io_uring: batch task_work

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Batching task work up is an important performance optimisation, as
task_work_add is expensive.

In order to keep the semantics replace the task_list with a fake node
while processing the old list, and then do a cmpxchg at the end to see if
there is more work.

Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220622134028.2013417-6-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Dylan Yudaken 2022-06-22 06:40:25 -07:00 • committed by Jens Axboe

parent 923d159247

commit 3a0c037b0e

1 changed files with 13 additions and 9 deletions

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io_uring/io_uring.c

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