Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266837AbUI0RNO (ORCPT ); Mon, 27 Sep 2004 13:13:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266833AbUI0RNN (ORCPT ); Mon, 27 Sep 2004 13:13:13 -0400 Received: from MAIL.13thfloor.at ([212.16.62.51]:6547 "EHLO mail.13thfloor.at") by vger.kernel.org with ESMTP id S266813AbUI0RM4 (ORCPT ); Mon, 27 Sep 2004 13:12:56 -0400 Date: Mon, 27 Sep 2004 19:12:53 +0200 From: Herbert Poetzl To: Marcelo Tosatti Cc: 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: <20040927171253.GA9728@MAIL.13thfloor.at> Mail-Followup-To: Marcelo Tosatti , jonathan@jonmasters.org, Lars Marowsky-Bree , Alan Cox , Thomas Habets , Linux Kernel Mailing List 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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040927133554.GD30956@logos.cnet> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1657 Lines: 41 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? 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) best, Herbert > Makes sense yes. > > - > 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/ - 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/