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59c22f70b2
Move -t, --trace from common_options.rst to
common_osnoise_options.rst and
common_timerlat_options.rst
so that it will appear in the man pages
rtla-timerlat-hist.1
rtla-timerlat-top.1
rtla-osnoise-hist.1
rtla-osnoise-top.1
Remove the equals ('=') sign and add a space.
Link: https://lkml.kernel.org/r/20240516143121.12614-1-jkacur@redhat.com
Cc: Daniel Bristot de Oliveria <bristot@kernel.org>
Signed-off-by: John Kacur <jkacur@redhat.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
50 lines
1.8 KiB
ReStructuredText
50 lines
1.8 KiB
ReStructuredText
**-a**, **--auto** *us*
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Set the automatic trace mode. This mode sets some commonly used options
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while debugging the system. It is equivalent to use **-T** *us* **-s** *us*
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**-t**. By default, *timerlat* tracer uses FIFO:95 for *timerlat* threads,
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thus equilavent to **-P** *f:95*.
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**-p**, **--period** *us*
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Set the *timerlat* tracer period in microseconds.
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**-i**, **--irq** *us*
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Stop trace if the *IRQ* latency is higher than the argument in us.
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**-T**, **--thread** *us*
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Stop trace if the *Thread* latency is higher than the argument in us.
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**-s**, **--stack** *us*
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Save the stack trace at the *IRQ* if a *Thread* latency is higher than the
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argument in us.
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**-t**, **--trace** \[*file*]
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Save the stopped trace to [*file|timerlat_trace.txt*].
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**--dma-latency** *us*
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Set the /dev/cpu_dma_latency to *us*, aiming to bound exit from idle latencies.
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*cyclictest* sets this value to *0* by default, use **--dma-latency** *0* to have
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similar results.
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**-k**, **--kernel-threads**
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Use timerlat kernel-space threads, in contrast of **-u**.
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**-u**, **--user-threads**
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Set timerlat to run without a workload, and then dispatches user-space workloads
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to wait on the timerlat_fd. Once the workload is awakes, it goes to sleep again
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adding so the measurement for the kernel-to-user and user-to-kernel to the tracer
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output. **--user-threads** will be used unless the user specify **-k**.
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**-U**, **--user-load**
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Set timerlat to run without workload, waiting for the user to dispatch a per-cpu
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task that waits for a new period on the tracing/osnoise/per_cpu/cpu$ID/timerlat_fd.
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See linux/tools/rtla/sample/timerlat_load.py for an example of user-load code.
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