From: Zi Yan <[email protected]> Hi all,
THP migration is only enabled on x86_64 with a special ARCH_ENABLE_THP_MIGRATION macro. This patchset enables THP migration for all architectures that uses transparent hugepage, so that special macro can be dropped. Instead, THP migration is enabled/disabled via /sys/kernel/mm/transparent_hugepage/enable_thp_migration. I grepped for TRANSPARENT_HUGEPAGE in arch folder and got 9 architectures that are supporting transparent hugepage. I mechanically add __pmd_to_swp_entry() and __swp_entry_to_pmd() based on existing __pte_to_swp_entry() and __swp_entry_to_pte() for all these architectures, except tile which is going to be dropped. I have successfully compiled all these architectures, but have NOT tested them due to lack of real hardware. I appreciate your help, if the maintainers of these architectures can do a quick test with the code from https://github.com/x-y-z/thp-migration-bench . Please apply patch 9 as well to enable THP migration. By enabling THP migration, migrating a 2MB THP on x86_64 machines takes only 1/3 time of migrating equivalent 512 4KB pages. Hi Naoya, I also add soft dirty support for powerpc and s390. It would be great if you can take a look at patch 6 & 7. Feel free to give comments. Thanks. Cc: [email protected] Cc: Vineet Gupta <[email protected]> Cc: [email protected] Cc: Russell King <[email protected]> Cc: Christoffer Dall <[email protected]> Cc: Marc Zyngier <[email protected]> Cc: [email protected] Cc: Catalin Marinas <[email protected]> Cc: Will Deacon <[email protected]> Cc: Steve Capper <[email protected]> Cc: Kristina Martsenko <[email protected]> Cc: Dan Williams <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Cc: [email protected] Cc: Ralf Baechle <[email protected]> Cc: James Hogan <[email protected]> Cc: Michal Hocko <[email protected]> Cc: [email protected] Cc: Benjamin Herrenschmidt <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: "Aneesh Kumar K.V" <[email protected]> Cc: Ram Pai <[email protected]> Cc: Balbir Singh <[email protected]> Cc: Naoya Horiguchi <[email protected]> Cc: [email protected] Cc: Martin Schwidefsky <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Janosch Frank <[email protected]> Cc: [email protected] Cc: "David S. Miller" <[email protected]> Cc: [email protected] Cc: "Huang, Ying" <[email protected]> Zi Yan (9): arc: mm: migrate: add pmd swap entry to support thp migration. arm: mm: migrate: add pmd swap entry to support thp migration. arm64: mm: migrate: add pmd swap entry to support thp migration. i386: mm: migrate: add pmd swap entry to support thp migration. mips: mm: migrate: add pmd swap entry to support thp migration. powerpc: mm: migrate: add pmd swap entry to support thp migration. s390: mm: migrate: add pmd swap entry to support thp migration. sparc: mm: migrate: add pmd swap entry to support thp migration. mm: migrate: enable thp migration for all possible architectures. arch/arc/include/asm/pgtable.h | 2 ++ arch/arm/include/asm/pgtable.h | 2 ++ arch/arm64/include/asm/pgtable.h | 2 ++ arch/mips/include/asm/pgtable-64.h | 2 ++ arch/powerpc/include/asm/book3s/32/pgtable.h | 2 ++ arch/powerpc/include/asm/book3s/64/pgtable.h | 17 ++++++++++++ arch/powerpc/include/asm/nohash/32/pgtable.h | 2 ++ arch/powerpc/include/asm/nohash/64/pgtable.h | 2 ++ arch/s390/include/asm/pgtable.h | 5 ++++ arch/sparc/include/asm/pgtable_32.h | 2 ++ arch/sparc/include/asm/pgtable_64.h | 2 ++ arch/x86/Kconfig | 4 --- arch/x86/include/asm/pgtable-2level.h | 2 ++ arch/x86/include/asm/pgtable-3level.h | 2 ++ arch/x86/include/asm/pgtable.h | 2 -- fs/proc/task_mmu.c | 2 -- include/asm-generic/pgtable.h | 21 ++------------- include/linux/huge_mm.h | 9 +++---- include/linux/swapops.h | 4 +-- mm/Kconfig | 3 --- mm/huge_memory.c | 27 +++++++++++++------- mm/migrate.c | 6 ++--- mm/rmap.c | 5 ++-- 23 files changed, 73 insertions(+), 54 deletions(-) -- 2.17.0
