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| author |  Dylan Yudaken <dylany@fb.com>
| 2022-08-30 05:50:12 -0700 |
|---|---|---|
| committer |  Jens Axboe <axboe@kernel.dk>
| 2022-09-21 10:30:42 -0600 |
| commit | 21a091b970cdbcf3e8ff829234b51be6f9192766 (patch) | |
| tree | 5f1b5bb144929d86300b1ed0732c60d645be9c26 /include/linux/io_uring_types.h | |
| parent | io_uring: move io_eventfd_put (diff) | |
| download | linux-21a091b970cdbcf3e8ff829234b51be6f9192766.tar.gz linux-21a091b970cdbcf3e8ff829234b51be6f9192766.tar.bz2 linux-21a091b970cdbcf3e8ff829234b51be6f9192766.zip | |
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/io_uring_types.h')
| -rw-r--r-- | include/linux/io_uring_types.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h index d56ff2185168..aa4d90a53866 100644 --- a/include/linux/io_uring_types.h +++ b/include/linux/io_uring_types.h @@ -184,6 +184,8 @@ struct io_ev_fd { struct eventfd_ctx *cq_ev_fd; unsigned int eventfd_async: 1; struct rcu_head rcu; + atomic_t refs; + atomic_t ops; }; struct io_alloc_cache { |