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Date: Wed, 19 Aug 2015 17:49:54 -0700
Message-ID: <CAPcyv4gLVLWcyS5FWHgm37d7PDwzA03VStomgt37cevfDv7ojQ@mail.gmail.com>
Subject: Re: [RFC PATCH 1/7] x86, mm: ZONE_DEVICE for "device memory"
From: Dan Williams <dan.j.williams@intel.com>
To: Jerome Glisse <j.glisse@gmail.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Boaz Harrosh <boaz@plexistor.com>, Rik van Riel <riel@redhat.com>,
        "linux-nvdimm@lists.01.org" <linux-nvdimm@ml01.01.org>,
        Dave Hansen <dave.hansen@linux.intel.com>, david <david@fromorbit.com>,
        Ingo Molnar <mingo@kernel.org>, Linux MM <linux-mm@kvack.org>,
        Ingo Molnar <mingo@redhat.com>, Mel Gorman <mgorman@suse.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Ross Zwisler <ross.zwisler@linux.intel.com>,
        "torvalds@linux-foundation.org" <torvalds@linux-foundation.org>,
        Christoph Hellwig <hch@lst.de>
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On Tue, Aug 18, 2015 at 12:06 PM, Jerome Glisse <j.glisse@gmail.com> wrote:
> On Tue, Aug 18, 2015 at 10:23:38AM -0700, Dan Williams wrote:
> Thought maybe you don't need a new ZONE_DEV and all you need is valid
> struct page for this device memory, and you don't want this page to be
> useable by the general memory allocator. There is surely other ways to
> achieve that like marking all as reserved when you hotplug them.
>

Yes, there are other ways that can achieve the same thing, but I do
like the ability to do reverse page to zone lookups for debug if
anything.
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