linux-kernel - Re: [linux-pm] Re: Hibernation considerations

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Date:	Sun, 22 Jul 2007 10:17:14 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	david@...g.hm
Cc:	Milton Miller <miltonm@....com>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J.Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	Jeremy Maitin-Shepard <jbms@....edu>
Subject: Re: [linux-pm] Re: Hibernation considerations

On Fri, 2007-07-20 at 08:48 -0700, david@...g.hm wrote:
> > Backuping target memory before kexec and restoring it after kexec is
> > planed feature for kexec jump. But I will work on image writing/reading
> > first.
> 
> if we can get a list of what memory is safe to backup/restore then the 
> reading/writing of the image should be able to be done in userspace.

The backup/restore here has nothing to do with the read/write of the
image. It means instead of preserving memory for a new kernel like that
of crash-dump, the memory for a new kernel is backupped before kexec and
restored after kexec by the kexec kernel.

> > If the "scatter copy" is replaced by "scatter swap", we need not the
> > inverse list, and the state of kexeced kernel can be backuped too. There
> > are "scatter copy" support in normal kexec implementation in
> > "relocate_kernel".
> 
> what do you mean by "scatter swap"

copy:	dest=src
swap:	tmp=dest; dest=src; src=tmp

If memory is swapped, no information is lost, both that of kexec kernel
and kexeced kernel.

Best Regards,
Huang, Ying
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