linux-kernel - Re: [PATCH v3 00/27] Add support for OpenCAPI Persistent Memory devices

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Date:   Fri, 21 Feb 2020 08:24:18 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     "Alastair D'Silva" <alastair@....ibm.com>
Cc:     alastair@...ilva.org,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>,
        Anton Blanchard <anton@...abs.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Cédric Le Goater <clg@...d.org>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kurz <groug@...d.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH v3 00/27] Add support for OpenCAPI Persistent Memory devices

On Fri, Feb 21, 2020 at 8:21 AM Dan Williams <dan.j.williams@...el.com> wrote:
>
> On Thu, Feb 20, 2020 at 7:28 PM Alastair D'Silva <alastair@....ibm.com> wrote:
> >
> > From: Alastair D'Silva <alastair@...ilva.org>
> >
> > This series adds support for OpenCAPI Persistent Memory devices, exposing
> > them as nvdimms so that we can make use of the existing infrastructure.
>
> A single sentence to introduce:
>
> 24 files changed, 3029 insertions(+), 97 deletions(-)
>
> ...is inadequate. What are OpenCAPI Persistent Memory devices? How do
> they compare, in terms relevant to libnvdimm, to other persistent
> memory devices? What challenges do they pose to the existing enabling?
> What is the overall approach taken with this 27 patch break down? What
> are the changes since v2, v1? If you incorporated someone's review
> feedback note it in the cover letter changelog, if you didn't

Assumptions and tradeoffs the implementation considered are also
critical for reviewing the approach.