This article explains the inner workings of rtla timerlat’s latency testing, contrasting it with cyclictest, detailing kernel‑mode tracer setup, timer handling, context differentiation, and how the collected trace events are processed by the user‑space rtla application to produce detailed IRQ and thread latency metrics.
This article introduces rtla timerlat, a Linux scheduling‑latency analysis tool that breaks latency into detailed phases, explains how to cross‑compile its libtracefs and libtraceevent dependencies, compile the tool, enable the kernel timerlat tracer, configure common parameters, and run a typical command with sample output.
RTLA (real‑time Linux analysis tool), developed by Red Hat kernel engineer Daniel Bristot de Oliveira, has been merged into the Linux 5.17 source tree, offering kernel‑level tracing of OS noise and timer latency, command‑line options for high‑priority task delay reporting, and trace output for debugging real‑time performance.
