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| author | Eric Dumazet <edumazet@google.com> | 2016-04-01 08:52:12 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-04 22:11:19 -0400 |
| commit | a4298e4522d687a79af8f8fbb7eca68399ab2d81 (patch) | |
| tree | d7a2c3d16b4659a7121b993f4ba690f20adc99fd /net/core/sock.c | |
| parent | 43e2dfb23eb8f3698718ec1e3936c76912de1c30 (diff) | |
| download | op-kernel-dev-a4298e4522d687a79af8f8fbb7eca68399ab2d81.zip op-kernel-dev-a4298e4522d687a79af8f8fbb7eca68399ab2d81.tar.gz | |
net: add SOCK_RCU_FREE socket flag
We want a generic way to insert an RCU grace period before socket
freeing for cases where RCU_SLAB_DESTROY_BY_RCU is adding too
much overhead.
SLAB_DESTROY_BY_RCU strict rules force us to take a reference
on the socket sk_refcnt, and it is a performance problem for UDP
encapsulation, or TCP synflood behavior, as many CPUs might
attempt the atomic operations on a shared sk_refcnt
UDP sockets and TCP listeners can set SOCK_RCU_FREE so that their
lookup can use traditional RCU rules, without refcount changes.
They can set the flag only once hashed and visible by other cpus.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tom Herbert <tom@herbertland.com>
Tested-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/sock.c')
| -rw-r--r-- | net/core/sock.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/net/core/sock.c b/net/core/sock.c index 315f5e5..7a6a063 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1419,8 +1419,12 @@ struct sock *sk_alloc(struct net *net, int family, gfp_t priority, } EXPORT_SYMBOL(sk_alloc); -void sk_destruct(struct sock *sk) +/* Sockets having SOCK_RCU_FREE will call this function after one RCU + * grace period. This is the case for UDP sockets and TCP listeners. + */ +static void __sk_destruct(struct rcu_head *head) { + struct sock *sk = container_of(head, struct sock, sk_rcu); struct sk_filter *filter; if (sk->sk_destruct) @@ -1449,6 +1453,14 @@ void sk_destruct(struct sock *sk) sk_prot_free(sk->sk_prot_creator, sk); } +void sk_destruct(struct sock *sk) +{ + if (sock_flag(sk, SOCK_RCU_FREE)) + call_rcu(&sk->sk_rcu, __sk_destruct); + else + __sk_destruct(&sk->sk_rcu); +} + static void __sk_free(struct sock *sk) { if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt)) |
