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

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Message-ID: <20190604074056.GA2853@linux>
Date:   Tue, 4 Jun 2019 09:41:00 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     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>,
        Jeff Moyer <jmoyer@...hat.com>, Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>, stable@...r.kernel.org,
        Jérôme Glisse <jglisse@...hat.com>,
        linux-nvdimm@...ts.01.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 00/12] mm: Sub-section memory hotplug support

On Mon, May 06, 2019 at 04:39:26PM -0700, Dan Williams wrote:
> Changes since v7 [1]:
> 
> - Make subsection helpers pfn based rather than physical-address based
>   (Oscar and Pavel)
> 
> - Make subsection bitmap definition scalable for different section and
>   sub-section sizes across architectures. As a result:
> 
>       unsigned long map_active
> 
>   ...is converted to:
> 
>       DECLARE_BITMAP(subsection_map, SUBSECTIONS_PER_SECTION)
> 
>   ...and the helpers are renamed with a 'subsection' prefix. (Pavel)
> 
> - New in this version is a touch of arch/powerpc/include/asm/sparsemem.h
>   in "[PATCH v8 01/12] mm/sparsemem: Introduce struct mem_section_usage"
>   to define ARCH_SUBSECTION_SHIFT.
> 
> - Drop "mm/sparsemem: Introduce common definitions for the size and mask
>   of a section" in favor of Robin's "mm/memremap: Rename and consolidate
>   SECTION_SIZE" (Pavel)
> 
> - Collect some more Reviewed-by tags. Patches that still lack review
>   tags: 1, 3, 9 - 12

Hi Dan,

are you planning to send V10 anytime soon?

After you addressed comments from Patch#9, the general implementation looks
fine to me and nothing sticked out from the other patches.
But I would rather wait to see v10 with the comments addressed before stamping
my Reviewed-by.

I am planning to fire my vmemmap patchset again [1], and I would like to re-base
it on top of this work, otherwise we will face many unnecessary collisions.

Thanks

[1] https://patchwork.kernel.org/patch/10875025/

-- 
Oscar Salvador
SUSE L3