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The sbitmap and the percpu_ida perform essentially the same task, allocating tags for commands. The sbitmap outperforms the percpu_ida as documented here: https://lkml.org/lkml/2014/4/22/553 The sbitmap interface is a little harder to use, but being able to remove the percpu_ida code and getting better performance justifies the additional complexity. Signed-off-by: Matthew Wilcox <[email protected]> Acked-by: Felipe Balbi <[email protected]> # f_tcm Reviewed-by: Jens Axboe <[email protected]> Signed-off-by: Martin K. Petersen <[email protected]>