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author | Florian Westphal <fw@strlen.de> | 2017-12-03 02:58:47 +0300 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-01-08 20:01:08 +0300 |
commit | b0f38338aef2dae5ade3c16acf713737e3b15a73 (patch) | |
tree | db01bbe9ba795c8c91933624fb14206ec2c2b2cc /Documentation | |
parent | 8c873e2199700c2de7dbd5eedb9d90d5f109462b (diff) | |
download | linux-b0f38338aef2dae5ade3c16acf713737e3b15a73.tar.xz |
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 'Documentation')
0 files changed, 0 insertions, 0 deletions