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    SubjectRe: [PATCH] Radix-tree pagecache for 2.5
    On Tue, Jan 29, 2002 at 04:54:44PM +0100, Christoph Hellwig wrote:
    > I've ported my hacked up version of Momchil Velikov's radix tree
    > radix tree pagecache to 2.5.3-pre{5,6}.
    > The changes over the 2.4.17 version are:
    > o use mempool to avoid OOM situation involving radix nodes.
    > o remove add_to_page_cache_locked, it was unused in the 2.4.17 patch.
    > o unify add_to_page and add_to_page_unique
    > It gives nice scalability improvements on big machines and drops the
    > memory usage on small ones (if you consider my 64MB Athlon small :)).

    I love this patch. My only concern is about worst-case space consumption,
    but it is beautiful regardless, and space consumption can be addressed
    later if it is a problem in practice. The average case space consumption,
    as you have noted, is quite good already, and it seems difficult to
    trigger the worst case (I have tested it myself).

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