Queued up in a TIP branch ahead of the Linux 6.19 merge window opening in about one month’s time is optimizing the Restartable Sequences “RSEQ” code for its exit to user-space code path.
Intel Fellow Thomas Gleixner of Linutronix worked on a set of patches recently for optimizing the exit to user-space path for Restartable Sequences, the functionality for efficient access and manipulation of per-CPU data structures by user-space.
Those sure are words… Anyone want to translate?
It’s mostly a way to improve coordination around code which uses multiple processor cores, so it will improve multitasking performance for some programs
The last line in the summary in the post should be accessible. It just optimizes managing data in the kernel from user space (i.e. not using privileged kernel access).
Basically performance boost to make it more in line with how libc works now.