linux-kernel - Re: [PATCH -mm 4/7] mm: make page colouring code generic

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Message-Id: <20120619162747.fa31c86a.akpm@linux-foundation.org>
Date:	Tue, 19 Jun 2012 16:27:47 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-mm@...ck.org, aarcange@...hat.com, peterz@...radead.org,
	minchan@...il.com, kosaki.motohiro@...il.com, andi@...stfloor.org,
	hannes@...xchg.org, mel@....ul.ie, linux-kernel@...r.kernel.org,
	Rik van Riel <riel@...riel.com>
Subject: Re: [PATCH -mm 4/7] mm: make page colouring code generic

On Mon, 18 Jun 2012 18:05:23 -0400
Rik van Riel <riel@...hat.com> wrote:

> From: Rik van Riel <riel@...riel.com>
> 
> Fix the x86-64 page colouring code to take pgoff into account.

Could we please have a full description of what's wrong with the
current code?

> Use the x86 and MIPS page colouring code as the basis for a generic
> page colouring function.
> 
> Teach the generic arch_get_unmapped_area(_topdown) code to call the
> page colouring code.
> 
> Make sure that ALIGN_DOWN always aligns down, and ends up at the
> right page colour.

Some performance tests on the result would be interesting.  iirc, we've
often had trouble demonstrating much or any benefit from coloring.

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