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linux-sg2042
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inet: remove some sk_listener dependencies 

listener can be source of false sharing. request sock has some
useful information like : ireq->ir_iif, ireq->ir_num, ireq->ireq_net

This patch does not solve the major problem of having to read
sk->sk_protocol which is sharing a cache line with sk->sk_wmem_alloc.
(This same field is read later in ip_build_and_send_pkt())

One idea would be to move sk_protocol close to sk_family
(using 8 bits instead of 16 for sk_family seems enough)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-03-22 10:22:20 -07:00 committed by David S. Miller
parent 42cb80a235
commit 8b929ab12f
1 changed files with 11 additions and 11 deletions
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22
net/ipv4/inet_connection_sock.c
View File

@ -403,18 +403,17 @@ struct dst_entry *inet_csk_route_req(struct sock *sk,
struct flowi4 *fl4,
const struct request_sock *req)
{
struct rtable *rt;
const struct inet_request_sock *ireq = inet_rsk(req);
struct ip_options_rcu *opt = inet_rsk(req)->opt;
struct net *net = sock_net(sk);
int flags = inet_sk_flowi_flags(sk);
struct net *net = read_pnet(&ireq->ireq_net);
struct ip_options_rcu *opt = ireq->opt;
struct rtable *rt;
flowi4_init_output(fl4, sk->sk_bound_dev_if, ireq->ir_mark,
flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark,
RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE,
sk->sk_protocol,
flags,
sk->sk_protocol, inet_sk_flowi_flags(sk),
(opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr,
ireq->ir_loc_addr, ireq->ir_rmt_port, inet_sk(sk)->inet_sport);
ireq->ir_loc_addr, ireq->ir_rmt_port,
htons(ireq->ir_num));
security_req_classify_flow(req, flowi4_to_flowi(fl4));
rt = ip_route_output_flow(net, fl4, sk);
if (IS_ERR(rt))
@ -436,9 +435,9 @@ struct dst_entry *inet_csk_route_child_sock(struct sock *sk,
const struct request_sock *req)
{
const struct inet_request_sock *ireq = inet_rsk(req);
struct net *net = read_pnet(&ireq->ireq_net);
struct inet_sock *newinet = inet_sk(newsk);
struct ip_options_rcu *opt;
struct net *net = sock_net(sk);
struct flowi4 *fl4;
struct rtable *rt;
@ -446,11 +445,12 @@ struct dst_entry *inet_csk_route_child_sock(struct sock *sk,
rcu_read_lock();
opt = rcu_dereference(newinet->inet_opt);
flowi4_init_output(fl4, sk->sk_bound_dev_if, inet_rsk(req)->ir_mark,
flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark,
RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE,
sk->sk_protocol, inet_sk_flowi_flags(sk),
(opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr,
ireq->ir_loc_addr, ireq->ir_rmt_port, inet_sk(sk)->inet_sport);
ireq->ir_loc_addr, ireq->ir_rmt_port,
htons(ireq->ir_num));
security_req_classify_flow(req, flowi4_to_flowi(fl4));
rt = ip_route_output_flow(net, fl4, sk);
if (IS_ERR(rt))