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[NET]: move struct proto_ops to const

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I noticed that some of 'struct proto_ops' used in the kernel may share
a cache line used by locks or other heavily modified data. (default
linker alignement is 32 bytes, and L1_CACHE_LINE is 64 or 128 at
least)

This patch makes sure a 'struct proto_ops' can be declared as const,
so that all cpus can share all parts of it without false sharing.

This is not mandatory : a driver can still use a read/write structure
if it needs to (and eventually a __read_mostly)

I made a global stubstitute to change all existing occurences to make
them const.

This should reduce the possibility of false sharing on SMP, and
speedup some socket system calls.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2005-12-22 12:49:22 -08:00
committed by David S. Miller
parent 77d76ea310
commit 90ddc4f047
33 changed files with 66 additions and 66 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/net.h
+2 -2
View File
@@ -107,7 +107,7 @@ enum sock_type {
struct socket {
socket_state state;
unsigned long flags;
struct proto_ops *ops;
const struct proto_ops *ops;
struct fasync_struct *fasync_list;
struct file *file;
struct sock *sk;
@@ -260,7 +260,7 @@ SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct ms
SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
(file, sock, vma)) \
\
static struct proto_ops name##_ops = { \
static const struct proto_ops name##_ops = { \
.family = fam, \
.owner = THIS_MODULE, \
.release = __lock_##name##_release, \
include/net/inet_common.h
+2 -2
View File
@@ -1,8 +1,8 @@
#ifndef _INET_COMMON_H
#define _INET_COMMON_H
extern struct proto_ops inet_stream_ops;
extern struct proto_ops inet_dgram_ops;
extern const struct proto_ops inet_stream_ops;
extern const struct proto_ops inet_dgram_ops;
/*
* INET4 prototypes used by INET6
include/net/ipv6.h
+2 -2
View File
@@ -538,8 +538,8 @@ extern int sysctl_ip6frag_low_thresh;
extern int sysctl_ip6frag_time;
extern int sysctl_ip6frag_secret_interval;
extern struct proto_ops inet6_stream_ops;
extern struct proto_ops inet6_dgram_ops;
extern const struct proto_ops inet6_stream_ops;
extern const struct proto_ops inet6_dgram_ops;
extern int ip6_mc_source(int add, int omode, struct sock *sk,
struct group_source_req *pgsr);
include/net/protocol.h
+1 -1
View File
@@ -65,7 +65,7 @@ struct inet_protosw {
int protocol; /* This is the L4 protocol number. */
struct proto *prot;
struct proto_ops *ops;
const struct proto_ops *ops;
int capability; /* Which (if any) capability do
* we need to use this socket
net/appletalk/ddp.c
+2 -2
View File
@@ -63,7 +63,7 @@
#include <linux/atalk.h>
struct datalink_proto *ddp_dl, *aarp_dl;
static struct proto_ops atalk_dgram_ops;
static const struct proto_ops atalk_dgram_ops;
/**************************************************************************\
* *
@@ -1841,7 +1841,7 @@ static struct net_proto_family atalk_family_ops = {
.owner = THIS_MODULE,
};
static struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
static const struct proto_ops SOCKOPS_WRAPPED(atalk_dgram_ops) = {
.family = PF_APPLETALK,
.owner = THIS_MODULE,
.release = atalk_release,
net/atm/pvc.c
+1 -1
View File
@@ -102,7 +102,7 @@ static int pvc_getname(struct socket *sock,struct sockaddr *sockaddr,
}
static struct proto_ops pvc_proto_ops = {
