| Number | Macro | Log Level | Description | Equivalent |
|---|
| 0 | pr_emerg | Emergency | System is unusable. | KERN_EMERG |
| 1 | pr_alert | Alert | Action must be taken immediately. | KERN_ALERT |
| 2 | pr_crit | Critical | Critical conditions. | KERN_CRIT |
| 3 | pr_err | Error | Error conditions. | KERN_ERR |
| 4 | pr_warn | Warning | Warning conditions. | KERN_WARNING |
| 5 | pr_notice | Notice | Normal but significant condition. | KERN_NOTICE |
| 6 | pr_info | Informational | Informational messages. | KERN_INFO |
| 7 | pr_debug
pr_devel | Debug | Debugging messages. pr_debug() and pr_devel() if DEBUG is defined | KERN_DEBUG |
- The number corresponds to the log level used by the Linux kernel, with lower numbers indicating higher severity.
- For example, if the log level is set to
4 (Warning), only messages from pr_emerg to pr_warn will appear in the system logs. Default log level is generally set to 6. - You can check the current console_loglevel with:
cat /proc/sys/kernel/printk
4 4 1 7
echo 8 > /proc/sys/kernel/printk
dmesg -n 5
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