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

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Message-Id: <1233306324.11332.11.camel@nigel-laptop>
Date:	Fri, 30 Jan 2009 20:05:24 +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.

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 it's contents across a reboot, and even
for a little while after powering off.

Regards,

Nigel

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