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Subject: Re: [PATCH V2] MCE: fix an error of mce_bad_pages statistics
From: Simon Jeons <simon.jeons@gmail.com>
To: Andi Kleen <andi@firstfloor.org>
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Date: Mon, 10 Dec 2012 20:14:31 -0600
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On Tue, 2012-12-11 at 03:03 +0100, Andi Kleen wrote:
> > IIUC, soft offlining will isolate and migrate hwpoisoned page, and this
> > page will not be accessed by memory management subsystem until unpoison,
> > correct?
> 
> No, soft offlining can still allow accesses for some time. It'll never kill
> anything.

Oh, it will be putback to lru list during migration. So does your "some
time" mean before call check_new_page?

	               -Simon 

> 
> Hard tries much harder and will kill.
> 
> In some cases (unshrinkable kernel allocation) they end up doing the same
> because there isn't any other alternative though. However these are
> expected to only apply to a small percentage of pages in a typical
> system.
> 
> -Andi