From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [PATCH net-next] net: cache skb_shinfo() in skb_try_coalesce() Date: Wed, 04 Oct 2017 11:34:33 -0700 (PDT) Message-ID: <20171004.113433.608816562592951176.davem@davemloft.net> References: <1507139315.14419.5.camel@edumazet-glaptop3.roam.corp.google.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: eric.dumazet@gmail.com Return-path: Received: from shards.monkeyblade.net ([184.105.139.130]:49498 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751177AbdJDSeg (ORCPT ); Wed, 4 Oct 2017 14:34:36 -0400 In-Reply-To: <1507139315.14419.5.camel@edumazet-glaptop3.roam.corp.google.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Eric Dumazet Date: Wed, 04 Oct 2017 10:48:35 -0700 > From: Eric Dumazet > > Compiler does not really know that skb_shinfo(to|from) are constants > in skb_try_coalesce(), lets cache their values to shrink code. > > We might even take care of skb_zcopy() calls later. > > $ size net/core/skbuff.o.before net/core/skbuff.o > text data bss dec hex filename > 40727 1298 0 42025 a429 net/core/skbuff.o.before > 40631 1298 0 41929 a3c9 net/core/skbuff.o > > > Signed-off-by: Eric Dumazet Applied.