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MIGRATE_VMA_SELECT_COMPOUND will be used to select THP pages during migrate_vma_setup() and MIGRATE_PFN_COMPOUND will make migrating device pages as compound pages during device pfn migration. migrate_device code paths go through the collect, setup and finalize phases of migration. The entries in src and dst arrays passed to these functions still remain at a PAGE_SIZE granularity. When a compound page is passed, the first entry has the PFN along with MIGRATE_PFN_COMPOUND and other flags set (MIGRATE_PFN_MIGRATE, MIGRATE_PFN_VALID), the remaining entries (HPAGE_PMD_NR - 1) are filled with 0's. This representation allows for the compound page to be split into smaller page sizes. migrate_vma_collect_hole(), migrate_vma_collect_pmd() are now THP page aware. Two new helper functions migrate_vma_collect_huge_pmd() and migrate_vma_insert_huge_pmd_page() have been added. migrate_vma_collect_huge_pmd() can collect THP pages, but if for some reason this fails, there is fallback support to split the folio and migrate it. migrate_vma_insert_huge_pmd_page() closely follows the logic of migrate_vma_insert_page() Support for splitting pages as needed for migration will follow in later patches in this series. Link: https://lkml.kernel.org/r/20251001065707.920170-8-balbirs@nvidia.com Signed-off-by: Balbir Singh <balbirs@nvidia.com> Cc: David Hildenbrand <david@redhat.com> Cc: Zi Yan <ziy@nvidia.com> Cc: Joshua Hahn <joshua.hahnjy@gmail.com> Cc: Rakie Kim <rakie.kim@sk.com> Cc: Byungchul Park <byungchul@sk.com> Cc: Gregory Price <gourry@gourry.net> Cc: Ying Huang <ying.huang@linux.alibaba.com> Cc: Alistair Popple <apopple@nvidia.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Baolin Wang <baolin.wang@linux.alibaba.com> Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com> Cc: Nico Pache <npache@redhat.com> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Dev Jain <dev.jain@arm.com> Cc: Barry Song <baohua@kernel.org> Cc: Lyude Paul <lyude@redhat.com> Cc: Danilo Krummrich <dakr@kernel.org> Cc: David Airlie <airlied@gmail.com> Cc: Simona Vetter <simona@ffwll.ch> Cc: Ralph Campbell <rcampbell@nvidia.com> Cc: Mika Penttilä <mpenttil@redhat.com> Cc: Matthew Brost <matthew.brost@intel.com> Cc: Francois Dugast <francois.dugast@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.