linux-kernel - Re: [PATCH 00/21] mm: introduce Designated Movable Blocks

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Date:   Wed, 14 Sep 2022 08:21:25 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Doug Berger <opendmb@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Mike Rapoport <rppt@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Borislav Petkov <bp@...e.de>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Hildenbrand <david@...hat.com>, Zi Yan <ziy@...dia.com>,
        Oscar Salvador <osalvador@...e.de>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Kees Cook <keescook@...omium.org>,
        - <devicetree-spec@...r.kernel.org>,
        KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
        Mel Gorman <mgorman@...e.de>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-mm <linux-mm@...ck.org>,
        iommu@...ts.linux.dev
Subject: Re: [PATCH 00/21] mm: introduce Designated Movable Blocks

On Tue, Sep 13, 2022 at 2:57 PM Doug Berger <opendmb@...il.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