86  * The metaslab weight is used to encode the amount of free space in a
88  * metaslabs by weight. The weight (and therefore the "best" metaslab) can
90  * the free space in the metaslab (a space based weight) or by counting only
91  * the free segments of the largest size (a segment based weight). We prefer
92  * the segment based weight because it reflects how the free space is
96  * the segment weight by looking at each bucket in the histogram and
102  * Space-based weight:
113  * Segment-based weight:
125 #define	WEIGHT_GET_ACTIVE(weight)		BF64_GET((weight), 61, 3)  argument
126 #define	WEIGHT_SET_ACTIVE(weight, x)		BF64_SET((weight), 61, 3, x)  argument
128 #define	WEIGHT_IS_SPACEBASED(weight)		\  argument
129 	((weight) == 0 || BF64_GET((weight), 60, 1))
130 #define	WEIGHT_SET_SPACEBASED(weight)		BF64_SET((weight), 60, 1, 1)  argument
135 #define	WEIGHT_GET_INDEX(weight)		BF64_GET((weight), 54, 6)  argument
136 #define	WEIGHT_SET_INDEX(weight, x)		BF64_SET((weight), 54, 6, x)  argument
137 #define	WEIGHT_GET_COUNT(weight)		BF64_GET((weight), 0, 54)  argument
138 #define	WEIGHT_SET_COUNT(weight, x)		BF64_SET((weight), 0, 54, x)  argument
425 	 * ms_allocatable if it is loaded).  The weight is computed from
429 	 * weight, we need to remove those ranges.
442 	 * When calculating the weight, we can not simply subtract the
467 	uint64_t	ms_weight;	/* weight vs. others in group	*/
468 	uint64_t	ms_activation_weight;	/* activation weight	*/