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>

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Jisheng Zhang 2023-12-20 01:50:46 +08:00 • committed by Palmer Dabbelt

parent 69be3fb111

commit 3f910b7a52

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1

arch/riscv/Kconfig

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6

arch/riscv/include/asm/pgtable.h

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