linux-kernel - Re: [PATCH v8 00/12] mm: Sub-section memory hotplug support

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Message-ID: <CAPcyv4he64-d=govm4+OEt75gxeuLZcrwrhow5dT=rA3KwQ4JA@mail.gmail.com>
Date:   Mon, 13 May 2019 14:11:54 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Jane Chu <jane.chu@...cle.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Robin Murphy <robin.murphy@....com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Paul Mackerras <paulus@...ba.org>,
        Toshi Kani <toshi.kani@....com>,
        Oscar Salvador <osalvador@...e.de>,
        Jeff Moyer <jmoyer@...hat.com>, Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        stable <stable@...r.kernel.org>,
        Jérôme Glisse <jglisse@...hat.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 00/12] mm: Sub-section memory hotplug support

On Mon, May 13, 2019 at 2:02 PM Mike Rapoport <rppt@...ux.ibm.com> wrote:
>
> Hi Dan,
>
> On Mon, May 06, 2019 at 04:39:26PM -0700, Dan Williams wrote:
> > Changes since v7 [1]:
>
> Sorry for jumping late

No worries, it needs to be rebased on David's "mm/memory_hotplug:
Factor out memory block device handling" series which puts it firmly
in v5.3 territory.

> but presuming there will be v9, it'd be great if it
> would also include include updates to
> Documentation/admin-guide/mm/memory-hotplug.rst and

If I've done my job right this series should be irrelevant to
Documentation/admin-guide/mm/memory-hotplug.rst. The subsection
capability is strictly limited to arch_add_memory() users that never
online the memory, i.e. only ZONE_DEVICE / devm_memremap_pages()
users. So this isn't "memory-hotplug" as much as it is "support for
subsection vmemmap management".

> Documentation/vm/memory-model.rst

This looks more fitting and should probably include a paragraph on the
general ZONE_DEVICE / devm_memremap_pages() use case.