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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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