[PATCHSET 0/4] Use io_wq_work_list for task_work

[Jens Axboe <axboe@kernel.dk>]

Hi,

This converts the deferred, normal, and fallback task_work to use a
normal io_wq_work_list, rather than an llist.

The main motivation behind this is to get rid of the need to reverse
the list once it's deleted and run. I tested this basic conversion of
just switching it from an llist to an io_wq_work_list with a spinlock,
and I don't see any benefits from the lockless list. And for cases where
we get a bursty addition of task_work, this approach is faster as it
avoids the need to iterate the list upfront while reversing it.

And this is less code and simpler, so I'd prefer to go that route.

 include/linux/io_uring_types.h |  13 +--
 io_uring/io_uring.c            | 175 ++++++++++++++++-----------------
 io_uring/io_uring.h            |   8 +-
 io_uring/sqpoll.c              |   8 +-
 io_uring/tctx.c                |   3 +-
 5 files changed, 102 insertions(+), 105 deletions(-)

-- 
Jens Axboe