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io_uring: get rid of intermediate aux cqe caches

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io_post_aux_cqe(), which is used for multishot requests, delays
completions by putting CQEs into a temporary array for the purpose
completion lock/flush batching.

DEFER_TASKRUN doesn't need any locking, so for it we can put completions
directly into the CQ and defer post completion handling with a flag.
That leaves !DEFER_TASKRUN, which is not that interesting / hot for
multishot requests, so have conditional locking with deferred flush
for them.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Tested-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/b1d05a81fd27aaa2a07f9860af13059e7ad7a890.1710799188.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2024-03-18 22:00:32 +00:00
committed by Jens Axboe
parent e5c12945be
commit 902ce82c2a
3 changed files with 15 additions and 52 deletions
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2
io_uring/io_uring.h
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@@ -156,7 +156,7 @@ static inline void io_req_task_work_add(struct io_kiocb *req)
static inline void io_submit_flush_completions(struct io_ring_ctx *ctx)
{
if (!wq_list_empty(&ctx->submit_state.compl_reqs) ||
ctx->submit_state.cqes_count)
ctx->submit_state.cq_flush)
__io_submit_flush_completions(ctx);
}