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

[David Hildenbrand]

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@xxxxxxxxxxxxxx/
> >
> > Let me refloat this one :-)
>
> Kindly ping :-)

-EBUSY, will try having a look this week!

--
Thanks,

David / dhildenb