static const struct proto_ops pvc_proto_ops = {
.family = PF_ATMPVC,
.owner = THIS_MODULE,
net/atm/svc.c
+1 -1
View File
@@ -613,7 +613,7 @@ static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
return error;
}
static struct proto_ops svc_proto_ops = {
static const struct proto_ops svc_proto_ops = {
.family = PF_ATMSVC,
.owner = THIS_MODULE,
net/ax25/af_ax25.c
+2 -2
View File
@@ -54,7 +54,7 @@
HLIST_HEAD(ax25_list);
DEFINE_SPINLOCK(ax25_list_lock);
static struct proto_ops ax25_proto_ops;
static const struct proto_ops ax25_proto_ops;
static void ax25_free_sock(struct sock *sk)
{
@@ -1944,7 +1944,7 @@ static struct net_proto_family ax25_family_ops = {
.owner = THIS_MODULE,
};
static struct proto_ops ax25_proto_ops = {
static const struct proto_ops ax25_proto_ops = {
.family = PF_AX25,
.owner = THIS_MODULE,
.release = ax25_release,
net/bluetooth/bnep/sock.c
+1 -1
View File
@@ -146,7 +146,7 @@ static int bnep_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long
return 0;
}
static struct proto_ops bnep_sock_ops = {
static const struct proto_ops bnep_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = bnep_sock_release,
net/bluetooth/cmtp/sock.c
+1 -1
View File
@@ -137,7 +137,7 @@ static int cmtp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long
return -EINVAL;
}
static struct proto_ops cmtp_sock_ops = {
static const struct proto_ops cmtp_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = cmtp_sock_release,
net/bluetooth/hci_sock.c
+1 -1
View File
@@ -575,7 +575,7 @@ static int hci_sock_getsockopt(struct socket *sock, int level, int optname, char
return 0;
}
static struct proto_ops hci_sock_ops = {
static const struct proto_ops hci_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = hci_sock_release,
net/bluetooth/hidp/sock.c
+1 -1
View File
@@ -143,7 +143,7 @@ static int hidp_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long
return -EINVAL;
}
static struct proto_ops hidp_sock_ops = {
static const struct proto_ops hidp_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = hidp_sock_release,
net/bluetooth/l2cap.c
+2 -2
View File
@@ -57,7 +57,7 @@
#define VERSION "2.8"
static struct proto_ops l2cap_sock_ops;
static const struct proto_ops l2cap_sock_ops;
static struct bt_sock_list l2cap_sk_list = {
.lock = RW_LOCK_UNLOCKED
@@ -2161,7 +2161,7 @@ static ssize_t l2cap_sysfs_show(struct class *dev, char *buf)
static CLASS_ATTR(l2cap, S_IRUGO, l2cap_sysfs_show, NULL);
static struct proto_ops l2cap_sock_ops = {
static const struct proto_ops l2cap_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = l2cap_sock_release,
net/bluetooth/rfcomm/sock.c
+2 -2
View File
@@ -58,7 +58,7 @@
#define BT_DBG(D...)
#endif
static struct proto_ops rfcomm_sock_ops;
static const struct proto_ops rfcomm_sock_ops;
static struct bt_sock_list rfcomm_sk_list = {
.lock = RW_LOCK_UNLOCKED
@@ -907,7 +907,7 @@ static ssize_t rfcomm_sock_sysfs_show(struct class *dev, char *buf)
static CLASS_ATTR(rfcomm, S_IRUGO, rfcomm_sock_sysfs_show, NULL);
static struct proto_ops rfcomm_sock_ops = {
static const struct proto_ops rfcomm_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = rfcomm_sock_release,
net/bluetooth/sco.c
+2 -2
View File
@@ -56,7 +56,7 @@
#define VERSION "0.5"
static struct proto_ops sco_sock_ops;
static const struct proto_ops sco_sock_ops;
static struct bt_sock_list sco_sk_list = {
.lock = RW_LOCK_UNLOCKED
