linux-kernel - Re: [PATCH] x86_64: early memtest to find bad ram

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Message-ID: <alpine.LNX.1.00.0803212221390.10642@fbirervta.pbzchgretzou.qr>
Date:	Fri, 21 Mar 2008 22:22:47 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Ingo Molnar <mingo@...e.hu>
cc:	yhlu.kernel@...il.com, Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86_64: early memtest to find bad ram


On Mar 21 2008 13:03, Ingo Molnar wrote:
> * Yinghai Lu <yhlu.kernel.send@...il.com> wrote:
>
>> do simple memtest after init_memory_mapping
>> use find_e820_area_size to find all ram range that is not reserved.
>> and do some simple bits test to find some bad ram.
>> if find some bad ram, use reserve_early to exclude that range.
>
> very nice patch! I always thought that this was the proper way to do
> memtest - and we could in fact also do something like this after SMP
> bringup, and hit the memory bus via multiple CPUs. [that will need a
> different enumeration though than e820 maps]

Perhaps this can even be used to provide on-the-fly badram
patch semantics?
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