BRT: Change brt_pending_tree sorting order

It does not look important how exactly brt_pending_tree is sorted.
When cloning large file, it is quite likely that all of its blocks
have identical physical birth times, so comparing them first does
not provide useful entropy, while accesses additional cache line.
In most cases combination of vdev and offset provides unique result
and physical birth time comparison is not even needed.  Meanwhile,
when traversing the tree inside brt_pending_apply(), it can be
beneficial for dbuf cache and CPU cache hits to group processing
by vdev and so by the per-VDEV BRT ZAPs.

Reviewed-by: Rob Norris <[email protected]>
Reviewed-by: Brian Atkinson <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by:	Alexander Motin <[email protected]>
Sponsored by:	iXsystems, Inc.
Closes openzfs#15954

module/zfs/brt.c

@@ -1420,13 +1420,14 @@ brt_pending_entry_compare(const void *x1, const void *x2)
 	const blkptr_t *bp1 = &bpe1->bpe_bp, *bp2 = &bpe2->bpe_bp;
 	int cmp;
 
-	cmp = TREE_CMP(BP_PHYSICAL_BIRTH(bp1), BP_PHYSICAL_BIRTH(bp2));
+	cmp = TREE_CMP(DVA_GET_VDEV(&bp1->blk_dva[0]),
+	    DVA_GET_VDEV(&bp2->blk_dva[0]));
 	if (cmp == 0) {
-		cmp = TREE_CMP(DVA_GET_VDEV(&bp1->blk_dva[0]),
-		    DVA_GET_VDEV(&bp2->blk_dva[0]));
-		if (cmp == 0) {
-			cmp = TREE_CMP(DVA_GET_OFFSET(&bp1->blk_dva[0]),
-			    DVA_GET_OFFSET(&bp2->blk_dva[0]));
+		cmp = TREE_CMP(DVA_GET_OFFSET(&bp1->blk_dva[0]),
+		    DVA_GET_OFFSET(&bp2->blk_dva[0]));
+		if (unlikely(cmp == 0)) {
+			cmp = TREE_CMP(BP_PHYSICAL_BIRTH(bp1),
+			    BP_PHYSICAL_BIRTH(bp2));
 		}
 	}