putting kernel objects everywhere, this comes
    > naturally with HIGHMEM ;)

    well except when you start doing pagetables high, as Andrea is doing
    (and it makes tons of sense to do that)
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