Re: More thoughts about hwpoison and pageflags compression

[Andrew Morton]

On Sat, 30 May 2009 08:37:10 +0200 Andi Kleen <andi@xxxxxxxxxxxxxx> 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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