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Diffstat (limited to 'Documentation/tools/rtla/common_timerlat_options.rst')
| -rw-r--r-- | Documentation/tools/rtla/common_timerlat_options.rst | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/Documentation/tools/rtla/common_timerlat_options.rst b/Documentation/tools/rtla/common_timerlat_options.rst index d3255ed70195..10dc802f8d65 100644 --- a/Documentation/tools/rtla/common_timerlat_options.rst +++ b/Documentation/tools/rtla/common_timerlat_options.rst @@ -22,17 +22,33 @@ Save the stack trace at the *IRQ* if a *Thread* latency is higher than the argument in us. +**-t**, **--trace** \[*file*] + + Save the stopped trace to [*file|timerlat_trace.txt*]. + **--dma-latency** *us* Set the /dev/cpu_dma_latency to *us*, aiming to bound exit from idle latencies. *cyclictest* sets this value to *0* by default, use **--dma-latency** *0* to have similar results. +**--deepest-idle-state** *n* + Disable idle states higher than *n* for cpus that are running timerlat threads to + reduce exit from idle latencies. If *n* is -1, all idle states are disabled. + On exit from timerlat, the idle state setting is restored to its original state + before running timerlat. + + Requires rtla to be built with libcpupower. + +**-k**, **--kernel-threads** + + Use timerlat kernel-space threads, in contrast of **-u**. + **-u**, **--user-threads** Set timerlat to run without a workload, and then dispatches user-space workloads to wait on the timerlat_fd. Once the workload is awakes, it goes to sleep again adding so the measurement for the kernel-to-user and user-to-kernel to the tracer - output. + output. **--user-threads** will be used unless the user specify **-k**. **-U**, **--user-load** |