io_uring: wake up optimisations
commit 3181e22fb79910c7071e84a43af93ac89e8a7106 upstream. Flush completions is done either from the submit syscall or by the task_work, both are in the context of the submitter task, and when it goes for a single threaded rings like implied by ->task_complete, there won't be any waiters on ->cq_wait but the master task. That means that there can be no tasks sleeping on cq_wait while we run __io_submit_flush_completions() and so waking up can be skipped. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/60ad9768ec74435a0ddaa6eec0ffa7729474f69f.1673274244.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -582,6 +582,16 @@ static inline void __io_cq_unlock_post(struct io_ring_ctx *ctx)
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io_cqring_ev_posted(ctx);
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}
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static inline void __io_cq_unlock_post_flush(struct io_ring_ctx *ctx)
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__releases(ctx->completion_lock)
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{
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io_commit_cqring(ctx);
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spin_unlock(&ctx->completion_lock);
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io_commit_cqring_flush(ctx);
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if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN))
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__io_cqring_wake(ctx);
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}
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void io_cq_unlock_post(struct io_ring_ctx *ctx)
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{
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__io_cq_unlock_post(ctx);
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@ -1339,7 +1349,7 @@ static void __io_submit_flush_completions(struct io_ring_ctx *ctx)
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if (!(req->flags & REQ_F_CQE_SKIP))
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__io_fill_cqe_req(ctx, req);
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}
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__io_cq_unlock_post(ctx);
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__io_cq_unlock_post_flush(ctx);
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io_free_batch_list(ctx, state->compl_reqs.first);
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INIT_WQ_LIST(&state->compl_reqs);
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