linux-kernel - Re: bugs in page colouring code

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Message-ID: <4FDA55A6.2030706@redhat.com>
Date:	Thu, 14 Jun 2012 17:20:38 -0400
From:	Rik van Riel <riel@...hat.com>
To:	"H. Peter Anvin" <hpa@...ux.intel.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 05:13 PM, H. Peter Anvin wrote:

> 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.

Agreed, it is hard to imagine a program that passes
address 0 to mmap, yet breaks when it gets a coloured
page address back...

I'll leave that bit of code untouched for now, we can
play with it later.
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