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

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Date:	Tue, 24 Jul 2007 22:00:04 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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

>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).

Best Regards,
Huang Ying
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