Date: Wed, 27 Nov 2002 11:46:09 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: John Baldwin <jhb@FreeBSD.org> Cc: Luigi Rizzo <rizzo@icir.org>, arch@FreeBSD.ORG, rwatson@FreeBSD.ORG, phk@critter.freebsd.dk, "M. Warner Losh" <imp@bsdimp.com> Subject: Re: ABIs and 5.x branch: freeze kernel module ABI at 5.0 or 5.1? Message-ID: <Pine.BSF.4.21.0211271143570.52749-100000@InterJet.elischer.org> In-Reply-To: <XFMail.20021127083338.jhb@FreeBSD.org>
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On Wed, 27 Nov 2002, John Baldwin wrote: > > On 27-Nov-2002 Luigi Rizzo wrote: > > On Tue, Nov 26, 2002 at 11:29:04PM -0800, Julian Elischer wrote: > > ... > >> > That's my view as well. However, while we don't want to unduely > >> > constrain the developers, I think that the project wants to say "don't > >> > change the ABIs needlessly." Don't resort values just to resort them, > >> > don't rearrange structure members just because you can, etc. If you > >> > need to do it for a compelling reason, then that's OK. > >> > >> which is why I think we should reserve some fields now... > > > > I don't see much need for it. > > > > We have a nice infrastructure (m_tags) to carry info together with > > mbufs. ifnet's can be easily extended in much the same way used by > > the bridging code (by using the if_index to point into external > > arrays containing specific extensions); processes/threads/kseg have > > the extra pointer/room for custom schedulers... I think the > > usual suspects are all covered. > > He wants to add spare fields to proc/thread/kse/kseg. I don't > particularly like doing it since IMO it isn't very clean, but > that's just my opinion. I'm not hell bent on it.. it just may reduce the amount of module incompatibilities we see over the next couple of releases.. I also was thinking og th eifnet structure.. there are afew projects in the wings that will want to put pointers there.. e.g. the stack virtualisation that PHK raved about.. > > -- > > John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ > "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-arch" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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