Survey and Analysis of Kernel and Userspace Tracers on Linux: Design, Implementation, and Overhead

摘要

As applications and operating systems are becoming more complex, the last decade has seen the rise of many tracing tools all across the software stack. This article presents a hands-on comparison of modern tracers on Linux systems, both in user space and kernel space. The authors implement microbenchmarks that not only quantify the overhead of different tracers, but also sample fine-grained metrics that unveil insights into the tracers' internals and show the cause of each tracer's overhead. Internal design choices and implementation particularities are discussed, which helps us to understand the challenges of developing tracers. Furthermore, this analysis aims to help users choose and configure their tracers based on their specific requirements to reduce their overhead and get the most of out of them.