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tcp: tsq: move tsq_flags close to sk_wmem_alloc 

tsq_flags being in the same cache line than sk_wmem_alloc
makes a lot of sense. Both fields are changed from tcp_wfree()
and more generally by various TSQ related functions.

Prior patch made room in struct sock and added sk_tsq_flags,
this patch deletes tsq_flags from struct tcp_sock.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-12-03 11:14:57 -08:00 committed by David S. Miller
parent 9115e8cd2a
commit 7aa5470c2c
6 changed files with 17 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/tcp.h
View File

@ -186,7 +186,6 @@ struct tcp_sock {
u32 tsoffset; /* timestamp offset */
struct list_head tsq_node; /* anchor in tsq_tasklet.head list */
unsigned long tsq_flags;
/* Data for direct copy to user */
struct {

4
net/ipv4/tcp.c
View File

@ -663,9 +663,9 @@ static void tcp_push(struct sock *sk, int flags, int mss_now,
if (tcp_should_autocork(sk, skb, size_goal)) {
/* avoid atomic op if TSQ_THROTTLED bit is already set */
if (!test_bit(TSQ_THROTTLED, &tp->tsq_flags)) {
if (!test_bit(TSQ_THROTTLED, &sk->sk_tsq_flags)) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPAUTOCORKING);
set_bit(TSQ_THROTTLED, &tp->tsq_flags);
set_bit(TSQ_THROTTLED, &sk->sk_tsq_flags);
}
/* It is possible TX completion already happened
* before we set TSQ_THROTTLED.

2
net/ipv4/tcp_ipv4.c
View File

@ -443,7 +443,7 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
if (!sock_owned_by_user(sk)) {
tcp_v4_mtu_reduced(sk);
} else {
if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags))
if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &sk->sk_tsq_flags))
sock_hold(sk);
}
goto out;

24
net/ipv4/tcp_output.c
View File

@ -767,14 +767,15 @@ static void tcp_tasklet_func(unsigned long data)
list_for_each_safe(q, n, &list) {
tp = list_entry(q, struct tcp_sock, tsq_node);
list_del(&tp->tsq_node);
clear_bit(TSQ_QUEUED, &tp->tsq_flags);
sk = (struct sock *)tp;
clear_bit(TSQ_QUEUED, &sk->sk_tsq_flags);
if (!sk->sk_lock.owned &&
test_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags)) {
test_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags)) {
bh_lock_sock(sk);
if (!sock_owned_by_user(sk)) {
clear_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags);
clear_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags);
tcp_tsq_handler(sk);
}
bh_unlock_sock(sk);
@ -797,16 +798,15 @@ static void tcp_tasklet_func(unsigned long data)
*/
void tcp_release_cb(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
unsigned long flags, nflags;
/* perform an atomic operation only if at least one flag is set */
do {
flags = tp->tsq_flags;
flags = sk->sk_tsq_flags;
if (!(flags & TCP_DEFERRED_ALL))
return;
nflags = flags & ~TCP_DEFERRED_ALL;
} while (cmpxchg(&tp->tsq_flags, flags, nflags) != flags);
} while (cmpxchg(&sk->sk_tsq_flags, flags, nflags) != flags);
if (flags & TCPF_TSQ_DEFERRED)
tcp_tsq_handler(sk);
@ -878,7 +878,7 @@ void tcp_wfree(struct sk_buff *skb)
if (wmem >= SKB_TRUESIZE(1) && this_cpu_ksoftirqd() == current)
goto out;
for (oval = READ_ONCE(tp->tsq_flags);; oval = nval) {
for (oval = READ_ONCE(sk->sk_tsq_flags);; oval = nval) {
struct tsq_tasklet *tsq;
bool empty;
@ -886,7 +886,7 @@ void tcp_wfree(struct sk_buff *skb)
goto out;
nval = (oval & ~TSQF_THROTTLED) | TSQF_QUEUED | TCPF_TSQ_DEFERRED;
nval = cmpxchg(&tp->tsq_flags, oval, nval);
nval = cmpxchg(&sk->sk_tsq_flags, oval, nval);
if (nval != oval)
continue;
@ -2100,7 +2100,7 @@ static bool tcp_small_queue_check(struct sock *sk, const struct sk_buff *skb,
skb->prev == sk->sk_write_queue.next)
return false;
set_bit(TSQ_THROTTLED, &tcp_sk(sk)->tsq_flags);
set_bit(TSQ_THROTTLED, &sk->sk_tsq_flags);
/* It is possible TX completion already happened
* before we set TSQ_THROTTLED, so we must
* test again the condition.
@ -2241,8 +2241,8 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
unlikely(tso_fragment(sk, skb, limit, mss_now, gfp)))
break;
if (test_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags))
clear_bit(TCP_TSQ_DEFERRED, &tp->tsq_flags);
if (test_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags))
clear_bit(TCP_TSQ_DEFERRED, &sk->sk_tsq_flags);
if (tcp_small_queue_check(sk, skb, 0))
break;
@ -3545,8 +3545,6 @@ void tcp_send_ack(struct sock *sk)
/* We do not want pure acks influencing TCP Small Queues or fq/pacing
* too much.
* SKB_TRUESIZE(max(1 .. 66, MAX_TCP_HEADER)) is unfortunately ~784
* We also avoid tcp_wfree() overhead (cache line miss accessing
* tp->tsq_flags) by using regular sock_wfree()
*/
skb_set_tcp_pure_ack(buff);

4
net/ipv4/tcp_timer.c
View File

@ -310,7 +310,7 @@ static void tcp_delack_timer(unsigned long data)
inet_csk(sk)->icsk_ack.blocked = 1;
__NET_INC_STATS(sock_net(sk), LINUX_MIB_DELAYEDACKLOCKED);
/* deleguate our work to tcp_release_cb() */
if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED, &tcp_sk(sk)->tsq_flags))
if (!test_and_set_bit(TCP_DELACK_TIMER_DEFERRED, &sk->sk_tsq_flags))
sock_hold(sk);
}
bh_unlock_sock(sk);
@ -592,7 +592,7 @@ static void tcp_write_timer(unsigned long data)
tcp_write_timer_handler(sk);
} else {
/* delegate our work to tcp_release_cb() */
if (!test_and_set_bit(TCP_WRITE_TIMER_DEFERRED, &tcp_sk(sk)->tsq_flags))
if (!test_and_set_bit(TCP_WRITE_TIMER_DEFERRED, &sk->sk_tsq_flags))
sock_hold(sk);
}
bh_unlock_sock(sk);

2
net/ipv6/tcp_ipv6.c
View File

@ -399,7 +399,7 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
if (!sock_owned_by_user(sk))
tcp_v6_mtu_reduced(sk);
else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED,
&tp->tsq_flags))
&sk->sk_tsq_flags))
sock_hold(sk);
goto out;
}