From: Dan Williams <dan.j.williams@intel.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-arm-kernel@lists.infradead.org,
Linux MM <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Michal Hocko <mhocko@suse.com>,
Mel Gorman <mgorman@techsingularity.net>,
james.morse@arm.com, Mark Rutland <mark.rutland@arm.com>,
Robin Murphy <robin.murphy@arm.com>,
cpandya@codeaurora.org, arunks@codeaurora.org, osalvador@suse.de,
Logan Gunthorpe <logang@deltatee.com>,
Pavel Tatashin <pasha.tatashin@oracle.com>,
David Hildenbrand <david@redhat.com>,
cai@lca.pw
Subject: Re: [PATCH 0/6] arm64/mm: Enable memory hot remove and ZONE_DEVICE
Date: Wed, 3 Apr 2019 11:08:53 -0700 [thread overview]
Message-ID: <CAPcyv4gdz7L20nSMEBNLDWgUzr-GjaBhecF3i8Q4D_O=ug0qNw@mail.gmail.com> (raw)
In-Reply-To: <1554265806-11501-1-git-send-email-anshuman.khandual@arm.com>
On Tue, Apr 2, 2019 at 9:30 PM Anshuman Khandual
<anshuman.khandual@arm.com> wrote:
>
> This series enables memory hot remove on arm64, fixes a memblock removal
> ordering problem in generic __remove_memory(), enables sysfs memory probe
> interface on arm64. It also enables ZONE_DEVICE with struct vmem_altmap
> support.
>
> Testing:
>
> Tested hot remove on arm64 for all 4K, 16K, 64K page config options with
> all possible VA_BITS and PGTABLE_LEVELS combinations. Tested ZONE_DEVICE
> with ARM64_4K_PAGES through a dummy driver.
>
> Build tested on non arm64 platforms. I will appreciate if folks can test
> arch_remove_memory() re-ordering in __remove_memory() on other platforms.
>
> Dependency:
>
> V5 series in the thread (https://lkml.org/lkml/2019/2/14/1096) will make
> kernel linear mapping loose pgtable_page_ctor() init. When this happens
> the proposed functions free_pte|pmd|pud_table() in [PATCH 2/6] will have
> to stop calling pgtable_page_dtor().
Hi Anshuman,
I'd be interested to integrate this with the sub-section hotplug
support [1]. Otherwise the padding implementation in libnvdimm can't
be removed unless all ZONE_DEVICE capable archs also agree on the
minimum arch_add_memory() granularity. I'd prefer not to special case
which archs support which granularity, but it unfortunately
complicates what you're trying to achieve.
I think at a minimum we, mm hotplug co-travellers, need to come to a
consensus on whether sub-section support is viable for v5.2 and / or a
pre-requisite for new arch-ZONE_DEVICE implementations.
next prev parent reply other threads:[~2019-04-03 18:09 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-03 4:30 [PATCH 0/6] arm64/mm: Enable memory hot remove and ZONE_DEVICE Anshuman Khandual
2019-04-03 4:30 ` [PATCH 1/6] arm64/mm: Enable sysfs based memory hot add interface Anshuman Khandual
2019-04-03 8:20 ` David Hildenbrand
2019-04-03 13:12 ` Robin Murphy
2019-04-04 5:21 ` Anshuman Khandual
2019-04-04 5:25 ` Anshuman Khandual
2019-04-04 8:49 ` David Hildenbrand
2019-04-03 4:30 ` [PATCH 2/6] arm64/mm: Enable memory hot remove Anshuman Khandual
2019-04-03 12:37 ` Robin Murphy
2019-04-03 13:15 ` Steven Price
2019-04-04 6:51 ` Anshuman Khandual
2019-04-04 5:39 ` Anshuman Khandual
2019-04-04 11:58 ` Oscar Salvador
2019-04-04 13:03 ` Anshuman Khandual
2019-04-04 15:19 ` Oscar Salvador
2019-04-03 17:32 ` Logan Gunthorpe
2019-04-03 17:57 ` Robin Murphy
2019-04-04 8:23 ` Anshuman Khandual
2019-04-04 7:07 ` Anshuman Khandual
2019-04-04 9:16 ` Steven Price
2019-04-03 4:30 ` [PATCH 3/6] arm64/mm: Enable struct page allocation from device memory Anshuman Khandual
2019-04-03 4:30 ` [PATCH 4/6] mm/hotplug: Reorder arch_remove_memory() call in __remove_memory() Anshuman Khandual
2019-04-03 8:45 ` Oscar Salvador
2019-04-03 9:17 ` Michal Hocko
2019-04-04 8:32 ` Anshuman Khandual
2019-04-03 9:30 ` David Hildenbrand
2019-04-03 4:30 ` [PATCH 5/6] mm/memremap: Rename and consolidate SECTION_SIZE Anshuman Khandual
2019-04-03 9:26 ` Michal Hocko
2019-04-03 9:30 ` David Hildenbrand
2019-04-03 4:30 ` [PATCH 6/6] arm64/mm: Enable ZONE_DEVICE Anshuman Khandual
2019-04-03 13:58 ` Robin Murphy
2019-04-03 16:07 ` Jerome Glisse
2019-04-04 5:03 ` Anshuman Khandual
2019-04-04 4:42 ` Anshuman Khandual
2019-04-04 5:04 ` Dan Williams
2019-04-04 9:46 ` Robin Murphy
2019-04-07 22:11 ` Dan Williams
2019-04-08 4:03 ` Ira Weiny
2019-04-08 6:03 ` Anshuman Khandual
2019-04-03 18:08 ` Dan Williams [this message]
2019-04-04 13:11 ` [PATCH 0/6] arm64/mm: Enable memory hot remove and ZONE_DEVICE Anshuman Khandual
2019-04-04 9:46 ` [RFC 1/2] mm/vmemmap: Enable vmem_altmap based base page mapping for vmemmap Anshuman Khandual
2019-04-04 9:46 ` [RFC 2/2] arm64/mm: Enable ZONE_DEVICE for all page configs Anshuman Khandual
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