linux-kernel - Re: [PATCH] drivers/base/node.c: export physical address range of given node (Re: NUMA node information for pages)

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Message-ID: <alpine.DEB.2.02.1404111513040.17724@chino.kir.corp.google.com>
Date:	Fri, 11 Apr 2014 15:13:56 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Hansen <dave.hansen@...el.com>
cc:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>, drepper@...il.com,
	anatol.pomozov@...il.com, jkosina@...e.cz,
	akpm@...ux-foundation.org, xemul@...allels.com,
	paul.gortmaker@...driver.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] drivers/base/node.c: export physical address range of
 given node (Re: NUMA node information for pages)

On Fri, 11 Apr 2014, Dave Hansen wrote:

> > So?  Who cares if there are non-addressable holes in part of the span?  
> > Ulrich, correct me if I'm wrong, but it seems you're looking for just a 
> > address-to-nodeid mapping (or pfn-to-nodeid mapping) and aren't actually 
> > expecting that there are no holes in a node for things like acpi or I/O or 
> > reserved memory.
> ...
> > I think trying to represent holes and handling different memory models and 
> > hotplug in special ways is complete overkill.
> 
> This isn't just about memory hotplug or different memory models.  There
> are systems out there today, in production, that have layouts like this:
> 
> |------Node0-----|
>      |------Node1-----|
> 
> and this:
> 
> |------Node0-----|
>      |-Node1-|
> 

What additional information, in your opinion, can we export to assist 
userspace in making this determination that $address is on $nid?
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