From b0f38338aef2dae5ade3c16acf713737e3b15a73 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Sun, 3 Dec 2017 00:58:47 +0100 Subject: netfilter: reduce size of hook entry point locations struct net contains: struct nf_hook_entries __rcu *hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; which store the hook entry point locations for the various protocol families and the hooks. Using array results in compact c code when doing accesses, i.e. x = rcu_dereference(net->nf.hooks[pf][hook]); but its also wasting a lot of memory, as most families are not used. So split the array into those families that are used, which are only 5 (instead of 13). In most cases, the 'pf' argument is constant, i.e. gcc removes switch statement. struct net before: /* size: 5184, cachelines: 81, members: 46 */ after: /* size: 4672, cachelines: 73, members: 46 */ Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/bridge/br_netfilter_hooks.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/bridge') diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c index c2eea1b8737a..27f1d4f2114a 100644 --- a/net/bridge/br_netfilter_hooks.c +++ b/net/bridge/br_netfilter_hooks.c @@ -991,7 +991,7 @@ int br_nf_hook_thresh(unsigned int hook, struct net *net, unsigned int i; int ret; - e = rcu_dereference(net->nf.hooks[NFPROTO_BRIDGE][hook]); + e = rcu_dereference(net->nf.hooks_bridge[hook]); if (!e) return okfn(net, sk, skb); -- cgit v1.2.3