linux-kernel - Re: [PATCH 0/2] Migrate data off physical pages with corrected memory errors (Version 7)

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Message-Id: <1216667499.8806.79.camel@lappy>
Date:	Mon, 21 Jul 2008 13:11:39 -0600
From:	Alex Williamson <alex.williamson@...com>
To:	Russ Anderson <rja@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, mingo@...e.hu,
	tglx@...utronix.de, Tony Luck <tony.luck@...el.com>,
	linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org
Subject: Re: [PATCH 0/2] Migrate data off physical pages with corrected
	memory errors (Version 7)

On Sun, 2008-07-20 at 12:39 -0500, Russ Anderson wrote:
> On Sat, Jul 19, 2008 at 12:37:11PM +0200, Andi Kleen wrote:
> > If you really wanted to do this you probably should hook it up
> > to mcelog's (or the IA64 equivalent) DIMM database
> 
> Is there an IA64 equivalent?  I've looked at the x86_64 mcelog,
> but have not found a IA64 version.

There's a bit in the SAL error record that can tell you when the
platform thinks the page should be deallocated.  In the section header
(B2.2), ERROR_RECOVERY_INFO, bit 3 "Error threshold exceeded".  If you
use this bit, then it's a platform decision.  If you want pages to be
deallocated on the first hit, then have your SAL always set that bit.  I
believe HP systems do implement this bit in SAL using some kind of
heuristics.

	Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.

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