From: Nigel Cunningham <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
Subject: Re: marching through all physical memory in software
Date: Sat, 31 Jan 2009 00:00:51 +1100 [thread overview]
Message-ID: <1233320451.11332.13.camel@nigel-laptop> (raw)
In-Reply-To: <20090130091304.GA9495@atrey.karlin.mff.cuni.cz>
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
WARNING: multiple messages have this Message-ID (diff)
From: Nigel Cunningham <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
Subject: Re: marching through all physical memory in software
Date: Sat, 31 Jan 2009 00:00:51 +1100 [thread overview]
Message-ID: <1233320451.11332.13.camel@nigel-laptop> (raw)
In-Reply-To: <20090130091304.GA9495@atrey.karlin.mff.cuni.cz>
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
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2009-01-30 13:00 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-26 15:38 marching through all physical memory in software Chris Friesen
2009-01-26 15:59 ` Arjan van de Ven
2009-01-27 18:29 ` Chris Friesen
2009-01-27 20:16 ` Eric W. Biederman
2009-01-27 20:16 ` Eric W. Biederman
2009-01-28 19:38 ` Pavel Machek
2009-01-28 19:38 ` Pavel Machek
2009-01-30 9:05 ` Nigel Cunningham
2009-01-30 9:05 ` Nigel Cunningham
2009-01-30 9:13 ` Pavel Machek
2009-01-30 9:13 ` Pavel Machek
2009-01-30 13:00 ` Nigel Cunningham [this message]
2009-01-30 13:00 ` Nigel Cunningham
2009-03-05 22:16 ` [Patch] mm tracepoints Larry Woodman
2009-03-06 2:11 ` KOSAKI Motohiro
2009-03-06 2:26 ` Steven Rostedt
2009-03-06 11:04 ` Ingo Molnar
2009-03-06 12:33 ` Larry Woodman
2009-03-06 13:55 ` Ingo Molnar
2009-03-06 16:57 ` Larry Woodman
2009-03-06 17:10 ` Ingo Molnar
2009-03-06 17:38 ` Peter Zijlstra
2009-03-06 17:46 ` Ingo Molnar
2009-03-06 17:56 ` Peter Zijlstra
2009-03-06 18:01 ` Ingo Molnar
2009-03-06 18:20 ` Peter Zijlstra
2009-03-06 18:24 ` Ingo Molnar
2009-03-06 20:01 ` Larry Woodman
2009-03-06 19:06 ` Larry Woodman
2009-03-06 21:53 ` Chris Friesen
2009-03-06 19:22 ` Larry Woodman
2009-03-25 18:09 ` Latest mm tracepoints patch merged to your tip tree Larry Woodman
2009-03-06 21:16 ` [Patch] mm tracepoints Andrew Morton
2009-03-06 21:16 ` Andrew Morton
2009-02-06 9:00 ` marching through all physical memory in software Andi Kleen
2009-02-07 3:03 ` Henrique de Moraes Holschuh
[not found] <715599.77204.qm@web50111.mail.re2.yahoo.com>
2009-01-30 19:32 ` Eric W. Biederman
2009-01-30 19:32 ` Eric W. Biederman
2009-01-30 20:20 ` Tim Small
2009-01-30 20:20 ` Tim Small
2009-01-31 3:54 ` Eric W. Biederman
2009-01-31 3:54 ` Eric W. Biederman
2009-01-31 12:48 ` Tim Small
2009-01-31 12:48 ` Tim Small
2009-01-31 13:43 ` Henrique de Moraes Holschuh
2009-01-31 13:43 ` Henrique de Moraes Holschuh
2009-01-31 21:27 ` Pavel Machek
2009-01-31 21:27 ` Pavel Machek
2009-02-01 1:25 ` Henrique de Moraes Holschuh
2009-02-01 1:25 ` Henrique de Moraes Holschuh
2009-01-30 21:10 ` Nigel Cunningham
2009-01-30 21:10 ` Nigel Cunningham
2009-02-02 18:29 ` Chris Friesen
2009-02-02 18:29 ` Chris Friesen
2009-02-02 22:45 ` Valdis.Kletnieks
2009-02-03 14:31 ` Chris Friesen
2009-02-03 14:31 ` Chris Friesen
2009-02-03 22:25 ` Pavel Machek
2009-02-03 22:25 ` Pavel Machek
2009-02-04 16:03 ` Chris Friesen
2009-02-04 16:03 ` Chris Friesen
2009-02-04 16:47 ` Dave Jiang
2009-02-04 16:47 ` Dave Jiang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1233320451.11332.13.camel@nigel-laptop \
--to=ncunningham-lkml@crca.org.au \
--cc=arjan@infradead.org \
--cc=bluesmoke-devel@lists.sourceforge.net \
--cc=cfriesen@nortel.com \
--cc=ebiederm@xmission.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=norsk5@yahoo.com \
--cc=pavel@suse.cz \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.