Linux Kernel 을 디버깅 하다보면 printk의 레벨이 지정되어 있는 것을 볼 수 있는데,
이를 콘솔로 출력하기 위한 설정 명령은 다음과 같다.
| echo 8 > /proc/sys/kernel/printk |
echo 다음이 해당 등급이며 그 등급에 따른 내용은 아래와 같다.
There are eight possible loglevel strings, defined in the header
<linux/kernel.h>; we list them in order of
decreasing severity:
- KERN_EMERG
-
Used
for emergency messages, usually those that precede a crash.
- KERN_ALERT
-
A
situation requiring immediate action.
- KERN_CRIT
-
Critical
conditions, often related to serious hardware or software failures.
- KERN_ERR
-
Used
to report error conditions; device drivers often use
KERN_ERR to report hardware difficulties.
- KERN_WARNING
-
Warnings
about problematic situations that do not, in themselves, create
serious problems with the system.
- KERN_NOTICE
-
Situations
that are normal, but still worthy of note. A number of
security-related conditions are reported at this level.
- KERN_INFO
-
Informational
messages. Many drivers print information about the hardware they find
at startup time at this level.
- KERN_DEBUG
-
Used
for debugging messages.
Each string (in the macro expansion) represents an integer in angle
brackets. Integers range from 0 to 7, with smaller values
representing higher priorities.
참조 : http://www.makelinux.net/ldd3/chp-4-sect-2
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