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| author | Dylan Yudaken <dylany@fb.com> | 2022-08-30 15:50:12 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-09-21 19:30:42 +0300 |
| commit | 21a091b970cdbcf3e8ff829234b51be6f9192766 (patch) | |
| tree | 5f1b5bb144929d86300b1ed0732c60d645be9c26 /include/linux/btree.h | |
| parent | d8e9214f119db5697382c63a62790a4afb5d00cd (diff) | |
| download | linux-21a091b970cdbcf3e8ff829234b51be6f9192766.tar.xz | |
io_uring: signal registered eventfd to process deferred task work
Some workloads rely on a registered eventfd (via
io_uring_register_eventfd(3)) in order to wake up and process the
io_uring.
In the case of a ring setup with IORING_SETUP_DEFER_TASKRUN, that eventfd
also needs to be signalled when there are tasks to run.
This changes an old behaviour which assumed 1 eventfd signal implied at
least 1 CQE, however only when this new flag is set (and so old users will
not notice). This should be expected with the IORING_SETUP_DEFER_TASKRUN
flag as it is not guaranteed that every task will result in a CQE.
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220830125013.570060-7-dylany@fb.com
[axboe: fold in call_rcu() serialization fix]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/btree.h')
0 files changed, 0 insertions, 0 deletions