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>

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Jisheng Zhang 2021-04-17 00:37:22 +08:00 • committed by Palmer Dabbelt

parent e88b333142

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2

arch/riscv/Kconfig

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11

arch/riscv/include/asm/pgtable.h

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