June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Preparing to use Ftrace
Ftrace and its various options are configured in the kernel configuration menu. You will need the following as a minimum:
- CONFIG_FUNCTION_TRACER in the menu Kernel hacking | Tracers | Kernel Function Tracer
For reasons that will become clear later, you would be well advised to turn on these options as well:
- CONFIG_FUNCTION_GRAPH_TRACER in the menu Kernel hacking | Tracers | Kernel Function Graph Tracer
- CONFIG_DYNAMIC_FTRACE in the menu Kernel hacking | Tracers | enable/disable function tracing dynamically
Since the whole thing is hosted in the kernel, there is no user space configuration to be done.
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