1*96b546c2SGopi Krishna MenonThe **rtla timerlat** tool is an interface for the *timerlat* tracer. The 2*96b546c2SGopi Krishna Menon*timerlat* tracer dispatches a kernel thread per-cpu. These threads 3*96b546c2SGopi Krishna Menonset a periodic timer to wake themselves up and go back to sleep. After 4*96b546c2SGopi Krishna Menonthe wakeup, they collect and generate useful information for the 5*96b546c2SGopi Krishna Menondebugging of operating system timer latency. 6*96b546c2SGopi Krishna Menon 7*96b546c2SGopi Krishna MenonThe *timerlat* tracer outputs information in two ways. It periodically 8*96b546c2SGopi Krishna Menonprints the timer latency at the timer *IRQ* handler and the *Thread* 9*96b546c2SGopi Krishna Menonhandler. It also enables the trace of the most relevant information via 10*96b546c2SGopi Krishna Menon**osnoise:** tracepoints. 11*96b546c2SGopi Krishna Menon 12*96b546c2SGopi Krishna MenonThe **rtla timerlat** tool sets the options of the *timerlat* tracer 13*96b546c2SGopi Krishna Menonand collects and displays a summary of the results. By default, 14*96b546c2SGopi Krishna Menonthe collection is done synchronously in kernel space using a dedicated 15*96b546c2SGopi Krishna MenonBPF program attached to the *timerlat* tracer. If either BPF or 16*96b546c2SGopi Krishna Menonthe **osnoise:timerlat_sample** tracepoint it attaches to is 17*96b546c2SGopi Krishna Menonunavailable, the **rtla timerlat** tool falls back to using tracefs to 18*96b546c2SGopi Krishna Menonprocess the data asynchronously in user space. 19