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USENIX 2003 Annual Technical Conference, FREENIX Track — Paper
[USENIX Annual Conference '03 Tech Program Index]
Next: Introduction
Using Read-Copy-Update Techniques for System V IPC in the Linux 2.5 KernelAndrea Arcangeli
Abstract:
Read-copy update (RCU) allows lock-free read-only access to data
structures that are concurrently modified on SMP systems.
Despite the concurrent modifications, read-only access requires
neither locks nor atomic instructions, and
can often be written as if the data were unchanging, in
a ``CS 101'' style.
RCU is typically applied to read-mostly linked structures
that the read-side code traverses unidirectionally.
Previous work has shown no clear best RCU implementation for all measures of performance. This paper combines ideas from several RCU implementations in an attempt to create an overall best algorithm, and presents a RCU-based implementation of the System V IPC primitives, improving performance by more than an order of magnitude, while increasing code size by less than 5% (151 lines). This implementation has been accepted into the Linux 2.5 kernel.
Paul McKenney 2003-03-28
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