diff options
| author | Pavel Emelyanov <xemul@openvz.org> | 2008-03-31 19:42:16 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-03-31 19:42:16 -0700 |
| commit | 70ee115942be6ce52ff10e5e813fb4da82cdb25a (patch) | |
| tree | aa3a22dfece765ead70df8f07974e398766b0104 | |
| parent | c29a0bc4dfc4d833eb702b1929cec96a3eeb9f7a (diff) | |
[SOCK][NETNS]: Add the percpu prot_inuse counter in the struct net.
Such an accounting would cost us two more dereferences to get the
percpu variable from the struct net, so I make sock_prot_inuse_get
and _add calls work differently depending on CONFIG_NET_NS - without
it old optimized routines are used.
The per-cpu counter for init_net is prepared in core_initcall, so
that even af_inet, that starts as fs_initcall, will already have the
init_net prepared.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/net/netns/core.h | 3 | ||||
| -rw-r--r-- | net/core/sock.c | 48 |
2 files changed, 51 insertions, 0 deletions
diff --git a/include/net/netns/core.h b/include/net/netns/core.h index 0e8c0f8435d..24d4be76bbd 100644 --- a/include/net/netns/core.h +++ b/include/net/netns/core.h @@ -2,12 +2,15 @@ #define __NETNS_CORE_H__ struct ctl_table_header; +struct prot_inuse; struct netns_core { /* core sysctls */ struct ctl_table_header *sysctl_hdr; int sysctl_somaxconn; + + struct prot_inuse *inuse; }; #endif diff --git a/net/core/sock.c b/net/core/sock.c index 6f36ab91bb5..83e11f7260f 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1947,6 +1947,53 @@ struct prot_inuse { }; static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); + +#ifdef CONFIG_NET_NS +void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) +{ + int cpu = smp_processor_id(); + per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val; +} +EXPORT_SYMBOL_GPL(sock_prot_inuse_add); + +int sock_prot_inuse_get(struct net *net, struct proto *prot) +{ + int cpu, idx = prot->inuse_idx; + int res = 0; + + for_each_possible_cpu(cpu) + res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; + + return res >= 0 ? res : 0; +} +EXPORT_SYMBOL_GPL(sock_prot_inuse_get); + +static int sock_inuse_init_net(struct net *net) +{ + net->core.inuse = alloc_percpu(struct prot_inuse); + return net->core.inuse ? 0 : -ENOMEM; +} + +static void sock_inuse_exit_net(struct net *net) +{ + free_percpu(net->core.inuse); +} + +static struct pernet_operations net_inuse_ops = { + .init = sock_inuse_init_net, + .exit = sock_inuse_exit_net, +}; + +static __init int net_inuse_init(void) +{ + if (register_pernet_subsys(&net_inuse_ops)) + panic("Cannot initialize net inuse counters"); + + return 0; +} + +core_initcall(net_inuse_init); +#else static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) @@ -1966,6 +2013,7 @@ int sock_prot_inuse_get(struct net *net, struct proto *prot) return res >= 0 ? res : 0; } EXPORT_SYMBOL_GPL(sock_prot_inuse_get); +#endif static void assign_proto_idx(struct proto *prot) { |