From 93afcfd1db35882921b2521a637c78755c27b02c Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 15 Nov 2021 11:02:40 -0800 Subject: tcp: small optimization in tcp recvmsg() When reading large chunks of data, incoming packets might be added to the backlog from BH. tcp recvmsg() detects the backlog queue is not empty, and uses a release_sock()/lock_sock() pair to process this backlog. We now have __sk_flush_backlog() to perform this a bit faster. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/tcp.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'net/ipv4/tcp.c') diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 862e8cb8dda5..24d77a32c9cb 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2409,8 +2409,7 @@ static int tcp_recvmsg_locked(struct sock *sk, struct msghdr *msg, size_t len, if (copied >= target) { /* Do not sleep, just process backlog. */ - release_sock(sk); - lock_sock(sk); + __sk_flush_backlog(sk); } else { sk_wait_data(sk, &timeo, last); } -- cgit v1.2.3