slub: Discard slab page when node partial > minimum partial number

Discarding slab should be done when node partial > min_partial.  Otherwise,
node partial slab may eat up all memory.

Signed-off-by: Alex Shi <alex.shi@intel.com>
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

mm/slub.c

@@ -1953,7 +1953,7 @@ static void unfreeze_partials(struct kmem_cache *s)
 
 			new.frozen = 0;
 
-			if (!new.inuse && (!n || n->nr_partial < s->min_partial))
+			if (!new.inuse && (!n || n->nr_partial > s->min_partial))
 				m = M_FREE;
 			else {
 				struct kmem_cache_node *n2 = get_node(s,