Printk debugging summary

1
echo 0 > /proc/sys/kernel/printk
be End printing
2
stay /proc/sys/kernel/printk Will be displayed 4 A numerical （ May by echo modify ）, respectively
Current console log level ;
The default message log level for which the log level is not explicitly specified ;
Minimum （ The highest ） Console log level allowed to be set ;
The default log level at boot time
Linux Kernel debugging printk usage