[$] Why printk() is so complicated (and how to fix it)

The kernel's printk()function seems like it should be relatively simple; all it does is format astring and output it to the kernel logs. That simplicity hides a lot ofunderlying complexity, though, and that complexity is why kernel developersare still unhappy with printk() after 28 years. At the 2019 LinuxPlumbers Conference, John Ogness explainedwhere the complexity in printk() comes from and what is being doneto improve the situation.