Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760946AbZD1H6g (ORCPT ); Tue, 28 Apr 2009 03:58:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754067AbZD1H61 (ORCPT ); Tue, 28 Apr 2009 03:58:27 -0400 Received: from yw-out-2324.google.com ([74.125.46.31]:6908 "EHLO yw-out-2324.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753735AbZD1H60 convert rfc822-to-8bit (ORCPT ); Tue, 28 Apr 2009 03:58:26 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=Q1N3KfrCRvJc4fxbv6tVs5Cw1Ft8HNSxBLAETL7qnmJbjiUIQltvyeJQLa6IBGVN3a 2pvyPMX9NJQ9eBSN9qQ84fNPhMjquCZeaMo533M3npKQ56V+H7hCLh+yAUm+BJaJKDlE W4opkRJe13KSVWTys9VwF3uIbbZhsF0qcfCHg= MIME-Version: 1.0 In-Reply-To: <1240904919.7620.73.camel@twins> References: <20090428044426.GA5035@eskimo.com> <20090428143019.EBBF.A69D9226@jp.fujitsu.com> <1240904919.7620.73.camel@twins> Date: Tue, 28 Apr 2009 13:28:25 +0530 X-Google-Sender-Auth: a33264b7b4311e20 Message-ID: <661de9470904280058ub16c66bi6a52d36ca4c2d52c@mail.gmail.com> Subject: Re: Swappiness vs. mmap() and interactive response From: Balbir Singh To: Peter Zijlstra Cc: KOSAKI Motohiro , Elladan , linux-kernel@vger.kernel.org, linux-mm , Rik van Riel Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1881 Lines: 47 On Tue, Apr 28, 2009 at 1:18 PM, Peter Zijlstra wrote: > On Tue, 2009-04-28 at 14:35 +0900, KOSAKI Motohiro wrote: >> (cc to linux-mm and Rik) >> >> >> > Hi, >> > >> > So, I just set up Ubuntu Jaunty (using Linux 2.6.28) on a quad core phenom box, >> > and then I did the following (with XFS over LVM): >> > >> > mv /500gig/of/data/on/disk/one /disk/two >> > >> > This quickly caused the system to. grind.. to... a.... complete..... halt. >> > Basically every UI operation, including the mouse in Xorg, started experiencing >> > multiple second lag and delays. ?This made the system essentially unusable -- >> > for example, just flipping to the window where the "mv" command was running >> > took 10 seconds on more than one occasion. ?Basically a "click and get coffee" >> > interface. >> >> I have some question and request. >> >> 1. please post your /proc/meminfo >> 2. Do above copy make tons swap-out? IOW your disk read much faster than write? >> 3. cache limitation of memcgroup solve this problem? >> 4. Which disk have your /bin and /usr/bin? >> > > FWIW I fundamentally object to 3 as being a solution. > memcgroup were not created to solve latency problems, but they do isolate memory and if that helps latency, I don't see why that is a problem. I don't think isolating applications that we think are not important and interfere or consume more resources than desired is a bad solution. > I still think the idea of read-ahead driven drop-behind is a good one, > alas last time we brought that up people thought differently. I vaguely remember the patches, but can't recollect the details. Balbir -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/