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

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Message-ID: <20191203124240.GT20752@bombadil.infradead.org>
Date:   Tue, 3 Dec 2019 04:42:40 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Alastair D'Silva <alastair@....ibm.com>
Cc:     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>,
        Dan Williams <dan.j.williams@...el.com>,
        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@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-nvdimm@...ts.01.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 00/27] Add support for OpenCAPI SCM devices

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.