Date: Tue, 25 Jan 2005 01:49:35 +0000 From: Bruce M Simpson <bms@spc.org> To: Ryan Sommers <ryans@gamersimpact.com> Cc: =?iso-8859-1?Q?Jo=E3o_Carlos_Mendes_Lu=EDs?= <jonny@jonny.eng.br> Subject: Re: Resuming from a crashdump Message-ID: <20050125014935.GD47638@dhcp120.icir.org> In-Reply-To: <41F5A2DE.5000306@gamersimpact.com> References: <86pszu639o.fsf@borg.borderworlds.dk> <86brbe6052.fsf@borg.borderworlds.dk> <Pine.BSI.4.58L.0501241423530.27294@vp4.netgate.net> <200501242240.j0OMeIXP043763@apollo.backplane.com> <41F59242.7090900@jonny.eng.br> <41F5A2DE.5000306@gamersimpact.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, Jan 24, 2005 at 07:37:34PM -0600, Ryan Sommers wrote: > My little knowledge on this subject aside. I'd love to have full > suspend/resume functionality. It'd make my life as a mobile freebsd user > much much easier. However, I wouldn't want it at the expense of every > kernel. It would need to be something completely modular. I think what we're also looking at is aborting any pending bus-mastering transactions. This could probably be done as a part of the newbus suspend/resume routines for bus and device drivers, but it also means that the other entry points need to be able to deal with the carpet being dragged out from under them like this. In the case of a networking driver, particularly Ethernet, things are somewhat easier, and the more help you get from the hardware the better; but some cards like those based around ATM SARS just plain aren't designed to deal with the carpet being dragged out - they expect to keep rolling through their descriptor rings, segmenting and transmitting what they see. If we could take a clean subsystem-by-subsystem approach to marshaling kernel state to disk, that would be good. What gives me particular pain here is dealing with things like the filesystem. How does one deal with open files, etc, with pending I/O? Just my 2c, BMS
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20050125014935.GD47638>