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Tracelevel
Documentation by Alon Farchy
1. Overview
===========
Tracelevel allows subsystem authors to add trace priorities to
their tracing events. High priority traces will be enabled
automatically at boot time.
This module is configured with CONFIG_TRACELEVEL.
2. Usage
=========
To give an event a priority, use the function tracelevel_register
at any time.
tracelevel_register(my_event, level);
my_event corresponds directly to the event name as defined in the
event header file. Available levels are:
TRACELEVEL_ERR 3
TRACELEVEL_WARN 2
TRACELEVEL_INFO 1
TRACELEVEL_DEBUG 0
Any event registered at boot time as TRACELEVEL_ERR will be enabled
by default. The header also exposes the function tracelevel_set_level
to change the trace level at runtime. Any trace event registered with the
specified level or higher will be enabled with this call.
A userspace handle to tracelevel_set_level is available via the module
parameter 'level'. For example,
echo 1 > /sys/module/tracelevel/parameters/level
Is logically equivalent to:
tracelevel_set_level(TRACELEVEL_INFO);
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