Commit ff4a2443 authored by Huacai Chen's avatar Huacai Chen
Browse files

LoongArch: Select THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE 



THP_SWAP has been proven to improve the swap throughput significantly on
x86_64 system according to commit bd4c82c2 ("mm, THP, swap: delay
splitting THP after swapped out"), on ARM64 system according to commit
d0637c50 ("arm64: enable THP_SWAP for arm64") and on RISC-V system
according to commit 87f81e66 ("riscv: enable THP_SWAP for RV64").

Enable THP_SWAP for LoongArch, testing the micro-benchmark which is
introduced by commit d0637c50 ("arm64: enable THP_SWAP for arm64")
shows below numbers on the Loongson-3A5000 board:

swp out bandwidth w/o patch: 1815716 bytes/ms (mean of 10 tests)
swp out bandwidth w/  patch: 3410003 bytes/ms (mean of 10 tests)

Improved by 46.75%!

Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent d0b35b02

arch/loongarch/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -70,6 +70,7 @@ config LOONGARCH 
	select ARCH_WANT_LD_ORPHAN_WARN

	select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP

	select ARCH_WANTS_NO_INSTR

	select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE

	select BUILDTIME_TABLE_SORT

	select COMMON_CLK

	select CPU_PM