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Date: Mon, 17 Jul 2017 10:22:06 +0800 From: Lin Zhang <xiaolou4617@...il.com> To: davem@...emloft.net Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org, Lin Zhang <xiaolou4617@...il.com> Subject: [PATCH net-next resubmit] skbuff: optimize the pull_pages code in __pskb_pull_tail() In the pull_pages code block, if the first frag size > eat, we can end the loop in advance to avoid extra copy. Signed-off-by: Lin Zhang <xiaolou4617@...il.com> --- net/core/skbuff.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index f990eb8..c00a1df 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -1720,6 +1720,10 @@ void *__pskb_pull_tail(struct sk_buff *skb, int delta) skb_shinfo(skb)->frags[k].page_offset += eat; skb_frag_size_sub(&skb_shinfo(skb)->frags[k], eat); eat = 0; + if (!i) { + k = skb_shinfo(skb)->nr_frags; + break; + } } k++; } -- 1.8.3.1
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