On Wed, Oct 05, 2022 at 07:35:53PM -0700, Palmer Dabbelt wrote:
On Sun, 21 Aug 2022 10:05:59 PDT (-0700), jszhang@xxxxxxxxxx wrote:
> I have a Sipeed Lichee RV dock board which only has 512MB DDR, so
> memory optimizations such as swap on zram are helpful. As is seen
> in commit d0637c505f8a ("arm64: enable THP_SWAP for arm64") and
> commit bd4c82c22c367e ("mm, THP, swap: delay splitting THP after
> swapped out"), THP_SWAP can improve the swap throughput significantly.
> Enable THP_SWAP for RV64, testing the micro-benchmark which is
> introduced by commit d0637c505f8a ("arm64: enable THP_SWAP for arm64")
> shows below numbers on the Lichee RV dock board:
> thp swp throughput w/o patch: 66908 bytes/ms (mean of 10 tests)
> thp swp throughput w/ patch: 322638 bytes/ms (mean of 10 tests)
> Improved by 382%!
> Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx>
> arch/riscv/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index ed66c31e4655..19088c750c7f 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -45,6 +45,7 @@ config RISCV
> select ARCH_WANT_FRAME_POINTERS
> select ARCH_WANT_GENERAL_HUGETLB
> select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
> + select ARCH_WANTS_THP_SWAP if TRANSPARENT_HUGEPAGE
> select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU
> select BUILDTIME_TABLE_SORT if MMU
> select CLONE_BACKWARDS
Thanks, this is on for-next.
FYI, this is v1 of a patchset that went to v3.
v3 only changed the commit message, but v2 had a functional change.
v3 is here: