[PATCH v1 0/3] udmabuf: Add support for page migration out of movable zone or CMA

[David Hildenbrand]

On 24.08.23 08:31, Kasireddy, Vivek wrote:
> Hi David,
> 
>>
>>>> - Add a new API to the backing store/allocator to longterm-pin the page.
>>>>     For example, something along the lines of
>> shmem_pin_mapping_page_longterm()
>>>>     for shmem as suggested by Daniel. A similar one needs to be added for
>>>>     hugetlbfs as well.
>>>
>>> This may also be reasonable.
>>
>> Sounds reasonable to keep the old API (that we unfortunately have) working.
> I agree; I'd like to avoid adding new APIs unless absolutely necessary. Given this,
> and considering the options I have mentioned earlier, what would be your
> recommendation for how page migration needs to be done in udmabuf driver?

I guess using proper APIs for shmem and hugetlb. So, turning roughly 
what you have in patch#1 for now into common code, and only calling into 
that from udmabug.

-- 
Cheers,

David / dhildenb