linux-kernel - Re: [PATCH 0/2] Kexec jump: The first step to kexec base hibernation

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Date:	Tue, 24 Jul 2007 17:27:34 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Huang, Ying" <ying.huang@...el.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Pavel Machek" <pavel@....cz>, nigel@...el.suspend2.net,
	"Jeremy Maitin-Shepard" <jbms@....edu>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	"Kexec Mailing List" <kexec@...ts.infradead.org>
Subject: Re: [PATCH 0/2] Kexec jump: The first step to kexec base hibernation

On Tuesday, 24 July 2007 16:00, Huang, Ying wrote:
> >From: Rafael J. Wysocki [mailto:rjw@...k.pl]
> >This is not the point.  There are memory regions that you should not
> _restore_,
> >because that will cause harm.
> >
> >> On x86_64, there is another usage of nosave during processing E820
> >> memory map. But I don't know why the memory region other than
> E820_RAM
> >> are marked as nosave. I think only the memory region of type E820_RAM
> >> will be thought of normal memory, others will be thought as reserved.
> Is
> >> it sufficient just to check whether the page is reserved?
> >
> >No, it's not.
> 
> The "/proc/iomem" records information of all memory regions including
> "normal RAM" and all kinds of reserved regions, which is backed by
> iomem_resource. On x86_64, it is initialized in the exact same way as
> nosave region initialization.
> 
> I think maybe we can replace the "nosave region" concepts with
> "iomem_resource" (maybe need some enhancement).

Yes, I think that might be done.

Geetings,
Rafael


-- 
"Premature optimization is the root of all evil." - Donald Knuth
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