Man page 9 : mempool_resize

mempool_resize - resize an existing memory pool

int mempool_resize(mempool_t *  pool , int  new_min_nr , gfp_t  gfp_mask );

pool
    pointer to the memory pool which was allocated via mempool_create.

new_min_nr
    the new minimum number of elements guaranteed to be allocated for this pool.

gfp_mask
    the usual allocation bitmask.

This function shrinks/grows the pool. In the case of growing, it cannot be guaranteed that the pool will be grown to the new size immediately, but new mempool_free calls will refill it.

Note, the caller must guarantee that no mempool_destroy is called while this function is running. mempool_alloc & mempool_free might be called (eg. from IRQ contexts) while this function executes.