linux-kernel - [PATCH 16/20] Create a slab-cache for 'struct pid

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Date:	Fri, 10 Aug 2007 15:48:22 +0400
From:	xemul@...nvz.org
To:	akpm@...l.org
Cc:	xemul@...nvz.org, devel@...nvz.org, linux-kernel@...r.kernel.org,
	containers@...ts.osdl.org, oleg@...sign.ru, sukadev@...ibm.com
Subject: [PATCH 16/20] Create a slab-cache for 'struct pid_namespace'

From: Sukadev Bhattiprolu <sukadev@...ibm.com>

This will help fixing memory leaks due to bad reference counting.

Signed-off-by: Sukadev Bhattiprolu <sukadev@...ibm.com>
Cc: Oleg Nesterov <oleg@...sign.ru>

---

 pid.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

--- ./kernel/pid.c.ve16	2007-08-07 12:50:16.000000000 +0400
+++ ./kernel/pid.c	2007-08-07 12:51:13.000000000 +0400
@@ -34,6 +34,7 @@
 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;
 
@@ -480,7 +481,7 @@ static struct pid_namespace *create_pid_
 	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;
 
@@ -510,7 +511,7 @@ static struct pid_namespace *create_pid_
 out_free_map:
 	kfree(ns->pidmap[0].page);
 out_free:
-	kfree(ns);
+	kmem_cache_free(pid_ns_cachep, ns);
 out:
 	return ERR_PTR(-ENOMEM);
 }
@@ -521,7 +522,7 @@ static void destroy_pid_namespace(struct
 
 	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)
@@ -595,4 +596,6 @@ void __init pidmap_init(void)
 	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);
 }
-
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