Subject: Re: marching through all physical memory in software
From: Nigel Cunningham <ncunningham-lkml@crca.org.au>
Reply-To: ncunningham-lkml@crca.org.au
To: Pavel Machek <pavel@suse.cz>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
       Chris Friesen <cfriesen@nortel.com>,
       Arjan van de Ven <arjan@infradead.org>, linux-kernel@vger.kernel.org,
       Doug Thompson <norsk5@yahoo.com>, linux-mm@kvack.org,
       bluesmoke-devel@lists.sourceforge.net
In-Reply-To: <20090128193813.GD1222@ucw.cz>
References: <497DD8E5.1040305@nortel.com>
	 <20090126075957.69b64a2e@infradead.org> <497F5289.404@nortel.com>
	 <m1vds0bj2j.fsf@fess.ebiederm.org>  <20090128193813.GD1222@ucw.cz>
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Date: Fri, 30 Jan 2009 20:05:24 +1100
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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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