linux-kernel - Re: [PATCH v2 0/3] support for broken memory modules (BadRAM)

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Message-ID: <20110624005907.GP3263@one.firstfloor.org>
Date:	Fri, 24 Jun 2011 02:59:07 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Stefan Assmann <sassmann@...nic.de>,
	Matthew Garrett <mjg59@...f.ucam.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	tony.luck@...el.com, andi@...stfloor.org, mingo@...e.hu,
	rick@...rein.org, rdunlap@...otime.net
Subject: Re: [PATCH v2 0/3] support for broken memory modules (BadRAM)

On Thu, Jun 23, 2011 at 09:30:37AM -0700, H. Peter Anvin wrote:
> On 06/23/2011 08:37 AM, Stefan Assmann wrote:
> > 
> > According to Rick's reply in this thread a damaged row in a DIMM can
> > easily cause a few thousand entries in the e820 table because it doesn't
> > handle patterns. So the question I'm asking is, is it acceptable to
> > have an e820 table with thousands maybe ten-thousands of entries?
> > I really have no idea of the implications, maybe somebody else can
> > comment on that.
> > 
> 
> Given that that is what actually ends up happening in the kernel at some
> point anyway, 

hwpoison can poison most pages without any lists.  Read Stefan's original patch.

The only thing that needs list really is conflict handling with
early allocations.

-Andi
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