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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How to do it...
- You can enable a tracer by echoing its name to the current_tracer file. No tracers are enabled by default:
$ cat /sys/kernel/debug/tracing/current_tracer nop
- You can disable all tracers by executing the following command:
$ echo -n nop > /sys/kernel/debug/tracing/current_tracer
We use echo -n to avoid the trailing newline when echoing to files in sysfs.
- To enable the function tracer, you would execute:
$ echo -n function > /sys/kernel/debug/tracing/current_tracer
- A prettier graph can be obtained by using the function_graph tracer as follows:
$ echo -n function_graph > /sys/kernel/debug/tracing/current_tracer
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