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

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Date:   Mon, 22 Feb 2021 12:15:10 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     David Hildenbrand <david@...hat.com>,
        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 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 :-)

 

-- 
Oscar Salvador
SUSE L3