From mboxrd@z Thu Jan 1 00:00:00 1970 From: Al Viro Subject: Re: [PATCH] VFS: Cut down inode->i_op->xyz accesses in path walking Date: Sun, 7 Aug 2011 07:51:26 +0100 Message-ID: <20110807065126.GW2203@ZenIV.linux.org.uk> References: <20110726030531.GE22133@ZenIV.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Christoph Hellwig , linux-fsdevel To: Linus Torvalds Return-path: Received: from zeniv.linux.org.uk ([195.92.253.2]:50189 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750747Ab1HGGv2 (ORCPT ); Sun, 7 Aug 2011 02:51:28 -0400 Content-Disposition: inline In-Reply-To: Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Sat, Aug 06, 2011 at 11:06:18PM -0700, Linus Torvalds wrote: > My timings still showed roughly a 2% improvement (well 1.8% on the > "repeat ten times, do the average") but I didn't really do a lot of > deviation testing. The noise in the numbers is quite noticeable > between reboots, but I've seen that 1-2% several times over various > different implementations of the same "try to avoid touching > inode->i_op->xyz", so I'm pretty convinced it's not just random noise. Trivial nit: s/do_follow_link/should_follow_link/, I think...