Re: marching through all physical memory in software

From: Nigel Cunningham
Date: Fri Jan 30 2009 - 08:00:42 EST

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.



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