From d062a79b7c80064d5b40bcd78009fe30adde5cea Mon Sep 17 00:00:00 2001 From: Nanyong Sun Date: Tue, 23 Nov 2021 22:06:38 +0800 Subject: [PATCH] riscv/mm: Enable THP migration 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 Signed-off-by: Palmer Dabbelt --- 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 09e5b9f31d049..de89279c8f576 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -76,6 +76,7 @@ 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 34230c2773587..67f687aee673e 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. -- GitLab