From ede5a9a4a55eeb1189d489ed8a6cbafe7497e64d Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 15 Nov 2021 11:02:40 -0800 Subject: [PATCH] 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(-) diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 862e8cb8dda51..24d77a32c9cbc 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); } -- 2.39.5