linux-kernel - Re: [13/14] vcompound: Use vcompound for swap

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Date:	Tue, 25 Mar 2008 18:55:08 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [13/14] vcompound: Use vcompound for swap_map

On Tue, Mar 25, 2008 at 10:45:06AM -0700, Christoph Lameter wrote:
> On Tue, 25 Mar 2008, Andi Kleen wrote:
> 
> > I liked your idea of fixing compound pages to not rely on order
> > better. Ok it is likely more work to implement @)
> 
> Right. It just requires a page allocator rewrite. 

Not when the trick of getting high order, returning left over pages
is used. I meant just updating the GFP_COMPOUND code to always
use number of pages instead of order so that it could deal with a compound
where the excess pages are already returned. That is not actually that 
much work (I reimplemented this recently for dma alloc and it's < 20 LOC) 

Of course the full rewrite would be also great, agreed :)

-Andi
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