From: Nigel Cunningham <nigel@suspend2.net>
Organization: Suspend2.net
To: suspend2-devel@lists.suspend2.net
Subject: Re: Which is simpler? (Was Re: [Suspend2-devel] Re: [ 00/10] [Suspend2] Modules support.)
Date: Tue, 7 Feb 2006 06:25:45 +1000
User-Agent: KMail/1.9.1
Cc: Lee Revell <rlrevell@joe-job.com>, Rafael Wysocki <rjw@sisk.pl>,
       linux-kernel@vger.kernel.org, Pavel Machek <pavel@ucw.cz>
References: <20060201113710.6320.68289.stgit@localhost.localdomain> <200602061543.42174.nigel@suspend2.net> <1139251682.2791.290.camel@mindpipe>
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Hi.

On Tuesday 07 February 2006 04:48, Lee Revell wrote:
> On Mon, 2006-02-06 at 15:43 +1000, Nigel Cunningham wrote:
> > Hi.
> >
> > On Monday 06 February 2006 14:34, Lee Revell wrote:
> > > On Mon, 2006-02-06 at 14:02 +1000, Nigel Cunningham wrote:
> > > > (they now have to download extra
> > > > libraries to use the splashscreen, which were not required with
> > > > the bootsplash patch, and need to check whether an update to the
> > > > userui code
> > > > is required when updating the kernel)
> > >
> > > You could have avoided this problem by keeping the
> > > userspace<->kernel interface stable.
> >
> > True, but sometimes you need to make changes that do modify the
> > interface. If the interface involves more functionality, this will
> > happen more frequently.
>
> Well, all I can say is, it should have been obvious that putting a
> themeable UI in the kernel would not fly.

Agreed, but I think we have some confusion here.

I was talking about interactions between kernel space and userspace after=20
we started using the userspace interface. In particular, I was thinking of=
=20
the fact that the netlink message number kept changing due to changes in=20
the vanilla kernel. In the end, we just made it a command line option to=20
the userui.

My point for this conversation was different, though. If uswsusp ever does=
=20
fly, there are going to be flag days where users are going to have to=20
download new userspace code, perhaps new versions of libraries or new=20
libraries, run the compilation and reconfigure their initrds/ram-fses, all=
=20
just because they upgraded their kernel and want to continue to suspend to=
=20
disk. That is extra complexity introduced by using a userspace 'brain'=20
instead of having it in kernelspace.

Regards,

Nigel

=2D-=20
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