tree bca01661645c35ef7958fd5b0a5f9438d9b9b477
parent c34398a8c018e0d3d2d30b718d03c7290c696f51
author Dylan Yudaken <dylany@fb.com> 1655905223 -0700
committer Jens Axboe <axboe@kernel.dk> 1658709555 -0600

io_uring: lockless task list

With networking use cases we see contention on the spinlock used to
protect the task_list when multiple threads try and add completions at once.
Instead we can use a lockless list, and assume that the first caller to
add to the list is responsible for kicking off task work.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220622134028.2013417-4-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>