linux-kernel - Re: [patch] x86: allow ZONE

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Date:	Wed, 13 Oct 2010 17:44:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Casey Dahlin <cdahlin@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] x86: allow ZONE_DMA to be configurable

On 10/13/2010 05:42 PM, David Rientjes wrote:
> You can already set the lowmem_reserve_ratio via 
> /proc/sys/vm/lowmem_reserve_ratio.

And why is it then so hard to put in a single line in /etc/sysctl.conf
for you?

> We've run without ZONE_DMA for a couple years because we don't have such 
> hardware limitations and would appreciate the ability to disable it with a 
> config option rather than hacking the kernel to get it to compile.  I'm 
> sure Casey would as well as you can see in the thread "A question about 
> ZONE_DMA".
> 
> I don't see the harm in being able to conveniently disable the zone if you 
> know what you're doing.

There are going to be a lot of very strange bug reports as a result.

	-hpa
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