io_uring: improve request linking trace
Right now any link trace is listed as being linked after the head request in the chain, but it's more useful to note explicitly which request a given new request is chained to. Change the link trace to dump the tail request so that chains are immediately apparent when looking at traces. Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -2153,7 +2153,7 @@ static inline int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
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* conditions are true (normal request), then just queue it.
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*/
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if (unlikely(link->head)) {
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trace_io_uring_link(req, link->head);
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trace_io_uring_link(req, link->last);
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link->last->link = req;
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link->last = req;
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