Define UMA_MD_SMALL_ALLOC so that uma_small_alloc and uma_small_free will

be used for zones that allocate objects of less 1 page.  The biggest advantage
of this is that all of a sudden the majority of kernel malloc-ed data doesn't
need kva allocated for it.  Besides microbenchmarks I haven't seen a measurable
performance improvement from doing this.

sys/sparc64/include/vmparam.h

@@ -177,6 +177,8 @@
 #define	VM_INITIAL_PAGEIN	16
 #endif
 
+#define	UMA_MD_SMALL_ALLOC
+
 extern vm_offset_t vm_max_kernel_address;
 
 #endif /* !_MACHINE_VMPARAM_H_ */