sieni
/
linux
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

udp: update sk_rmem_alloc before busylock acquisition 

Avoid piling too many producers on the busylock
by updating sk_rmem_alloc before busylock acquisition.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250916160951.541279-7-edumazet@google.com
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Eric Dumazet 2025-09-16 16:09:47 +00:00 committed by Paolo Abeni
parent 9aaec660b5
commit faf7b4aefd
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
net/ipv4/udp.c
View File

@ -1753,13 +1753,16 @@ int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb)
if (rmem > (rcvbuf >> 1)) {
skb_condense(skb);
size = skb->truesize;
rmem = atomic_add_return(size, &sk->sk_rmem_alloc);
if (rmem > rcvbuf)
goto uncharge_drop;
busy = busylock_acquire(sk);
} else {
atomic_add(size, &sk->sk_rmem_alloc);
}
udp_set_dev_scratch(skb);
atomic_add(size, &sk->sk_rmem_alloc);
spin_lock(&list->lock);
err = udp_rmem_schedule(sk, size);
if (err) {