linux-kernel - Re: [PATCH v2 00/27] Add support for OpenCAPI SCM devices

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Message-ID: <CAPcyv4hccpaw5fFdp7u3Z=C0zNZ1oTBtNfyLhJ16C2Dmq+Qp3Q@mail.gmail.com>
Date:   Tue, 3 Dec 2019 16:15:08 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     "Alastair D'Silva" <alastair@....ibm.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>,
        Keith Busch <keith.busch@...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 v2 00/27] Add support for OpenCAPI SCM devices

On Tue, Dec 3, 2019 at 4:43 AM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Tue, Dec 03, 2019 at 03:01:17PM +1100, Alastair D'Silva wrote:
> > On Mon, 2019-12-02 at 19:50 -0800, Matthew Wilcox wrote:
> > > On Tue, Dec 03, 2019 at 02:46:28PM +1100, Alastair D'Silva wrote:
> > > > This series adds support for OpenCAPI SCM devices, exposing
> > >
> > > Could we _not_ introduce yet another term for persistent memory?
> > >
> >
> > "Storage Class Memory" is an industry wide term, and is used repeatedly
> > in the device specifications. It's not something that has been pulled
> > out of thin air.
>
> "Somebody else also wrote down Storage Class Memory".  Don't care.
> Google gets 750k hits for Persistent Memory and 150k hits for
> Storage Class Memory.  This term lost.
>
> > The term is also already in use within the 'papr_scm' driver.
>
> The acronym "SCM" is already in use.  Socket Control Messages go back
> to early Unix (SCM_RIGHTS, SCM_CREDENTIALS, etc).  Really, you're just
> making the case that IBM already uses the term SCM.  You should stop.

I tend to agree. The naming of things under
arch/powerpc/platforms/pseries/ is not under my purview, but
drivers/nvdimm/ is. Since this driver is colocated with the "pmem"
driver let's not proliferate the "scm" vs "pmem" confusion.