From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755043Ab3BUXib (ORCPT ); Thu, 21 Feb 2013 18:38:31 -0500 Received: from ipmail06.adl6.internode.on.net ([150.101.137.145]:21498 "EHLO ipmail06.adl6.internode.on.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754741Ab3BUXi3 (ORCPT ); Thu, 21 Feb 2013 18:38:29 -0500 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AnIJAG6vJlF5LJe7/2dsb2JhbABFhWW2HIURgQUXc4IfAQEFOhwjEAgDGAklDwUlAyETiBG/LhWOGiI9B4NAA5Y1kF+DGw Date: Fri, 22 Feb 2013 10:38:18 +1100 From: Dave Chinner To: Waiman Long Cc: linux-fsdevel@vger.kernel.org, Alexander Viro , linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/4] dcache: make Oracle more scalable on large systems Message-ID: <20130221233818.GM26694@dastard> References: <1361299859-27056-1-git-send-email-Waiman.Long@hp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1361299859-27056-1-git-send-email-Waiman.Long@hp.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 19, 2013 at 01:50:55PM -0500, Waiman Long wrote: > It was found that the Oracle database software issues a lot of call > to the seq_path() kernel function which translates a (dentry, mnt) > pair to an absolute path. The seq_path() function will eventually > take the following two locks: Nobody should be doing reverse dentry-to-name lookups in a quantity sufficient for it to become a performance limiting factor. What is the Oracle DB actually using this path for? Cheers, Dave. -- Dave Chinner david@fromorbit.com