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October 23-26, 2017 - Prague, Czech Republic
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Wednesday, October 25 • 14:15 - 14:55
Replacing the Radix Tree - Matthew Wilcox, Microsoft

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Last year I gave a talk extolling the benefits of the Linux radix tree. This year I am talking about its shortcomings, what I did to improve things, and how I came to the conclusion that it had to be replaced.

The new XArray is easier to use than the radix tree. Conceptually, it is an array of 16 quintillion pointers, all of which are initially NULL. Just like an array, its basic operations are 'load' and 'store', unlike a tree's 'lookup', 'insert' and 'delete'. It provides some more advanced operations, and enables users to build their own operations.

This talk covers general aspects of API design for C programmers, as well as particular considerations for kernel API design due to the constrained environment.


Matthew Wilcox

Kernel hacker, Oracle
Matthew had his first kernel patch accepted in 1998. Since then he has worked on many parts of the Linux kernel including leading the PA-RISC Linux port, maintaining the file locking code, SCSI, USB, NVM Express, and Persistent Memory. He currently works for Microsoft.

Wednesday October 25, 2017 14:15 - 14:55