linux-kernel - Re: Back to the future.

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Message-Id: <200704280004.47683.rjw@sisk.pl>
Date:	Sat, 28 Apr 2007 00:04:47 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Pekka J Enberg <penberg@...helsinki.fi>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Back to the future.

On Friday, 27 April 2007 23:44, Linus Torvalds wrote:
> 
> On Fri, 27 Apr 2007, Rafael J. Wysocki wrote:
> > 
> > Why do you think that keeping the user space frozen after 'snapshot' is a bad
> > idea?  I think that solves many of the problems you're discussing.
> 
> It makes it harder to debug (wouldn't it be *nice* to just ssh in, and do
> 
> 	gdb -p <snapshotter>
> 
> when something goes wrong?) but we also *depend* on user space for various 
> things (the same way we depend on kernel threads, and why it has been such 
> a total disaster to try to freeze the kernel threads too!).

We're freezing many of them just fine. ;-)

> For example, if you want to do graphical stuff, just using X would be quite
> nice, wouldn't it?

Yes, it would, but as long as we can't protect mounted filesystems from being
touched, it's just dangerous to let the user space run at that point.

> But I do agree that doing everythign in the kernel is likely to just be a 
> hell of a lot simpler for everybody.

:-)

Greetings,
Rafael
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