Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266912AbUI0S37 (ORCPT ); Mon, 27 Sep 2004 14:29:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266193AbUI0S37 (ORCPT ); Mon, 27 Sep 2004 14:29:59 -0400 Received: from parcelfarce.linux.theplanet.co.uk ([195.92.249.252]:60070 "EHLO www.linux.org.uk") by vger.kernel.org with ESMTP id S267176AbUI0S21 (ORCPT ); Mon, 27 Sep 2004 14:28:27 -0400 Date: Mon, 27 Sep 2004 13:42:19 -0300 From: Marcelo Tosatti To: jonathan@jonmasters.org, Lars Marowsky-Bree , Alan Cox , Thomas Habets , Linux Kernel Mailing List Subject: Re: [PATCH] oom_pardon, aka don't kill my xlock Message-ID: <20040927164219.GA31645@logos.cnet> References: <200409230123.30858.thomas@habets.pp.se> <20040923234520.GA7303@pclin040.win.tue.nl> <1096031971.9791.26.camel@localhost.localdomain> <200409242158.40054.thomas@habets.pp.se> <1096060549.10797.10.camel@localhost.localdomain> <20040927104120.GA30364@logos.cnet> <20040927125441.GG3934@marowsky-bree.de> <35fb2e590409270612524c5fb9@mail.gmail.com> <20040927133554.GD30956@logos.cnet> <20040927171253.GA9728@MAIL.13thfloor.at> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040927171253.GA9728@MAIL.13thfloor.at> User-Agent: Mutt/1.5.5.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1521 Lines: 34 On Mon, Sep 27, 2004 at 07:12:53PM +0200, Herbert Poetzl wrote: > On Mon, Sep 27, 2004 at 10:35:54AM -0300, Marcelo Tosatti wrote: > > On Mon, Sep 27, 2004 at 02:12:26PM +0100, Jon Masters wrote: > > > Hi all, > > > > > > Just out of interest then...suppose we've got a loopback swap device > > > and that we can extend this by creating a new file or extending > > > somehow the existing one. > > > > > > What would be wrong with having the page reclaim algorithms use one of > > > the low memory watermarks as a trigger to call in to userspace to > > > extend the swap available if possible? This is probably what Microsoft > > > et al do with their "Windows is extending your virtual memory, yada > > > yada blah blah". Comments? Already done? > > > > You dont to change kernel code for that - make a script to monitor > > swap usage, as soon as it gets below a given watermark, you swapon > > whatever swapfile you want. > > hmm, sounds good, but what if next 'burst' of > swapped out data is larger than the watermark? Give the watermark a large enough value. > I'm no friend of the 'extend swap idea' so don't > get me wrong, but userspace can just reduce the > cases where you get out-of-swap, without support > from the kernel side (via some userspace helper). - 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/