Analyzing Your System with Tracing Libraries
summary
trace-cmd front end moves functionality into libraries so applications can use trace-cmd features programmatically; libtracefs mounts and reads tracefs, libtracecmd reads/writes trace.dat files, and libtraceeval/libtraceval provide key/value Delta tracking. example tools enable tracing real‑time tasks (priority <100) via tracefs filters, start/stop Delta timers on wake and sched_switch, and produce max/min/count/stddev (example max wakeup ≈1.7ms on a migrate workload). the libraries reproduce trace-cmd output and support efficient offline analysis and custom event formatting.
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chapters (10)
- 0:00System tracing with Trace CMD
- 2:04Trace CMD and kernel tracing
- 5:20Trace FS library for events
- 10:37Trace seek for strings
- 14:48Analyzing raw tracing data
- 18:20Li Tracy Val for latency
- 24:19Wake-up latency tracer
- 33:30Tracing results display
- 37:02Task stats with Li Tracy Val
- 38:25Visualization and Q&A
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