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riscv: mremap speedup - enable HAVE_MOVE_PUD and HAVE_MOVE_PMD
HAVE_MOVE_PUD enables remapping pages at the PUD level if both the source and destination addresses are PUD-aligned. HAVE_MOVE_PMD does similar speedup on the PMD level. With HAVE_MOVE_PUD enabled, there is about a 143x improvement on qemu With HAVE_MOVE_PMD enabled, there is about a 5x improvement on qemu Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
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@ -82,6 +82,8 @@ config RISCV
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select HAVE_KPROBES
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select HAVE_KPROBES_ON_FTRACE
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select HAVE_KRETPROBES
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select HAVE_MOVE_PMD
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select HAVE_MOVE_PUD
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select HAVE_PCI
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select HAVE_PERF_EVENTS
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select HAVE_PERF_REGS
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@ -241,6 +241,11 @@ static inline pte_t pmd_pte(pmd_t pmd)
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return __pte(pmd_val(pmd));
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}
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static inline pte_t pud_pte(pud_t pud)
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{
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return __pte(pud_val(pud));
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}
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/* Yields the page frame number (PFN) of a page table entry */
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static inline unsigned long pte_pfn(pte_t pte)
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{
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@ -570,6 +575,12 @@ static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
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return set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd));
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}
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static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
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pud_t *pudp, pud_t pud)
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{
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return set_pte_at(mm, addr, (pte_t *)pudp, pud_pte(pud));
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}
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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static inline int pmd_trans_huge(pmd_t pmd)
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{
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