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That commit message

kernel test robot noticed a 9.1% improvement of stress-ng.sockfd.ops_per_sec on:

commit: d9f21b3613337b55cc9d4a6ead484dca68475143 ("af_unix: Try to run GC async.")
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d9f21b3613337b55cc9d4a6ead484dca68475143

is very scary to people who remember the "pleasantness" we've already gotten out of this codepath.