linux-kernel - Re: [patch v3] x86: allow ZONE

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Message-ID: <alpine.DEB.2.00.1105031700380.26030@chino.kir.corp.google.com>
Date:	Tue, 3 May 2011 17:00:47 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch v3] x86: allow ZONE_DMA to be configurable

On Wed, 27 Apr 2011, David Rientjes wrote:

> ZONE_DMA is unnecessary for a large number of machines that do not
> require addressing in the lower 16MB of memory because they do not use
> devices with 16-bit address registers (plus one page byte register).
> 
> This patch allows users to disable ZONE_DMA for x86 if they know they
> will not be using such devices with their kernel.
> 
> This prevents the VM from unnecessarily reserving a ratio of memory
> (defaulting to 1/256th of system capacity) with lowmem_reserve_ratio
> for such allocations when it will never be used.
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Peter, is this ready for merge?
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