Re: More thoughts about hwpoison and pageflags compression [LWN.net]

From:		Andrew Morton <akpm-AT-linux-foundation.org>
To:		Andi Kleen <andi-AT-firstfloor.org>
Subject:		Re: More thoughts about hwpoison and pageflags compression
Date:		Fri, 29 May 2009 23:53:02 -0700
Message-ID:		<20090529235302.ccf58d88.akpm@linux-foundation.org>
Cc:		Alan Cox <alan-AT-lxorguk.ukuu.org.uk>, linux-kernel-AT-vger.kernel.org, linux-mm-AT-kvack.org, fengguang.wu-AT-intel.com
Archive-link:		Article, Thread

On Sat, 30 May 2009 08:37:10 +0200 Andi Kleen <andi@firstfloor.org> wrote:

> So using a separate bit is a sensible choice imho.

Could you make the feature 64-bit-only and use one of bits 32-63?

Did you consider making the poison tag external to the pageframe?  Some
hash(page*) into a bitmap or something?  If suitably designed, such
infrastructure could perhaps be reused to reclaim some existing page
flags.  Dave Hansen had such a patch a few years back.  Or maybe it
was Andy Whitcroft.

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