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Instead of eagerly running all available local tw, limit the amount of local tw done to the max of IO_LOCAL_TW_DEFAULT_MAX (20) or wait_nr. The value of 20 is chosen as a reasonable heuristic to allow enough work batching but also keep latency down. Add a retry_llist that maintains a list of local tw that couldn't be done in time. No synchronisation is needed since it is only modified within the task context. Signed-off-by: David Wei <dw@davidwei.uk> Link: https://lore.kernel.org/r/20241120221452.3762588-3-dw@davidwei.uk Signed-off-by: Jens Axboe <axboe@kernel.dk>