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SUNRPC: Small optimisation of client receive

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Do not queue the client receive work if we're still processing.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2016-05-23 09:24:55 -04:00
parent 5edb56491d
commit 42d42a5b0c
2 changed files with 34 additions and 11 deletions
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1
include/linux/sunrpc/xprtsock.h
View File

@ -80,6 +80,7 @@ struct sock_xprt {
#define TCP_RPC_REPLY (1UL << 6)
#define XPRT_SOCK_CONNECTING 1U
#define XPRT_SOCK_DATA_READY (2)
#endif /* __KERNEL__ */

44
net/sunrpc/xprtsock.c
View File

@ -755,11 +755,19 @@ static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *s
sk->sk_error_report = transport->old_error_report;
}
static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
{
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
}
static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
{
smp_mb__before_atomic();
clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
clear_bit(XPRT_CLOSING, &xprt->state);
xs_sock_reset_state_flags(xprt);
smp_mb__after_atomic();
}
@ -962,10 +970,13 @@ static void xs_local_data_receive(struct sock_xprt *transport)
goto out;
for (;;) {
skb = skb_recv_datagram(sk, 0, 1, &err);
if (skb == NULL)
if (skb != NULL) {
xs_local_data_read_skb(&transport->xprt, sk, skb);
skb_free_datagram(sk, skb);
continue;
}
if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
break;
xs_local_data_read_skb(&transport->xprt, sk, skb);
skb_free_datagram(sk, skb);
}
out:
mutex_unlock(&transport->recv_mutex);
@ -1043,10 +1054,13 @@ static void xs_udp_data_receive(struct sock_xprt *transport)
goto out;
for (;;) {
skb = skb_recv_datagram(sk, 0, 1, &err);
if (skb == NULL)
if (skb != NULL) {
xs_udp_data_read_skb(&transport->xprt, sk, skb);
skb_free_datagram(sk, skb);
continue;
}
if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
break;
xs_udp_data_read_skb(&transport->xprt, sk, skb);
skb_free_datagram(sk, skb);
}
out:
mutex_unlock(&transport->recv_mutex);
@ -1074,7 +1088,8 @@ static void xs_data_ready(struct sock *sk)
if (xprt != NULL) {
struct sock_xprt *transport = container_of(xprt,
struct sock_xprt, xprt);
queue_work(rpciod_workqueue, &transport->recv_worker);
if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
queue_work(rpciod_workqueue, &transport->recv_worker);
}
read_unlock_bh(&sk->sk_callback_lock);
}
@ -1474,10 +1489,15 @@ static void xs_tcp_data_receive(struct sock_xprt *transport)
for (;;) {
lock_sock(sk);
read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
release_sock(sk);
if (read <= 0)
break;
total += read;
if (read <= 0) {
clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
release_sock(sk);
if (!test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
break;
} else {
release_sock(sk);
total += read;
}
rd_desc.count = 65536;
}
out:
@ -1508,6 +1528,8 @@ static void xs_tcp_data_ready(struct sock *sk)
if (!(xprt = xprt_from_sock(sk)))
goto out;
transport = container_of(xprt, struct sock_xprt, xprt);
if (test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
goto out;
/* Any data means we had a useful conversation, so
* the we don't need to delay the next reconnect