diff options
| author | Florian Westphal <fw@strlen.de> | 2017-12-03 00:58:47 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-01-08 18:01:08 +0100 |
| commit | b0f38338aef2dae5ade3c16acf713737e3b15a73 (patch) | |
| tree | db01bbe9ba795c8c91933624fb14206ec2c2b2cc /include/net/netns | |
| parent | netfilter: core: free hooks with call_rcu (diff) | |
| download | linux-b0f38338aef2dae5ade3c16acf713737e3b15a73.tar.xz linux-b0f38338aef2dae5ade3c16acf713737e3b15a73.zip | |
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 <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include/net/netns')
| -rw-r--r-- | include/net/netns/netfilter.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/net/netns/netfilter.h b/include/net/netns/netfilter.h index cc00af2ac2d7..b39c563c2fce 100644 --- a/include/net/netns/netfilter.h +++ b/include/net/netns/netfilter.h @@ -17,7 +17,11 @@ struct netns_nf { #ifdef CONFIG_SYSCTL struct ctl_table_header *nf_log_dir_header; #endif - struct nf_hook_entries __rcu *hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; + struct nf_hook_entries __rcu *hooks_ipv4[NF_MAX_HOOKS]; + struct nf_hook_entries __rcu *hooks_ipv6[NF_MAX_HOOKS]; + struct nf_hook_entries __rcu *hooks_arp[NF_MAX_HOOKS]; + struct nf_hook_entries __rcu *hooks_bridge[NF_MAX_HOOKS]; + struct nf_hook_entries __rcu *hooks_decnet[NF_MAX_HOOKS]; #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV4) bool defrag_ipv4; #endif |