[$] A discussion on printk()

The kernel's print function, printk(), has been the target ofnumerous improvement efforts over the years for avariety of reasons. One persistent problem with printk() has beenthat its latency is unacceptably high for the realtime Linux kernel; atthis point, printk() represents the last piece needing changesbefore the RT_PREEMPT patches can be fully merged. So there have been effortsto rework printk() for latency and lots of other reasons, butthose have not made it into the mainline; a recent discussion atthe 2022 Linux Plumbers Conference (LPC)seems to have paved the way for new solution to land in the mainline beforetoo long.