linux-kernel - Re: [linux-pm] [PATCH] hibernation should work ok with memory hotplug

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Message-Id: <1226004406.6876.5.camel@nigel-laptop>
Date:	Fri, 07 Nov 2008 07:46:46 +1100
From:	Nigel Cunningham <ncunningham@...a.org.au>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Matt Tolentino <matthew.e.tolentino@...el.com>,
	linux-pm@...ts.osdl.org, Dave Hansen <haveblue@...ibm.com>,
	linux-kernel@...r.kernel.org,
	Dave Hansen <dave@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	pavel@...e.cz, Mel Gorman <mel@...net.ie>,
	Andy Whitcroft <apw@...dowen.org>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [linux-pm] [PATCH] hibernation should work ok with memory
	hotplug

Hi.

On Thu, 2008-11-06 at 09:48 -0500, Alan Stern wrote:
> On Thu, 6 Nov 2008, Nigel Cunningham wrote:
> 
> > Remember that when we hibernate (assuming we don't then suspend to ram),
> > the power is fully off. Resuming starts off like a fresh boot.
> 
> That simply is not true.  On ACPI systems, hibernation goes into the S4 
> state.  Power fully off is S5.

For the purposes of our discussion, it was a good enough description.
Nevertheless, you're right - if we do everything in a fully ACPI spec
compliant way, there will still be some power around. Of course we don't
always do that (can use S4 or S5).

Regards,

Nigel

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