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

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Message-ID: <4E04C5EC.2090602@zytor.com>
Date:	Fri, 24 Jun 2011 10:14:20 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Rick van Rein <rick@...rein.org>
CC:	"Luck, Tony" <tony.luck@...el.com>,
	Craig Bergstrom <craigb@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stefan Assmann <sassmann@...nic.de>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"rdunlap@...otime.net" <rdunlap@...otime.net>
Subject: Re: [PATCH v2 0/3] support for broken memory modules (BadRAM)

On 06/24/2011 09:56 AM, Rick van Rein wrote:
> Hello,
> 
>> Does it scale? [...] Perhaps we may end up with a composite solution. 
> 
> If I had my way, there would be an extension to the e820 format to allow
> the BadRAM patterns to be specified.  Since the extension with bad page
> information is specific to boot loader interaction, this would work in
> exactly those cases that are covered by the current situation.
> 

Yes, a different table might be worthwhile.

Another question, however, is what does this look like at runtime.  In
particular, if I'm not mistaken hwpoison will create struct pages for
these non-memory pages, which seems undesirable...

	-hpa

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