linux-kernel - Re: remap allocator for per-CPU memory

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Message-ID: <4A0AAB6B.3090903@novell.com>
Date:	Wed, 13 May 2009 20:13:47 +0900
From:	Tejun Heo <teheo@...ell.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Jan Beulich <JBeulich@...ell.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: remap allocator for per-CPU memory

Andi Kleen wrote:
> Tejun Heo <teheo@...ell.com> writes:
>> Okay, just glanced over the pageattr code.  I don't think we need any
>> special provisions for this as long as the TLB is fine with having
>> overlapping PMD and PTE mappings with different attributes (please
>> note that these two mappings aren't occupying the same linear
>> addresses - they're aliases).  This is allowed, right?
> 
> Nope.

Yeah, I'm going through the manual now and can't find anything which
allows such behavior.  I haven't been able to find anything which
describes what happens between large page and 4k page aliases.
Aieee...  I'll dig through the manual a bit more and see whether this
can be worked around somehow.  :-(

Thanks.

-- 
tejun
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