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| author | Jens Axboe <axboe@kernel.dk> | 2021-02-10 03:03:20 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-02-10 17:28:43 +0300 |
| commit | 7cbf1722d5fc5779946ee8f338e9e38b5de15856 (patch) | |
| tree | cafc7b4a2cc122789ca7c1b2045d44ec2a36847a /include/linux/io_uring.h | |
| parent | 1b4c351f6eb7467c77fc19e0cd7e5f0083ecd847 (diff) | |
| download | linux-7cbf1722d5fc5779946ee8f338e9e38b5de15856.tar.xz | |
io_uring: provide FIFO ordering for task_work
task_work is a LIFO list, due to how it's implemented as a lockless
list. For long chains of task_work, this can be problematic as the
first entry added is the last one processed. Similarly, we'd waste
a lot of CPU cycles reversing this list.
Wrap the task_work so we have a single task_work entry per task per
ctx, and use that to run it in the right order.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/io_uring.h')
| -rw-r--r-- | include/linux/io_uring.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h index 35b2d845704d..2eb6d19de336 100644 --- a/include/linux/io_uring.h +++ b/include/linux/io_uring.h @@ -22,6 +22,15 @@ struct io_identity { refcount_t count; }; +struct io_wq_work_node { + struct io_wq_work_node *next; +}; + +struct io_wq_work_list { + struct io_wq_work_node *first; + struct io_wq_work_node *last; +}; + struct io_uring_task { /* submission side */ struct xarray xa; @@ -32,6 +41,11 @@ struct io_uring_task { struct io_identity *identity; atomic_t in_idle; bool sqpoll; + + spinlock_t task_lock; + struct io_wq_work_list task_list; + unsigned long task_state; + struct callback_head task_work; }; #if defined(CONFIG_IO_URING) |