diff options
| author |   Eric Dumazet <edumazet@google.com> | 2021-11-15 11:02:40 -0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2021-11-16 13:10:34 +0000 |
| commit | 93afcfd1db35882921b2521a637c78755c27b02c (patch) | |
| tree | e5bd0dd1290a879e31023cef54113e98fb876611 | |
| parent | net: cache align tcp_memory_allocated, tcp_sockets_allocated (diff) | |
| download | linux-dev-93afcfd1db35882921b2521a637c78755c27b02c.tar.xz linux-dev-93afcfd1db35882921b2521a637c78755c27b02c.zip | |
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 <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/tcp.c | 3 |
1 files changed, 1 insertions, 2 deletions
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); } |