Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 24 Oct 2001 12:36:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 24 Oct 2001 12:36:08 -0400 Received: from alcove.wittsend.com ([130.205.0.10]:6109 "EHLO alcove.wittsend.com") by vger.kernel.org with ESMTP id ; Wed, 24 Oct 2001 12:35:59 -0400 Date: Wed, 24 Oct 2001 12:36:19 -0400 From: "Michael H. Warfield" To: Linus Torvalds Cc: Alan Cox , Benjamin Herrenschmidt , linux-kernel@vger.kernel.org, Patrick Mochel , Jonathan Lundell Subject: Re: [RFC] New Driver Model for 2.5 Message-ID: <20011024123619.A21416@alcove.wittsend.com> Mail-Followup-To: Linus Torvalds , Alan Cox , Benjamin Herrenschmidt , linux-kernel@vger.kernel.org, Patrick Mochel , Jonathan Lundell In-Reply-To:

Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.3.22.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 24, 2001 at 09:19:45AM -0700, Linus Torvalds wrote: > On Wed, 24 Oct 2001, Alan Cox wrote: > > Assuming you want to synchronize the raid before suspend - a reasonably > > policy but not essential then you'd have to shut down the raid before > > sd, then sd would let the devices shut down which lets the controller > > shutdown > I will _refuse_ to have a kernel suspend that synchronizes the raid etc. > That would make suspend/resume potentially take a _loong_ time. If you have Magic SysRq enabled, would that do the job prior to suspend? Typically with Pavel's swsusp package, I hit the Alt-SysRq-s before hitting Alt-SysRq-d to suspend him. Does Alt-SysRq-s synchronize a raid? Of course, at that point, the choice to take the "_loong_ time" is in user space - meat space, user space - since I chose to hit that key combination. > If you want to synchronize your raid thing, make the user-level thing that > triggers the suspend do it. Same goes for things like "sync network > filesystems" etc. This is not a kernel level issue, and the kernel > shouldn't even try to do it. What does the Alt-SysRq-s combination do about networks then? > If somebody has pending stuff over NFS and suspends, and when it comes > back it's not on the network any more, that is 100% equivalent to removing > a PCMCIA network card while running. It's supposed to work - but if you > lose data that's YOUR problem, not the kernels. > Linus Mike -- Michael H. Warfield | (770) 985-6132 | mhw@WittsEnd.com /\/\|=mhw=|\/\/ | (678) 463-0932 | http://www.wittsend.com/mhw/ NIC whois: MHW9 | An optimist believes we live in the best of all PGP Key: 0xDF1DD471 | possible worlds. A pessimist is sure of it! - 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/