June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Using Ftrace
The kernel function tracer has tracers to help track down kernel latencies—that is what it was originally written for, after all. These tracers capture the trace for the worst-case latency detected during a run, showing the functions that caused the delay.
The tracers of interest, together with the kernel configuration parameters, are as follows:
- irqsoff: CONFIG_IRQSOFF_TRACER traces code that disables interrupts, recording the worst case
- preemptoff: CONFIG_PREEMPT_TRACER is similar to irqsoff, but traces the longest time that kernel preemption is disabled (only available on preemptible kernels)
- preemptirqsoff: combines the previous two traces to record the largest time either irqs and/or preemption is disabled for
- wakeup: traces ...
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