@@ -914,7 +914,7 @@ static ssize_t sco_sysfs_show(struct class *dev, char *buf)
static CLASS_ATTR(sco, S_IRUGO, sco_sysfs_show, NULL);
static struct proto_ops sco_sock_ops = {
static const struct proto_ops sco_sock_ops = {
.family = PF_BLUETOOTH,
.owner = THIS_MODULE,
.release = sco_sock_release,
net/dccp/proto.c
+1 -1
View File
@@ -680,7 +680,7 @@ void dccp_shutdown(struct sock *sk, int how)
EXPORT_SYMBOL_GPL(dccp_shutdown);
static struct proto_ops inet_dccp_ops = {
static const struct proto_ops inet_dccp_ops = {
.family = PF_INET,
.owner = THIS_MODULE,
.release = inet_release,
net/decnet/af_decnet.c
+2 -2
View File
@@ -149,7 +149,7 @@ static void dn_keepalive(struct sock *sk);
#define DN_SK_HASH_MASK (DN_SK_HASH_SIZE - 1)
static struct proto_ops dn_proto_ops;
static const struct proto_ops dn_proto_ops;
static DEFINE_RWLOCK(dn_hash_lock);
static struct hlist_head dn_sk_hash[DN_SK_HASH_SIZE];
static struct hlist_head dn_wild_sk;
@@ -2342,7 +2342,7 @@ static struct net_proto_family dn_family_ops = {
.owner = THIS_MODULE,
};
static struct proto_ops dn_proto_ops = {
static const struct proto_ops dn_proto_ops = {
.family = AF_DECnet,
.owner = THIS_MODULE,
.release = dn_release,
net/econet/af_econet.c
+2 -2
View File
@@ -45,7 +45,7 @@
#include <asm/uaccess.h>
#include <asm/system.h>
static struct proto_ops econet_ops;
static const struct proto_ops econet_ops;
static struct hlist_head econet_sklist;
static DEFINE_RWLOCK(econet_lock);
@@ -698,7 +698,7 @@ static struct net_proto_family econet_family_ops = {
.owner = THIS_MODULE,
};
static struct proto_ops SOCKOPS_WRAPPED(econet_ops) = {
static const struct proto_ops SOCKOPS_WRAPPED(econet_ops) = {
.family = PF_ECONET,
.owner = THIS_MODULE,
.release = econet_release,
net/ipv4/af_inet.c
+3 -3
View File
@@ -785,7 +785,7 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
return err;
}
struct proto_ops inet_stream_ops = {
const struct proto_ops inet_stream_ops = {
.family = PF_INET,
.owner = THIS_MODULE,
.release = inet_release,
@@ -806,7 +806,7 @@ struct proto_ops inet_stream_ops = {
.sendpage = tcp_sendpage
};
struct proto_ops inet_dgram_ops = {
const struct proto_ops inet_dgram_ops = {
.family = PF_INET,
.owner = THIS_MODULE,
.release = inet_release,
@@ -831,7 +831,7 @@ struct proto_ops inet_dgram_ops = {
* For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
* udp_poll
*/
static struct proto_ops inet_sockraw_ops = {
static const struct proto_ops inet_sockraw_ops = {
.family = PF_INET,
.owner = THIS_MODULE,
.release = inet_release,
net/ipv6/af_inet6.c
+3 -3
View File
@@ -462,7 +462,7 @@ int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
return(0);
}
struct proto_ops inet6_stream_ops = {
const struct proto_ops inet6_stream_ops = {
.family = PF_INET6,
.owner = THIS_MODULE,
.release = inet6_release,
@@ -483,7 +483,7 @@ struct proto_ops inet6_stream_ops = {
.sendpage = tcp_sendpage
};
struct proto_ops inet6_dgram_ops = {
const struct proto_ops inet6_dgram_ops = {
.family = PF_INET6,
.owner = THIS_MODULE,
.release = inet6_release,
@@ -511,7 +511,7 @@ static struct net_proto_family inet6_family_ops = {
};
/* Same as inet6_dgram_ops, sans udp_poll. */
static struct proto_ops inet6_sockraw_ops = {
static const struct proto_ops inet6_sockraw_ops = {
.family = PF_INET6,
.owner = THIS_MODULE,
.release = inet6_release,

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