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

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Message-ID: <Pine.LNX.4.44L0.0707201216460.3811-100000@iolanthe.rowland.org>
Date:	Fri, 20 Jul 2007 12:20:58 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Milton Miller <miltonm@....com>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Ying Huang <ying.huang@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, David Lang <david@...g.hm>,
	linux-pm <linux-pm@...ts.linux-foundation.org>,
	Jeremy Maitin-Shepard <jbms@....edu>
Subject: Re: [linux-pm] Re: Hibernation considerations

On Fri, 20 Jul 2007, Milton Miller wrote:

> > We can't do this unless we have frozen tasks (this way, or another) 
> > before
> > carrying out the entire operation.
> 
> What can't we do?   We've already worked with the drivers to quesce the 
> hardware and put any information to resume the device in ram.  Now we 
> ask them to put their device in low power mode so we can go to sleep.  
> Even if we schedule, the only thing userspace could touch is memory.   

Userspace can submit I/O requests.  Someone will have to audit every 
driver to make sure that such I/O requests don't cause a quiesced 
device to become active.  If the device is active, it will make the 
memory snapshot inconsistent with the on-device data.

Alan Stern

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