tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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.