linux-kernel - Re: bugs in page colouring code

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Message-ID: <4FDA5413.9080400@linux.intel.com>
Date:	Thu, 14 Jun 2012 14:13:55 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Rik van Riel <riel@...hat.com>
CC:	Borislav Petkov <bp@...64.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	sjhill@...s.com, ralf@...ux-mips.org,
	Rob Herring <rob.herring@...xeda.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Nicolas Pitre <nico@...aro.org>
Subject: Re: bugs in page colouring code

On 06/14/2012 02:03 PM, Rik van Riel wrote:
> On 06/14/2012 04:58 PM, H. Peter Anvin wrote:
>> On 06/14/2012 05:57 AM, Rik van Riel wrote:
>>>
>>> However, I expect that on x86 many applications expect
>>> MAP_FIXED to just work, and enforcing that would be
>>> more trouble than it's worth.
>>>
>>
>> MAP_FIXED, is well, fixed.  It means that performance be screwed, if we
>> can fulfill the request we MUST do so.
> 
> My codebase now has a separate arch_align_addr function
> for x86, which is surprisingly similar to the generic
> one :)

I am much more skeptical to disabling page coloring in the !PF_RANDOMIZE
case when no address hint is proposed.  I would like to at least try
running without it, perhaps with a chicken bit in a sysctl.

	-hpa

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