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riscv/mm: Enable THP migration

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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>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Nanyong Sun 2021-11-23 22:06:38 +08:00 committed by Palmer Dabbelt
parent fba88ede6a
commit d062a79b7c
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2 changed files with 6 additions and 0 deletions
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1
arch/riscv/Kconfig
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@ -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

5
arch/riscv/include/asm/pgtable.h
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@ -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.