Eric Dumazet 4381548237 net: sock_def_readable() and friends RCU conversion ... sk_callback_lock rwlock actually protects sk->sk_sleep pointer, so we need two atomic operations (and associated dirtying) per incoming packet. RCU conversion is pretty much needed : 1) Add a new structure, called "struct socket_wq" to hold all fields that will need rcu_read_lock() protection (currently: a wait_queue_head_t and a struct fasync_struct pointer). [Future patch will add a list anchor for wakeup coalescing] 2) Attach one of such structure to each "struct socket" created in sock_alloc_inode(). 3) Respect RCU grace period when freeing a "struct socket_wq" 4) Change sk_sleep pointer in "struct sock" by sk_wq, pointer to "struct socket_wq" 5) Change sk_sleep() function to use new sk->sk_wq instead of sk->sk_sleep 6) Change sk_has_sleeper() to wq_has_sleeper() that must be used inside a rcu_read_lock() section. 7) Change all sk_has_sleeper() callers to : - Use rcu_read_lock() instead of read_lock(&sk->sk_callback_lock) - Use wq_has_sleeper() to eventually wakeup tasks. - Use rcu_read_unlock() instead of read_unlock(&sk->sk_callback_lock) 8) sock_wake_async() is modified to use rcu protection as well. 9) Exceptions : macvtap, drivers/net/tun.c, af_unix use integrated "struct socket_wq" instead of dynamically allocated ones. They dont need rcu freeing. Some cleanups or followups are probably needed, (possible sk_callback_lock conversion to a spinlock for example...). Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2010-05-01 15:00:15 -07:00
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af_rxrpc.c	net: sock_def_readable() and friends RCU conversion	2010-05-01 15:00:15 -07:00
ar-accept.c
ar-ack.c
ar-call.c
ar-connection.c
ar-connevent.c
ar-error.c
ar-input.c
ar-internal.h
ar-key.c
ar-local.c
ar-output.c
ar-peer.c
ar-proc.c
ar-recvmsg.c	net: use sk_sleep()	2010-04-26 11:18:45 -07:00
ar-security.c
ar-skbuff.c
ar-transport.c
Kconfig
Makefile
rxkad.c