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Support has also been > added for folios that might need to be split in the middle > of migration (when the src and dst do not agree on > MIGRATE_PFN_COMPOUND), that occurs when src side of the migration can > migrate large pages, but the destination has not been able to allocate > large pages. The code supported and used folio_split() when migrating > THP pages, this is used when MIGRATE_VMA_SELECT_COMPOUND is not passed > as an argument to migrate_vma_setup(). > > The test infrastructure lib/test_hmm.c has been enhanced to support THP > migration. A new ioctl to emulate failure of large page allocations has > been added to test the folio split code path. hmm-tests.c has new test > cases for huge page migration and to test the folio split path. A new > throughput test has been added as well. > > The nouveau dmem code has been enhanced to use the new THP migration > capability. > > Feedback from the RFC [2]: > > It was advised that prep_compound_page() not be exposed just for the purp= oses > of testing (test driver lib/test_hmm.c). Work arounds of copy and split t= he > folios did not work due to lock order dependency in the callback for > split folio. > > mTHP support: > > The patches hard code, HPAGE_PMD_NR in a few places, but the code has > been kept generic to support various order sizes. With additional > refactoring of the code support of different order sizes should be > possible. > > The future plan is to post enhancements to support mTHP with a rough > design as follows: > > 1. Add the notion of allowable thp orders to the HMM based test driver > 2. For non PMD based THP paths in migrate_device.c, check to see if > a suitable order is found and supported by the driver > 3. Iterate across orders to check the highest supported order for migrati= on > 4. Migrate and finalize > > The mTHP patches can be built on top of this series, the key design eleme= nts > that need to be worked out are infrastructure and driver support for mult= iple > ordered pages and their migration. > > References: > [1] https://lore.kernel.org/linux-mm/20201106005147.20113-1-rcampbell@nvi= dia.com/ > [2] https://lore.kernel.org/linux-mm/20250306044239.3874247-3-balbirs@nvi= dia.com/T/ > > These patches are built on top of mm-unstable > > Cc: Karol Herbst > Cc: Lyude Paul > Cc: Danilo Krummrich > Cc: David Airlie > Cc: Simona Vetter > Cc: "J=C3=A9r=C3=B4me Glisse" > Cc: Shuah Khan > Cc: David Hildenbrand > Cc: Barry Song > Cc: Baolin Wang > Cc: Ryan Roberts > Cc: Matthew Wilcox > Cc: Peter Xu > Cc: Zi Yan > Cc: Kefeng Wang > Cc: Jane Chu > Cc: Alistair Popple > Cc: Donet Tom > > Changelog v1: > - Changes from RFC [2], include support for handling fault_folio and usin= g > trylock in the fault path > - A new test case has been added to measure the throughput improvement > - General refactoring of code to keep up with the changes in mm > - New split folio callback when the entire split is complete/done. The > callback is used to know when the head order needs to be reset. > > Testing: > - Testing was done with ZONE_DEVICE private pages on an x86 VM > - Throughput showed upto 5x improvement with THP migration, system to dev= ice > migration is slower due to the mirroring of data (see buffer->mirror) > > Balbir Singh (12): > mm/zone_device: support large zone device private folios > mm/migrate_device: flags for selecting device private THP pages > mm/thp: zone_device awareness in THP handling code > mm/migrate_device: THP migration of zone device pages > mm/memory/fault: Add support for zone device THP fault handling > lib/test_hmm: test cases and support for zone device private THP > mm/memremap: Add folio_split support > mm/thp: add split during migration support > lib/test_hmm: add test case for split pages > selftests/mm/hmm-tests: new tests for zone device THP migration > gpu/drm/nouveau: Add THP migration support > selftests/mm/hmm-tests: New throughput tests including THP > > drivers/gpu/drm/nouveau/nouveau_dmem.c | 246 +++++--- > drivers/gpu/drm/nouveau/nouveau_svm.c | 6 +- > drivers/gpu/drm/nouveau/nouveau_svm.h | 3 +- > include/linux/huge_mm.h | 18 +- > include/linux/memremap.h | 29 +- > include/linux/migrate.h | 2 + > include/linux/mm.h | 1 + > lib/test_hmm.c | 428 ++++++++++--- > lib/test_hmm_uapi.h | 3 + > mm/huge_memory.c | 261 ++++++-- > mm/memory.c | 6 +- > mm/memremap.c | 50 +- > mm/migrate.c | 2 + > mm/migrate_device.c | 488 ++++++++++++--- > mm/page_alloc.c | 1 + > mm/page_vma_mapped.c | 10 + > mm/pgtable-generic.c | 6 + > mm/rmap.c | 19 +- > tools/testing/selftests/mm/hmm-tests.c | 805 ++++++++++++++++++++++++- > 19 files changed, 2072 insertions(+), 312 deletions(-) > I only got the cover letter. Did you forget to send the actual patches? Thanks. Best Regards, Yan, Zi