diff --git a/kernel/pid.c b/kernel/pid.c
index f76097c..d88b83e 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -40,6 +40,7 @@
 static struct hlist_head *pid_hash;
 static int pidhash_shift;
 struct pid init_struct_pid = INIT_STRUCT_PID;
+static struct kmem_cache *pid_ns_cachep;
 
 int pid_max = PID_MAX_DEFAULT;
 
@@ -486,7 +487,7 @@
 	struct pid_namespace *ns;
 	int i;
 
-	ns = kmalloc(sizeof(struct pid_namespace), GFP_KERNEL);
+	ns = kmem_cache_alloc(pid_ns_cachep, GFP_KERNEL);
 	if (ns == NULL)
 		goto out;
 
@@ -516,7 +517,7 @@
 out_free_map:
 	kfree(ns->pidmap[0].page);
 out_free:
-	kfree(ns);
+	kmem_cache_free(pid_ns_cachep, ns);
 out:
 	return ERR_PTR(-ENOMEM);
 }
@@ -527,7 +528,7 @@
 
 	for (i = 0; i < PIDMAP_ENTRIES; i++)
 		kfree(ns->pidmap[i].page);
-	kfree(ns);
+	kmem_cache_free(pid_ns_cachep, ns);
 }
 
 struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *old_ns)
@@ -601,4 +602,6 @@
 	init_pid_ns.pid_cachep = create_pid_cachep(1);
 	if (init_pid_ns.pid_cachep == NULL)
 		panic("Can't create pid_1 cachep\n");
+
+	pid_ns_cachep = KMEM_CACHE(pid_namespace, SLAB_PANIC);
 }