1 **-a**, **--auto** *us* 2 3 Set the automatic trace mode. This mode sets some commonly used options 4 while debugging the system. It is equivalent to use **-T** *us* **-s** *us* 5 **-t**. By default, *timerlat* tracer uses FIFO:95 for *timerlat* threads, 6 thus equilavent to **-P** *f:95*. 7 8 **-p**, **--period** *us* 9 10 Set the *timerlat* tracer period in microseconds. 11 12 **-i**, **--irq** *us* 13 14 Stop trace if the *IRQ* latency is higher than the argument in us. 15 16 **-T**, **--thread** *us* 17 18 Stop trace if the *Thread* latency is higher than the argument in us. 19 20 **-s**, **--stack** *us* 21 22 Save the stack trace at the *IRQ* if a *Thread* latency is higher than the 23 argument in us. 24 25 **-t**, **--trace** \[*file*] 26 27 Save the stopped trace to [*file|timerlat_trace.txt*]. 28 29 **--dma-latency** *us* 30 Set the /dev/cpu_dma_latency to *us*, aiming to bound exit from idle latencies. 31 *cyclictest* sets this value to *0* by default, use **--dma-latency** *0* to have 32 similar results. 33 34 **-k**, **--kernel-threads** 35 36 Use timerlat kernel-space threads, in contrast of **-u**. 37 38 **-u**, **--user-threads** 39 40 Set timerlat to run without a workload, and then dispatches user-space workloads 41 to wait on the timerlat_fd. Once the workload is awakes, it goes to sleep again 42 adding so the measurement for the kernel-to-user and user-to-kernel to the tracer 43 output. **--user-threads** will be used unless the user specify **-k**. 44 45 **-U**, **--user-load** 46 47 Set timerlat to run without workload, waiting for the user to dispatch a per-cpu 48 task that waits for a new period on the tracing/osnoise/per_cpu/cpu$ID/timerlat_fd. 49 See linux/tools/rtla/sample/timerlat_load.py for an example of user-load code.
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