From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Chinner Subject: Re: [PATCH 0/4] dcache: make Oracle more scalable on large systems Date: Fri, 22 Feb 2013 10:38:18 +1100 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 Cc: linux-fsdevel@vger.kernel.org, Alexander Viro , linux-kernel@vger.kernel.org To: Waiman Long Return-path: Content-Disposition: inline In-Reply-To: <1361299859-27056-1-git-send-email-Waiman.Long@hp.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.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