linux-kernel - Re: [PATCH -mm 3/6] Fix the x86-64 page colouring code to take pgoff into account and use that code as the basis for a generic page colouring code.

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Message-ID: <4FDF5B3C.1000007@redhat.com>
Date:	Mon, 18 Jun 2012 12:45:48 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	linux-mm@...ck.org, akpm@...ux-foundation.org, aarcange@...hat.com,
	peterz@...radead.org, minchan@...il.com, kosaki.motohiro@...il.com,
	hnaz@...xchg.org, mel@....ul.ie, linux-kernel@...r.kernel.org,
	Rik van Riel <riel@...riel.com>
Subject: Re: [PATCH -mm 3/6] Fix the x86-64 page colouring code to take pgoff
 into account and use that code as the basis for a generic page colouring
 code.

On 06/18/2012 12:30 PM, Andi Kleen wrote:
> Rik van Riel<riel@...hat.com>  writes:
>
>> From: Rik van Riel<riel@...riel.com>
>>
>> Teach the generic arch_get_unmapped_area(_topdown) code to call the
>> page colouring code.
>
> What tree is that against? I cannot find x86 page colouring code in next
> or mainline.

This is against mainline.

See align_addr in arch/x86/kernel/sys_x86_64.c and the
call sites in arch_get_unmapped_area(_topdown).

On certain AMD chips, Linux tries to get certain
allocations aligned to avoid cache aliasing issues.

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