linux-kernel - Re: [PATCH 5/9] mm: Let sparse_{add,remove}_one_section receive a node

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Date:	Tue, 09 Sep 2014 11:36:42 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Boaz Harrosh <boaz@...xistor.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Jens Axboe <axboe@...com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-nvdimm@...ts.01.org, Toshi Kani <toshi.kani@...com>,
	linux-mm@...ck.org
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/9] mm: Let sparse_{add,remove}_one_section receive a
 node_id

On 09/09/2014 08:45 AM, Boaz Harrosh wrote:
> This is for add_persistent_memory that will want a section of pages
> allocated but without any zone associated. This is because belonging
> to a zone will give the memory to the page allocators, but
> persistent_memory belongs to a block device, and is not available for
> regular volatile usage.

I don't think we should be taking patches like this in to the kernel
until we've seen the other side of it.  Where is the page allocator code
which will see a page belonging to no zone?  Am I missing it in this set?

I see about 80 or so calls to page_zone() in the kernel.  How will a
zone-less page look to all of these sites?
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