本文详细介绍了Linux内核日志的各个级别及其含义，从紧急情况到调试信息，共分为8个等级。这些级别有助于开发者和系统管理员快速定位问题并采取相应措施。
The kernel log levels are:
0 (KERN_EMERG)
The system is unusable.
1 (KERN_ALERT)
Actions that must be taken care of immediately.
2 (KERN_CRIT)
Critical conditions.
3 (KERN_ERR)
Noncritical error conditions.
4 (KERN_WARNING)
Warning conditions that should be taken care of.
5 (KERN_NOTICE)
Normal, but significant events.
6 (KERN_INFO)
Informational messages that require no action.
7 (KERN_DEBUG)
Kernel debugging messages, output by the kernel if the developer enabled debugging at compile time.
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