io_uring: shrink final link flush
All good users should not set IOSQE_IO_*LINK flags for the last request of a link. io_uring flushes collected links at the end of submission, but it's not the optimal way and so we don't care too much about it. Replace io_queue_sqe() call with io_queue_sqe_fallback() as the former one is inlined and will generate a bunch of extra code. This will also help compilers with the submission path inlining. > size ./fs/io_uring.o text data bss dec hex filename 87265 13734 8 101007 18a8f ./fs/io_uring.o > size ./fs/io_uring.o text data bss dec hex filename 87073 13734 8 100815 189cf ./fs/io_uring.o Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/01fb5e417ef49925d544a0b0bae30409845ed2b4.1649771823.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -7785,8 +7785,8 @@ static void io_submit_state_end(struct io_ring_ctx *ctx)
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{
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struct io_submit_state *state = &ctx->submit_state;
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if (state->link.head)
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io_queue_sqe(state->link.head);
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if (unlikely(state->link.head))
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io_queue_sqe_fallback(state->link.head);
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/* flush only after queuing links as they can generate completions */
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io_submit_flush_completions(ctx);
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if (state->plug_started)
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