linux-kernel - RE: mm: how to check for kernel pages

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Message-ID: <MDEHLPKNGKAHNMBLJOLKMENMBFAC.davids@webmaster.com>
Date:	Sun, 4 Feb 2007 09:49:55 -0800
From:	"David Schwartz" <davids@...master.com>
To:	"Arjan van de Ven" <arjan@...radead.org>
Cc:	<linux-kernel@...r.kernel.org>
Subject: RE: mm: how to check for kernel pages

> Ok, so what everything should be checked?
>
> - PageReserved
> - PageSlab
> - PageLocked
> - PageBuddy
> - PageCompound
> - PageNosave
> - PageNosaveFree
> - kernel page
> - userspace active DMA as you've mentioned. But I don't know how to test
>   it

Perhaps I'm missing something obvious, but shouldn't this just be the same
check to see if the page can be swapped out or discarded? Surely any page
that can be swapped out or discarded can be migrated. There might
theoretically be some pages that can't be swapped out or discarded that
could be migrated, but why not just ignore those cases?

DS

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