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riscv: enable HAVE_FAST_GUP if MMU

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Activate the fast gup for riscv mmu platforms. Here are some
GUP_FAST_BENCHMARK performance numbers:

Before the patch:
GUP_FAST_BENCHMARK: Time: get:53203 put:5085 us

After the patch:
GUP_FAST_BENCHMARK: Time: get:17711 put:5060 us

The get time is reduced by 66.7%! IOW, 3x get speed!

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20231219175046.2496-5-jszhang@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Jisheng Zhang 2023-12-20 01:50:46 +08:00 committed by Palmer Dabbelt
parent 69be3fb111
commit 3f910b7a52
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2 changed files with 7 additions and 0 deletions
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1
arch/riscv/Kconfig
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@ -119,6 +119,7 @@ config RISCV
select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !PREEMPTION
select HAVE_EBPF_JIT if MMU
select HAVE_FAST_GUP if MMU
select HAVE_FUNCTION_ARG_ACCESS_API
select HAVE_FUNCTION_ERROR_INJECTION
select HAVE_GCC_PLUGINS

6
arch/riscv/include/asm/pgtable.h
View File

@ -673,6 +673,12 @@ static inline int pmd_write(pmd_t pmd)
return pte_write(pmd_pte(pmd));
}
#define pud_write pud_write
static inline int pud_write(pud_t pud)
{
return pte_write(pud_pte(pud));
}
static inline int pmd_dirty(pmd_t pmd)
{
return pte_dirty(pmd_pte(pmd));