linux-kernel - Re: [PATCH 0/7] [RFC] hugetlb: pagetable

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Message-Id: <1172001297.18571.130.camel@localhost.localdomain>
Date:	Wed, 21 Feb 2007 06:54:57 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Adam Litke <agl@...ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] [RFC] hugetlb: pagetable_operations API

On Mon, 2007-02-19 at 19:43 +0100, Arjan van de Ven wrote:
> On Mon, 2007-02-19 at 10:31 -0800, Adam Litke wrote:
> > The page tables for hugetlb mappings are handled differently than page tables
> > for normal pages.  Rather than integrating multiple page size support into the
> > main VM (which would tremendously complicate the code) some hooks were created.
> > This allows hugetlb special cases to be handled "out of line" by a separate
> > interface.
> 
> ok it makes sense to clean this up.. what I don't like is that there
> STILL are all the double cases... for this to work and be worth it both
> the common case and the hugetlb case should be using the ops structure
> always! Anything else and you're just replacing bad code with bad
> code ;(

I don't fully agree. I think it makes sense to have the "special" case
be a function pointer and the "normal" case stay where it is for
performances. You don't want to pay the cost of the function pointer
call in the normal case do you ?

Ben.


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