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**--dma-latency** *us* 26 Set the /dev/cpu_dma_latency to *us*, aiming to bound exit from idle latencies. 27 *cyclictest* sets this value to *0* by default, use **--dma-latency** *0* to have 28 similar results. 29 30**-u**, **--user-threads** 31 32 Set timerlat to run without a workload, and then dispatches user-space workloads 33 to wait on the timerlat_fd. Once the workload is awakes, it goes to sleep again 34 adding so the measurement for the kernel-to-user and user-to-kernel to the tracer 35 output. 36