From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.91] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1GTMWV-0000EI-99 for user-mode-linux-devel@lists.sourceforge.net; Fri, 29 Sep 2006 10:51:43 -0700 Received: from aa011msr.fastwebnet.it ([85.18.95.71]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1GTMWU-0004wW-MV for user-mode-linux-devel@lists.sourceforge.net; Fri, 29 Sep 2006 10:51:43 -0700 Date: Fri, 29 Sep 2006 19:46:01 +0200 From: Mattia Dongili Message-ID: <20060929174601.GF13444@inferi.kami.home> References: <2flhcyrq2nr.fsf@saruman.uio.no> <20060928194727.GC8519@inferi.kami.home> <20060928215143.GC6327@ccure.user-mode-linux.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20060928215143.GC6327@ccure.user-mode-linux.org> Subject: Re: [uml-devel] [Pkg-uml-pkgs] How is user-mode-linux using /dev/shm/? List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: user-mode-linux-devel-bounces@lists.sourceforge.net Errors-To: user-mode-linux-devel-bounces@lists.sourceforge.net To: Jeff Dike Cc: User Mode Linux Maintainers , pkg-sysvinit-devel@lists.alioth.debian.org, Paolo Giarrusso , UML-devel , Petter Reinholdtsen On Thu, Sep 28, 2006 at 05:51:43PM -0400, Jeff Dike wrote: > On Thu, Sep 28, 2006 at 09:47:27PM +0200, Mattia Dongili wrote: > > On Thu, Sep 28, 2006 at 08:14:32PM +0200, Petter Reinholdtsen wrote: > > > To make some writable tmpfs available to those in need of such system, > > > and to avoid using /dev/shm/ which is reserved for the shm-functions, > > > I just uploaded sysvinit version 2.86.ds1-26. It will mount a tmpfs > > > on /lib/init/rw/ that can be used instead. If /lib/init/rw/.ramfs > > > exist, that mount point is a tmpfs. I'm not sure if this last change > > > will make it into Etch or not, but I hope so, to solve any problems > > > with packages previously using /dev/shm/ as a generic tmpfs file > > > system. > > > > Well, I'd actually prefer if you could remove the noexec flag from > > /dev/shm. I understand the security reasons given in the bugreport but > > I'd prefer avoid having to deal with one more Debian-only (is it?) > > thing given the soon to come general freeze. > > UML needs a non-noexec place to keep a file that will be used as its > physical memory. A tmpfs mount is greatly preferred for performance > reasons as well as tmpfs being the only filesystem supporting > MADV_REMOVE, which is used for memory hotplug. Thinking of a Debian only fix for the above, does simply playing with default_tmpdir in arch/um/os-Linux/mem.c (probably in which_tmpdir()) suffice to use /lib/init/rw/.ramfs as default? (Yes I should try it... will try to find some time next week) Thanks -- mattia :wq! ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel