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

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To: Jason Gunthorpe <jgg@xxxxxxxxxx>, "Kasireddy, Vivek" <vivek.kasireddy@xxxxxxxxx>
Subject: Re: [PATCH v1 0/3] udmabuf: Add support for page migration out of movable zone or CMA
From: David Hildenbrand <david@xxxxxxxxxx>
Date: Wed, 23 Aug 2023 11:34:33 +0200
Cc: "dri-devel@xxxxxxxxxxxxxxxxxxxxx" <dri-devel@xxxxxxxxxxxxxxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, Daniel Vetter <daniel.vetter@xxxxxxxx>, Mike Kravetz <mike.kravetz@xxxxxxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, Gerd Hoffmann <kraxel@xxxxxxxxxx>, "Kim, Dongwon" <dongwon.kim@xxxxxxxxx>, "Chang, Junxiao" <junxiao.chang@xxxxxxxxx>
In-reply-to: <ZOSo2cuw1ashK3+Z@nvidia.com>
Organization: Red Hat
References: <20230817064934.3424431-1-vivek.kasireddy@intel.com> <ZN42XjuXUyma5uE+@nvidia.com> <IA0PR11MB7185ABFBB06771B7646F8F50F81FA@IA0PR11MB7185.namprd11.prod.outlook.com> <ZOSo2cuw1ashK3+Z@nvidia.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0

- 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.

--
Cheers,

David / dhildenb

Follow-Ups:
- RE: [PATCH v1 0/3] udmabuf: Add support for page migration out of movable zone or CMA
  - From: Kasireddy, Vivek

References:
- [PATCH v1 0/3] udmabuf: Add support for page migration out of movable zone or CMA
  - From: Vivek Kasireddy
- Re: [PATCH v1 0/3] udmabuf: Add support for page migration out of movable zone or CMA
  - From: Jason Gunthorpe
- RE: [PATCH v1 0/3] udmabuf: Add support for page migration out of movable zone or CMA
  - From: Kasireddy, Vivek
- Re: [PATCH v1 0/3] udmabuf: Add support for page migration out of movable zone or CMA
  - From: Jason Gunthorpe

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