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

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Message-ID: <alpine.DEB.2.00.1010150209550.8103@chino.kir.corp.google.com>
Date:	Fri, 15 Oct 2010 02:11:37 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.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 Fri, 15 Oct 2010, Ingo Molnar wrote:

> Can we automate it perhaps? Drivers could express their zone needs, and 
> perhaps we can free up the zone if there's no relevant driver loaded by 
> the time we have booted up? If a hotplug driver arrives later on, is the 
> MM good enough for us to be able to reinstate the zone dynamically?
> 

That's the same as setting /proc/sys/vm/lowmem_reserve_ratio to 0 for all 
zones so that no lowmem is reserved specifically for DMA allocations.  
Then, ZONE_DMA becomes like any other zone and is open to all allocations.
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