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

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Message-ID: <20090615170726.GI31969@one.firstfloor.org>
Date:	Mon, 15 Jun 2009 19:07:26 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andi Kleen <andi@...stfloor.org>,
	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>,
	"H. Peter Anvin" <hpa@...or.com>,
	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)

> But then if you
> can't sort the resulting mess out because your patches are too limited
> its not useful yet is it.

With "too limited" you refer to unpoisioning?

Again very slowly:

- If you have a lot of errors you die eventually anyways.
- If you have a very low rate of errors (which is the normal case) you don't 
need unpoisioning because the memory lost for each error is miniscule.
- In the case of a hypervisor it's actually not memory lost, but only
guest physical address space, which is plenty on a 64bit system. You can 
eventually replace it by readding memory to a guest, but that's unlikely
to be needed.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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