linux-kernel - Re: [PATCH v2 0/7] Allocate memmap from hotadded memory (per device)

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Date:   Mon, 22 Feb 2021 12:28:22 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Michal Hocko <mhocko@...nel.org>, VlastimilBabkavbabka@...e.cz,
        pasha.tatashin@...een.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Anshuman Khandual <anshuman.khandual@....com>
Subject: Re: [PATCH v2 0/7] Allocate memmap from hotadded memory (per device)

On 22.02.21 12:15, Oscar Salvador wrote:
> On Wed, Feb 17, 2021 at 11:18:59AM +0100, Oscar Salvador wrote:
>> On Tue, Feb 09, 2021 at 02:38:47PM +0100, Oscar Salvador wrote:
>>> Hi,
>>>
>>> here is v2.
>>>
>>> Changes from v1 -> v2
>>>   - Addressed feedback from David
>>>   - Fence off the feature in case struct page size is not
>>>     multiple of PMD size or pageblock alignment cannot be guaranted
>>>   - Tested on x86_64 small and large memory_blocks
>>>   - Tested on arm64 4KB and 64KB page sizes (for some reason I cannot boot
>>>     my VM with 16KB page size).
>>>
>>>   Arm64 with 4KB page size behaves like x86_64 after [1], which made section
>>>   size smaller.
>>>   With 64KB, the feature gets fenced off due to pageblock alignment.
>>>
>>> Changes from RFCv3 -> v1:
>>>   - Addressed feedback from David
>>>   - Re-order patches
>>>
>>> Changes from v2 -> v3 (RFC):
>>>   - Re-order patches (Michal)
>>>   - Fold "mm,memory_hotplug: Introduce MHP_MEMMAP_ON_MEMORY" in patch#1
>>>   - Add kernel boot option to enable this feature (Michal)
>>>
>>> Changes from v1 -> v2 (RFC):
>>>   - Addressed feedback provided by David
>>>   - Add a arch_support_memmap_on_memory to be called
>>>     from mhp_supports_memmap_on_memory, as atm,
>>>     only ARM, powerpc and x86_64 have altmat support.
>>>
>>> [1] https://lore.kernel.org/lkml/cover.1611206601.git.sudaraja@codeaurora.org/
>>
>> Let me refloat this one :-)
> 
> Kindly ping :-)

-EBUSY, will try having a look this week!

-- 
Thanks,

David / dhildenb