Messages in this thread Patch in this message | | | From | Nanyong Sun <> | Subject | [PATCH -next 2/2] riscv/mm: Enable THP migration | Date | Tue, 23 Nov 2021 22:06:38 +0800 |
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Add two THP helpers required to create PMD migration swap entries, and enable THP migration via ARCH_ENABLE_THP_MIGRATION. This can reduce time of THP migration without splitting and guarantee the migrated pages are still contiguous.
Signed-off-by: Nanyong Sun <sunnanyong@huawei.com> --- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/pgtable.h | 5 +++++ 2 files changed, 6 insertions(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 821252b65f89..7cad1a8e71bf 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -75,6 +75,7 @@ config RISCV select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT && MMU + select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE select HAVE_ARCH_THREAD_STRUCT_WHITELIST select HAVE_ARCH_VMAP_STACK if MMU && 64BIT select HAVE_ASM_MODVERSIONS diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 8bb2010f9a25..b9bf51e31adc 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -649,6 +649,11 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION +#define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) +#define __swp_entry_to_pmd(swp) __pmd((swp).val) +#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */ + /* * In the RV64 Linux scheme, we give the user half of the virtual-address space * and give the kernel the other (upper) half. -- 2.25.1
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