linux-kernel - Re: RFC: Implement hwpoison on free for soft offlining

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Date:	Fri, 15 Oct 2010 10:50:13 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org, fengguang.wu@...el.com,
	akpm@...ux-foundation.org
Subject: Re: RFC: Implement hwpoison on free for soft offlining

Andi Kleen <andi@...stfloor.org> writes:

> Here's a somewhat experimental patch to improve soft offlining
> in hwpoison, but allowing hwpoison on free for not directly
> freeable page types. It should work for nearly all
> left over page types that get eventually freed, so this makes
> soft offlining nearly universal. The only non handleable page
> types are now pages that never get freed.
>
> Drawback: It needs an additional page flag. Cannot set hwpoison
> directly because that would not be "soft" and cause errors.
>
> Since the flags are scarce on 32bit I only enabled it on 64bit.
>
> Comments?

I got a couple of positive comments and reviews and no negative comments.

So I assume noone has a problem with using up a 64bit page flag
for this. I plan to push this into linux-next after some delay
and then prepare it for merge later.

If there are any objections please speak up now.

Thanks,
-Andi

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