January 2018
Intermediate to advanced
456 pages
12h 49m
English
Content preview from Embedded Linux Development Using Yocto Project Cookbook - Second Edition
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Filtering function traces
You can get finer granularity in the functions being traced by using the dynamic tracer, which can be enabled with the CONFIG_DYNAMIC_FTRACE configuration variable. This is enabled with the tracing functionality by default. This adds two more files, set_ftrace_filter and set_ftrace_notrace. Adding functions to set_ftrace_filter will trace only those functions, and adding them to set_ftrace_notrace will not trace them, even if they are also added to set_ftrace_filter.
The set of available function names that can be filtered may be obtained by executing the following command:
$ cat /sys/kernel/debug/tracing/available_filter_functions
Functions can be added with the following command:
$ echo -n <function_name> >> ...
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