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SystemTap uses a command-line interface (CLI) and a scripting language to write instrumentation for a live, running kernel or a user-space application. A SystemTap script associates handlers with named events. When a specified event occurs, the default SystemTap kernel runtime runs the handler in the kernel like a quick subroutine and then resumes. This article lays out the new features in SystemTap 4.5.0. This version will appear in Red Hat Enterprise Linux 9.0. The features fall into three gen...