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From: "David Schwartz" <davids@webmaster.com>
To: "Arjan van de Ven" <arjan@infradead.org>
Cc: <linux-kernel@vger.kernel.org>
Subject: RE: mm: how to check for kernel pages
Date: Sun, 4 Feb 2007 09:49:55 -0800	[thread overview]
Message-ID: <MDEHLPKNGKAHNMBLJOLKMENMBFAC.davids@webmaster.com> (raw)
In-Reply-To: <20070204165407.GD10477@curandero.marconia.cz>


> 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



      reply	other threads:[~2007-02-04 17:50 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-04 11:02 Michal Hocko
2007-02-04 13:57 ` Arjan van de Ven
2007-02-04 15:33   ` Michal Hocko
2007-02-04 15:45     ` Arjan van de Ven
2007-02-04 16:54       ` Michal Hocko
2007-02-04 17:49         ` David Schwartz [this message]

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