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90ddc4f047
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>
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
#ifndef _INET_COMMON_H
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#define _INET_COMMON_H
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extern const struct proto_ops inet_stream_ops;
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extern const struct proto_ops inet_dgram_ops;
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/*
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* INET4 prototypes used by INET6
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*/
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struct msghdr;
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struct sock;
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struct sockaddr;
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struct socket;
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extern void inet_remove_sock(struct sock *sk1);
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extern void inet_put_sock(unsigned short num,
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struct sock *sk);
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extern int inet_release(struct socket *sock);
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extern int inet_stream_connect(struct socket *sock,
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struct sockaddr * uaddr,
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int addr_len, int flags);
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extern int inet_dgram_connect(struct socket *sock,
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struct sockaddr * uaddr,
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int addr_len, int flags);
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extern int inet_accept(struct socket *sock,
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struct socket *newsock, int flags);
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extern int inet_sendmsg(struct kiocb *iocb,
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struct socket *sock,
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struct msghdr *msg,
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size_t size);
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extern int inet_shutdown(struct socket *sock, int how);
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extern unsigned int inet_poll(struct file * file, struct socket *sock, struct poll_table_struct *wait);
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extern int inet_listen(struct socket *sock, int backlog);
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extern void inet_sock_destruct(struct sock *sk);
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extern int inet_bind(struct socket *sock,
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struct sockaddr *uaddr, int addr_len);
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extern int inet_getname(struct socket *sock,
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struct sockaddr *uaddr,
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int *uaddr_len, int peer);
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extern int inet_ioctl(struct socket *sock,
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unsigned int cmd, unsigned long arg);
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#endif
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