linux-kernel - Re: marching through all physical memory in software

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Date:	Sat, 31 Jan 2009 00:00:51 +1100
From:	Nigel Cunningham <ncunningham-lkml@...a.org.au>
To:	Pavel Machek <pavel@...e.cz>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Chris Friesen <cfriesen@...tel.com>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, Doug Thompson <norsk5@...oo.com>,
	linux-mm@...ck.org, bluesmoke-devel@...ts.sourceforge.net
Subject: Re: marching through all physical memory in software

Hi again.

On Fri, 2009-01-30 at 10:13 +0100, Pavel Machek wrote:
> > Hi.
> > 
> > On Wed, 2009-01-28 at 20:38 +0100, Pavel Machek wrote:
> > > You can do the scrubbing today by echo reboot > /sys/power/disk; echo
> > > disk > /sys/power/state :-)... or using uswsusp APIs.
> > 
> > That won't work. The RAM retains its contents across a reboot, and even
> > for a little while after powering off.
> 
> Yes, and the original goal was to rewrite all the memory with same
> contents so that parity errors don't accumulate. SO scrubbing here !=
> trying to clear it.

Sorry - I think I missed something.

AFAICS, hibernating is going to be a noop as far as doing anything to
memory that's not touched by the process of hibernating goes. It won't
clear it or scrub it or anything else.

Regards,

Nigel

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