linux-kernel - Re: what's the incompatibility between hibernation and hotplug?memory

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Message-ID: <20080327233852.GA32617@elf.ucw.cz>
Date:	Fri, 28 Mar 2008 00:38:52 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: what's the incompatibility between hibernation and
	hotplug?memory

On Thu 2008-03-27 21:55:01, Rafael J. Wysocki wrote:
> On Thursday, 27 of March 2008, Jeremy Fitzhardinge wrote:
> > Pavel Machek wrote:
> > > Hi!
> > >
> > >   
> > >>> I noticed that Kconfig warns that hibernation and hotplug memory are not 
> > >>> compatible.  What's the issue?
> > >>>       
> > >> Generally, we might not be able to handle memory unplugged at a wrong time
> > >> (eg. after we've created the image).
> > >>
> > >> Which part of Kconfig says that exactly?
> > >>     
> > >
> > > Actually I believe it is simpler than that. We were not prepared to
> > > deal with memory holes in hibernation code, so we just disabled it in
> > > Kconfig...
> > 
> > Doesn't that mean its generally incompatible with non-flatmem memory 
> > arrangements rather than hotplug memory specifically?
> 
> No, it should work with NUMA nowadays, actually.
> 
> Perhaps it's worth trying it with hotplug memory and see what problems arise?

Good. I believe it is good chance it will work with hotplug, too... as
long as memory is not inserted/removed during suspend/resume.
									Pavel
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