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| author | linzhang <xiaolou4617@gmail.com> | 2017-07-17 17:25:02 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-17 08:56:50 -0700 |
| commit | 3ccc6c6faaa93da70989177b91c7c3ef0df10937 (patch) | |
| tree | 4fcc27c0a605eae9a6a8740d5933c6030fc9837a /net/core/skbuff.c | |
| parent | b3a703c7a698bcc0938fe22ba74d32593ad6e662 (diff) | |
| download | linux-3ccc6c6faaa93da70989177b91c7c3ef0df10937.tar.gz linux-3ccc6c6faaa93da70989177b91c7c3ef0df10937.tar.bz2 linux-3ccc6c6faaa93da70989177b91c7c3ef0df10937.zip | |
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@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/skbuff.c')
| -rw-r--r-- | net/core/skbuff.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 8b11341ed69a..b352c6bcfb31 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -1719,6 +1719,8 @@ pull_pages: if (eat) { skb_shinfo(skb)->frags[k].page_offset += eat; skb_frag_size_sub(&skb_shinfo(skb)->frags[k], eat); + if (!i) + goto end; eat = 0; } k++; @@ -1726,6 +1728,7 @@ pull_pages: } skb_shinfo(skb)->nr_frags = k; +end: skb->tail += delta; skb->data_len -= delta; |