linux-kernel - Re: [PATCH 00/22] HWPOISON: Intro (v5)

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Date:	Tue, 16 Jun 2009 13:58:15 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Russ Anderson <rja@....com>
CC:	Andi Kleen <andi@...stfloor.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Mel Gorman <mel@....ul.ie>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	"riel@...hat.com" <riel@...hat.com>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 00/22] HWPOISON: Intro (v5)

Russ Anderson wrote:
>>
>> However, the more fundamental thing is that it is always trivial to
>> promote an error to a higher severity; the opposite is not true.  As
>> such, it becomes an administrator-set policy, which is what it needs to be.
> 
> Good point.  On ia64 the recovery code is implemented as a kernel
> loadable module.  Installing the module turns on the feature.
> 
> That is handy for customer demos.  Install the module, inject a
> memory error, have an application read the bad data and get killed.
> Repeat a few times.  Then uninstall the module, inject a
> memory error, have an application read the bad data and watch
> the system panic.
> 
> Then it is the customer's choice to have it on or off.
> 

There are a number of ways to set escalation policy.  Modules isn't
necessarily the best, but it doesn't really matter what the exact
mechanism is.

	-hpa
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