netdev - [PATCH net-next] net: Make account struct net to memcg

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Message-ID: <151990693811.1834.4667591561054337598.stgit@localhost.localdomain>
Date:   Thu, 01 Mar 2018 15:23:28 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     davem@...emloft.net, ktkhai@...tuozzo.com, avagin@...tuozzo.com,
        ebiederm@...ssion.com, fw@...len.de, nicolas.dichtel@...nd.com,
        roman.kapl@...go.com, netdev@...r.kernel.org
Subject: [PATCH net-next] net: Make account struct net to memcg

The patch adds SLAB_ACCOUNT to flags of net_cachep cache,
which enables accounting of struct net memory to memcg kmem.
Since number of net_namespaces may be significant, user
want to know, how much there were consumed, and control.

Note, that we do not account net_generic to the same memcg,
where net was accounted, moreover, we don't do this at all (*).
We do not want the situation, when single memcg memory deficit
prevents us to register new pernet_operations.

(*)Even despite there is !current process accounting already
available in linux-next. See kmalloc_memcg() there for the details.

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
---
 net/core/net_namespace.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 690e78c6af45..c340d5cfbdec 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -882,7 +882,7 @@ static int __init net_ns_init(void)
 #ifdef CONFIG_NET_NS
 	net_cachep = kmem_cache_create("net_namespace", sizeof(struct net),
 					SMP_CACHE_BYTES,
-					SLAB_PANIC, NULL);
+					SLAB_PANIC|SLAB_ACCOUNT, NULL);

 	/* Create workqueue for cleanup */
 	netns_wq = create_singlethread_workqueue("netns");