linux-kernel - Re: [PATCH] mm: MADV_WILLNEED implementation for anonymous memory

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Message-ID: <20080131110610.GA31090@one.firstfloor.org>
Date:	Thu, 31 Jan 2008 12:06:10 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, hugh@...itas.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, npiggin@...e.de,
	riel@...hat.com, mztabzr@...inter.de, mpm@...enic.com
Subject: Re: [PATCH] mm: MADV_WILLNEED implementation for anonymous memory

> Yeah, the 2.5 switch to physical scanning killed us there.
> 
> I still don't know why my allocate-swapspace-according-to-virtual-address
> change didn't help.  Much.  Marcelo played with that a bit too.

I've been thinking about just always doing swap on > page clusters. 
Any reason swapping couldn't be done on e.g. 1MB chunks? 

-Andi
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