Re: mm: how to check for kernel pages

[Arjan van de Ven <arjan@infradead.org>]

On Sun, 2007-02-04 at 16:33 +0100, Michal Hocko wrote:
> On Sun, Feb 04, 2007 at 02:57:30PM +0100, Arjan van de Ven wrote:
> > On Sun, 2007-02-04 at 12:02 +0100, Michal Hocko wrote:
> > > Hi,
> > > is there any effective and fast way how to find out whether page
> > > given by its page frame number is currenly used by (mapped by) kernel?
> > 
> > what do you want to use this for? The answer to your question greatly
> > depends on that...
> 
> 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 ..... 
-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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