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From:   Rob Herring <robh+dt@kernel.org>
Date:   Wed, 14 Sep 2022 08:21:25 -0500
Message-ID: <CAL_JsqLmJcLHViPaBPvkBhR4xi+ZQuAJQpXoiJLVRW9EH4EX0Q@mail.gmail.com>
Subject: Re: [PATCH 00/21] mm: introduce Designated Movable Blocks
To:     Doug Berger <opendmb@gmail.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Frank Rowand <frowand.list@gmail.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Muchun Song <songmuchun@bytedance.com>,
        Mike Rapoport <rppt@kernel.org>,
        Christoph Hellwig <hch@lst.de>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Borislav Petkov <bp@suse.de>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Neeraj Upadhyay <quic_neeraju@quicinc.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Damien Le Moal <damien.lemoal@opensource.wdc.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        David Hildenbrand <david@redhat.com>, Zi Yan <ziy@nvidia.com>,
        Oscar Salvador <osalvador@suse.de>,
        Hari Bathini <hbathini@linux.ibm.com>,
        Kees Cook <keescook@chromium.org>,
        - <devicetree-spec@vger.kernel.org>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Mel Gorman <mgorman@suse.de>,
        Linux Doc Mailing List <linux-doc@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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        iommu@lists.linux.dev
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On Tue, Sep 13, 2022 at 2:57 PM Doug Berger <opendmb@gmail.com> wrote:
>
> MOTIVATION:
> Some Broadcom devices (e.g. 7445, 7278) contain multiple memory
> controllers with each mapped in a different address range within
> a Uniform Memory Architecture. Some users of these systems have
> expressed the desire to locate ZONE_MOVABLE memory on each
> memory controller to allow user space intensive processing to
> make better use of the additional memory bandwidth.
> Unfortunately, the historical monotonic layout of zones would
> mean that if the lowest addressed memory controller contains
> ZONE_MOVABLE memory then all of the memory available from
> memory controllers at higher addresses must also be in the
> ZONE_MOVABLE zone. This would force all kernel memory accesses
> onto the lowest addressed memory controller and significantly
> reduce the amount of memory available for non-movable
> allocations.

Why are you sending kernel patches to the Devicetree specification list?

Rob