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ALS 2000 Abstract
Lockmeter: Highly-Informative Instrumentation for Spin Locks in the Linux Kernel
Ray Bryant, IBM Linux Technology Center, and John Hawkes SGI, Inc.
Abstract
Lockmeter is a tool for instrumenting the spin locks in a multiprocessor Linux kernel. Lockmeter was designed to make
minimal cache disruptions, taking care to both minimize cache misses and also to minimize interprocessor cache
coherency operations. Lockmeter is "highly informative" in the sense that not only does it record overall statistics for
each spin lock, it also reports (where possible) these statistics on a per caller basis. This allows one to readily identify
which portions of the kernel code are responsible for causing lock contention. In this paper, we describe the capabilities
and implementation of Lockmeter version 1.3.
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