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

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Message-ID: <20070204165407.GD10477@curandero.marconia.cz>
Date:	Sun, 4 Feb 2007 17:54:08 +0100
From:	Michal Hocko <mstsxfx@...il.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: mm: how to check for kernel pages

On Sun, Feb 04, 2007 at 04:45:51PM +0100, Arjan van de Ven wrote:
> > Sorry for not being more precise. As a part of my thesis work I need to
> > migrate pages. I greatly use mm/migrate.c code.  
> > I assume that not all pages can be migrated - especially those used by
> > kernel (where direct virtual to physical mapping is used).
> > So I intended something like following code:
> 
> it's more than that... even userspace pages may not be moved if they're
> the target of active DMA for example ..... 

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

-- 
Michal Hocko

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