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authorPaolo Abeni <pabeni@redhat.com>2017-06-12 12:23:42 +0300
committerDavid S. Miller <davem@davemloft.net>2017-06-12 17:01:29 +0300
commit0a463c78d25b9464b77311d9dda297550a2d6aa5 (patch)
tree87152851619730150299fe4acf3a7a0eff8a6f4b /include/linux/skbuff.h
parent3889a803e1da9bd7cd10d6504bf281ee7e55dfd6 (diff)
downloadlinux-0a463c78d25b9464b77311d9dda297550a2d6aa5.tar.xz
udp: avoid a cache miss on dequeue
Since UDP no more uses sk->destructor, we can clear completely the skb head state before enqueuing. Amend and use skb_release_head_state() for that. All head states share a single cacheline, which is not normally used/accesses on dequeue. We can avoid entirely accessing such cacheline implementing and using in the UDP code a specialized skb free helper which ignores the skb head state. This saves a cacheline miss at skb deallocation time. v1 -> v2: replaced secpath_reset() with skb_release_head_state() Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/skbuff.h')
-rw-r--r--include/linux/skbuff.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index decce3655a48..d66d4feaac86 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -880,10 +880,12 @@ static inline bool skb_unref(struct sk_buff *skb)
return true;
}
+void skb_release_head_state(struct sk_buff *skb);
void kfree_skb(struct sk_buff *skb);
void kfree_skb_list(struct sk_buff *segs);
void skb_tx_error(struct sk_buff *skb);
void consume_skb(struct sk_buff *skb);
+void consume_stateless_skb(struct sk_buff *skb);
void __kfree_skb(struct sk_buff *skb);
extern struct kmem_cache *skbuff_head_cache;