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

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Message-Id: <1172001460.18571.134.camel@localhost.localdomain>
Date:	Wed, 21 Feb 2007 06:57:40 +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

> maybe. I'm not entirely convinced... (I like the cleanup potential a lot
> code wise.. but if it costs performance, then... well I'd hate to see
> linux get slower for hugetlbfs)
> 
> > If not, then I definitely wouldn't
> > mind creating a default_pagetable_ops and calling into that.
> 
> ... but without it to be honest, your patch adds nothing real.. there's
> ONE user of your code, and there's no real cleanup unless you get rid of
> all the special casing.... since the special casing is the really ugly
> part of hugetlbfs, not the actual code inside the special case..

Well... I disagree there too :-)

I've been working recently for example on some spufs improvements that
require similar tweaking of the user address space as hugetlbfs. The
problem I have is that while there are hooks in the generic code pretty
much everywhere I need.... they are all hugetlb specific, that is they
call directly into the hugetlb code.

For now, I found ways of doing my stuff without hooking all over the
page table operations (well, I had no real choices) but I can imagine it
making sense to allow something (hugetlb being one of them) to take over
part of the user address space.

Ben.

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