From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752946AbYHLGx6 (ORCPT ); Tue, 12 Aug 2008 02:53:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751457AbYHLGxt (ORCPT ); Tue, 12 Aug 2008 02:53:49 -0400 Received: from courier.cs.helsinki.fi ([128.214.9.1]:56316 "EHLO mail.cs.helsinki.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751396AbYHLGxs (ORCPT ); Tue, 12 Aug 2008 02:53:48 -0400 Message-ID: <48A1329F.6000602@cs.helsinki.fi> Date: Tue, 12 Aug 2008 09:50:07 +0300 From: Pekka Enberg User-Agent: Thunderbird 2.0.0.16 (Macintosh/20080707) MIME-Version: 1.0 To: Christoph Lameter CC: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Mel Gorman , andi@firstfloor.org, Rik van Riel , mpm@selenic.com, Dave Chinner Subject: Re: [patch 00/19] Slab Fragmentation Reduction V14 References: <20080811150616.207532384@quilx.com> In-Reply-To: <20080811150616.207532384@quilx.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Christoph Lameter wrote: > V13->V14 > - Rediff against linux-next on request of Andrew > - TestSetPageLocked -> trylock_page conversion. > > Slab fragmentation is mainly an issue if Linux is used as a fileserver > and large amounts of dentries, inodes and buffer heads accumulate. In some > load situations the slabs become very sparsely populated so that a lot of > memory is wasted by slabs that only contain one or a few objects. In > extreme cases the performance of a machine will become sluggish since > we are continually running reclaim without much succes. > Slab defragmentation adds the capability to recover the memory that > is wasted. Applied, thanks!