From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: [PATCH net-next] net: allow better page reuse in splice(sock -> pipe) Date: Thu, 19 Apr 2012 21:38:17 +0200 Message-ID: <1334864297.2395.220.camel@edumazet-glaptop> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: netdev To: David Miller Return-path: Received: from mail-bk0-f46.google.com ([209.85.214.46]:57232 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932254Ab2DSTiX (ORCPT ); Thu, 19 Apr 2012 15:38:23 -0400 Received: by bkcik5 with SMTP id ik5so6666694bkc.19 for ; Thu, 19 Apr 2012 12:38:21 -0700 (PDT) Sender: netdev-owner@vger.kernel.org List-ID: From: Eric Dumazet splice() from socket to pipe needs linear_to_page() helper to transfert skb header to part of page. We can reset the offset in the current sk->sk_sndmsg_page if we are the last user of the page. Signed-off-by: Eric Dumazet --- net/core/skbuff.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 43c490d..bf257de 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -1565,6 +1565,9 @@ new_page: } else { unsigned int mlen; + /* If we are the only user of the page, we can reset offset */ + if (page_count(p) == 1) + sk->sk_sndmsg_off = 0; off = sk->sk_sndmsg_off; mlen = PAGE_SIZE - off; if (mlen < 64 && mlen < *len) {