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Introduce a helper mempool_is_saturated(), which tells if the mempool is under-filled or not. We need it to figure out whether it should be freed right into the mempool or could be cached with top level caches. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/636aed30be8c35d78f45e244998bc6209283cccc.1667384020.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>