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SUNRPC: Add explicit rescheduling points in the receive path

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When reading the reply from the server, insert an explicit
cond_resched() to avoid starving higher priority tasks.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2018-01-14 15:28:29 -05:00
parent 3d188805f8
commit 0af3442af7
1 changed files with 19 additions and 2 deletions
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21
net/sunrpc/xprtsock.c
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@ -1005,6 +1005,7 @@ static void xs_local_data_receive(struct sock_xprt *transport)
struct sock *sk;
int err;
restart:
mutex_lock(&transport->recv_mutex);
sk = transport->inet;
if (sk == NULL)
@ -1018,6 +1019,11 @@ static void xs_local_data_receive(struct sock_xprt *transport)
}
if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
break;
if (need_resched()) {
mutex_unlock(&transport->recv_mutex);
cond_resched();
goto restart;
}
}
out:
mutex_unlock(&transport->recv_mutex);
@ -1096,6 +1102,7 @@ static void xs_udp_data_receive(struct sock_xprt *transport)
struct sock *sk;
int err;
restart:
mutex_lock(&transport->recv_mutex);
sk = transport->inet;
if (sk == NULL)
@ -1109,6 +1116,11 @@ static void xs_udp_data_receive(struct sock_xprt *transport)
}
if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
break;
if (need_resched()) {
mutex_unlock(&transport->recv_mutex);
cond_resched();
goto restart;
}
}
out:
mutex_unlock(&transport->recv_mutex);
@ -1528,16 +1540,16 @@ static void xs_tcp_data_receive(struct sock_xprt *transport)
.arg.data = xprt,
};
unsigned long total = 0;
int loop;
int read = 0;
restart:
mutex_lock(&transport->recv_mutex);
sk = transport->inet;
if (sk == NULL)
goto out;
/* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
for (loop = 0; loop < 64; loop++) {
for (;;) {
rd_desc.count = RPC_TCP_READ_CHUNK_SZ;
lock_sock(sk);
read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
@ -1548,6 +1560,11 @@ static void xs_tcp_data_receive(struct sock_xprt *transport)
}
release_sock(sk);
total += read;
if (need_resched()) {
mutex_unlock(&transport->recv_mutex);
cond_resched();
goto restart;
}
}
if (test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
queue_work(xprtiod_workqueue, &transport->recv_worker);