From f4a775d14489a801a5b8b0540e23ab82e2703091 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 22 Sep 2014 16:29:32 -0700 Subject: net: introduce __skb_header_release() While profiling TCP stack, I noticed one useless atomic operation in tcp_sendmsg(), caused by skb_header_release(). It turns out all current skb_header_release() users have a fresh skb, that no other user can see, so we can avoid one atomic operation. Introduce __skb_header_release() to clearly document this. This gave me a 1.5 % improvement on TCP_RR workload. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/core/skbuff.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'net/core/skbuff.c') diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 06a8feb10099..512dc7dcbc32 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -3179,7 +3179,7 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb) skb_shinfo(nskb)->frag_list = p; skb_shinfo(nskb)->gso_size = pinfo->gso_size; pinfo->gso_size = 0; - skb_header_release(p); + __skb_header_release(p); NAPI_GRO_CB(nskb)->last = p; nskb->data_len += p->len; @@ -3211,7 +3211,7 @@ merge: else NAPI_GRO_CB(p)->last->next = skb; NAPI_GRO_CB(p)->last = skb; - skb_header_release(skb); + __skb_header_release(skb); lp = p; done: -- cgit v1.2.3