linux-kernel - Re: [linux-pm] [PATCH -mm] kexec jump -v9

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Date:	Wed, 12 Mar 2008 11:01:49 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Huang, Ying" <ying.huang@...el.com>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>, <nigel@...el.suspend2.net>,
	Kexec Mailing List <kexec@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-pm@...ts.linux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [linux-pm] [PATCH -mm] kexec jump -v9

On Wed, 12 Mar 2008, Huang, Ying wrote:

> I think "kexec based hibernation" is the only currently available
> possible method to write out image without freezer (after driver works
> are done). If other process is running, how to prevent them from writing
> to disk without freezing them in current implementation?

This is a very good question.

It's a matter of managing the block layer's request queues.  Somehow 
the existing I/O requests must remain blocked while the requests needed 
for writing the image must be allowed to proceed.

I don't know what would be needed to make this work, but it ought to be 
possible somehow...

Alan Stern

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