| 123456789101112131415161718 |
- The **rtla timerlat** tool is an interface for the *timerlat* tracer. The
- *timerlat* tracer dispatches a kernel thread per-cpu. These threads
- set a periodic timer to wake themselves up and go back to sleep. After
- the wakeup, they collect and generate useful information for the
- debugging of operating system timer latency.
- The *timerlat* tracer outputs information in two ways. It periodically
- prints the timer latency at the timer *IRQ* handler and the *Thread*
- handler. It also enables the trace of the most relevant information via
- **osnoise:** tracepoints.
- The **rtla timerlat** tool sets the options of the *timerlat* tracer
- and collects and displays a summary of the results. By default,
- the collection is done synchronously in kernel space using a dedicated
- BPF program attached to the *timerlat* tracer. If either BPF or
- the **osnoise:timerlat_sample** tracepoint it attaches to is
- unavailable, the **rtla timerlat** tool falls back to using tracefs to
- process the data asynchronously in user space.
|
