linux-kernel - Re: [PATCH 4/4] dax: "Hotplug" persistent memory for use like normal RAM

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Message-ID: <CAErSpo6ipXF1P=tHif_ezksD_ka54LYqsc1B11Ddfksm2hp6Jg@mail.gmail.com>
Date:   Wed, 16 Jan 2019 15:44:24 -0600
From:   Bjorn Helgaas <bhelgaas@...gle.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Dave Hansen <dave@...1.net>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Jiang <dave.jiang@...el.com>, zwisler@...nel.org,
        vishal.l.verma@...el.com, thomas.lendacky@....com,
        Andrew Morton <akpm@...ux-foundation.org>, mhocko@...e.com,
        linux-nvdimm@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm@...ck.org, Huang Ying <ying.huang@...el.com>,
        Wu Fengguang <fengguang.wu@...el.com>,
        Borislav Petkov <bp@...e.de>, baiyaowei@...s.chinamobile.com,
        Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH 4/4] dax: "Hotplug" persistent memory for use like normal RAM

On Wed, Jan 16, 2019 at 3:40 PM Dave Hansen <dave.hansen@...el.com> wrote:
> On 1/16/19 1:16 PM, Bjorn Helgaas wrote:
> > On Wed, Jan 16, 2019 at 12:25 PM Dave Hansen
> > <dave.hansen@...ux.intel.com> wrote:
> >> From: Dave Hansen <dave.hansen@...ux.intel.com>
> >> Currently, a persistent memory region is "owned" by a device driver,
> >> either the "Direct DAX" or "Filesystem DAX" drivers.  These drivers
> >> allow applications to explicitly use persistent memory, generally
> >> by being modified to use special, new libraries.
> >
> > Is there any documentation about exactly what persistent memory is?
> > In Documentation/, I see references to pstore and pmem, which sound
> > sort of similar, but maybe not quite the same?
>
> One instance of persistent memory is nonvolatile DIMMS.  They're
> described in great detail here: Documentation/nvdimm/nvdimm.txt

Thanks!  Some bread crumbs in the changelog to lead there would be great.

Bjorn