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CONFIG_DYNAMIC_PRINTK_DEBUG: Enable dynamic printk() call support

General informations

The Linux kernel configuration item CONFIG_DYNAMIC_PRINTK_DEBUG:

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Compiles debug level messages into the kernel, which would not otherwise be available at runtime. These messages can then be enabled/disabled on a per module basis. This mechanism implicitly enables all pr_debug() and dev_dbg() calls. The impact of this compile option is a larger kernel text size of about 2%.


Dynamic debugging is controlled by the debugfs file, dynamic_printk/modules. This file contains a list of the modules that can be enabled. The format of the file is the module name, followed by a set of flags that can be enabled. The first flag is always the 'enabled' flag. For example:

<module_name> <enabled=0/1> . . .

<module_name> : Name of the module in which the debug call resides <enabled=0/1> : whether the messages are enabled or not

From a live system:

snd_hda_intel enabled=0 fixup enabled=0 driver enabled=0

Enable a module:

$echo "set enabled=1 <module_name>" > dynamic_printk/modules

Disable a module:

$echo "set enabled=0 <module_name>" > dynamic_printk/modules

Enable all modules:

$echo "set enabled=1 all" > dynamic_printk/modules

Disable all modules:

$echo "set enabled=0 all" > dynamic_printk/modules

Finally, passing "dynamic_printk" at the command line enables debugging for all modules. This mode can be turned off via the above disable command.



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