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SubjectRe: Horrible L2 cache effects from kernel compile
Andi Kleen wrote:
> "John W. M. Stevens" <john@betelgeuse.us> writes:
>
> > http://www.sourcejudy.com/downloads/10minutes.htm
>
> Feel free to code it up. If you did I'm sure someone would be willing
> to test it on large boxes too.
>
> However with RCU in the equation looking may get very interesting...
> Hash tables have the advantage that they're simply enough for lockless
> tricks; balanced trees are likely not so lucky.
>
> -Andi (who took a look at judy some time ago but it looked horribly
> complicated, even worse so than skiplists)

Note that the Judy trees paper has some text deleted which begins
"{some Judy patent applications}... {Remainder deleted, sorry, you
don't need to read this to understand the released software.}".

Maybe some parts of the algorithm are patent-pending in the US?

-- Jamie
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