June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Combining cyclictest and Ftrace
If cyclictest reports unexpectedly long latencies, you can use the breaktrace option to abort the program and trigger Ftrace to obtain more information.
You invoke breaktrace using -b<N> or --breaktrace=<N>, where N is the number of microseconds of latency that will trigger the trace. You select the Ftrace tracer using -T[tracer name] or one of the following:
- -C: Context switch
- -E: Event
- -f: Function
- -w: Wakeup
- -W: Wakeup-RT
For example, this will trigger the Ftrace function tracer when a latency greater than 100 microseconds is measured:
# cyclictest -a -t -n -p99 -f -b100
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