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riscv: mremap speedup - enable HAVE_MOVE_PUD and HAVE_MOVE_PMD

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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>
This commit is contained in:
Jisheng Zhang 2021-04-17 00:37:22 +08:00 committed by Palmer Dabbelt
parent e88b333142
commit 3332f41906
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2 changed files with 13 additions and 0 deletions
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2
arch/riscv/Kconfig
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@ -82,6 +82,8 @@ config RISCV
select HAVE_KPROBES
select HAVE_KPROBES_ON_FTRACE
select HAVE_KRETPROBES
select HAVE_MOVE_PMD
select HAVE_MOVE_PUD
select HAVE_PCI
select HAVE_PERF_EVENTS
select HAVE_PERF_REGS

11
arch/riscv/include/asm/pgtable.h
View File

@ -241,6 +241,11 @@ static inline pte_t pmd_pte(pmd_t pmd)
return __pte(pmd_val(pmd));
}
static inline pte_t pud_pte(pud_t pud)
{
return __pte(pud_val(pud));
}
/* Yields the page frame number (PFN) of a page table entry */
static inline unsigned long pte_pfn(pte_t pte)
{
@ -570,6 +575,12 @@ static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
return set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd));
}
static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
pud_t *pudp, pud_t pud)
{
return set_pte_at(mm, addr, (pte_t *)pudp, pud_pte(pud));
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline int pmd_trans_huge(pmd_t pmd)
{