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tcp: small optimization in tcp recvmsg()

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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 <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2021-11-15 11:02:40 -08:00 committed by David S. Miller
parent 91b6d32563
commit 93afcfd1db
1 changed files with 1 additions and 2 deletions
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3
net/ipv4/tcp.c
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@ -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);
}