diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
index 4176dcec2239..30ca7b917e41 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
@@ -2671,8 +2671,12 @@ arc_reclaim_needed(void)
 	 * Above limits know nothing about real level of KVA fragmentation.
 	 * Start aggressive reclamation if too little sequential KVA left.
 	 */
-	if (vmem_size(heap_arena, VMEM_MAXFREE) < zfs_max_recordsize)
+	if (vmem_size(heap_arena, VMEM_MAXFREE) < zfs_max_recordsize) {
+		DTRACE_PROBE2(arc__reclaim_maxfree, uint64_t,
+		    vmem_size(heap_arena, VMEM_MAXFREE),
+		    uint64_t, zfs_max_recordsize);
 		return (1);
+	}
 
 #else	/* _KERNEL */
 	if (spa_get_random(100) == 0)