[Linux] printk顯示關閉時間

時間開啟或關閉

開機後控制:
Enable dmesg timestamp
echo Y > /sys/module/printk/parameters/time

Disable dmesg timestamp
echo N > /sys/module/printk/parameters/time


make menuconfig設定:
CONFIG_PRINTK_TIME=y

loglevel

預設權限

cat /proc/sys/kernel/printk -> 4 4 1 7

4: current log level

4: Default log level

1: min allowed log level

7: boot-timed default log level

把所有訊息印到console

echo 8 > /proc/sys/kernel/printk

printf和printk會印到不同的queue

printf → dmesg
printk → syslog

Message logging with printk