From: Guo Ren Date: Wed, 1 Feb 2023 01:52:59 +0000 (-0500) Subject: riscv: mm: hugetlb: Enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a3c7d6b642e4b4619f220bf43e8b78c34ffaecf1;p=linux.git riscv: mm: hugetlb: Enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP Add HVO support for RISC-V; see commit 6be24bed9da3 ("mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP"). This patch is similar to commit 1e63ac088f20 ("arm64: mm: hugetlb: enable HUGETLB_PAGE_FREE_VMEMMAP for arm64"), and riscv's motivation is the same as arm64. The current riscv was ready to enable HVO after fixup, ref commit d33deda095d3 ("riscv/mm: hugepage's PG_dcache_clean flag is only set in head page"). See Documentation/mm/vmemmap_dedup.rst for more details. The HugeTLB VmemmapvOptimization (HVO) defaults to off in Kconfig. Here is the riscv test log: cat /proc/sys/vm/hugetlb_optimize_vmemmap echo 8 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages mount -t hugetlbfs none test/ -o pagesize=2048k Signed-off-by: Guo Ren Signed-off-by: Guo Ren Link: https://lore.kernel.org/linux-riscv/1F5AF29D-708A-483B-A29F-CAEE6F554866@linux.dev/ Acked-by: Muchun Song Reviewed-by: Andrew Jones Link: https://lore.kernel.org/r/20230201015259.3222524-1-guoren@kernel.org Signed-off-by: Palmer Dabbelt --- diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 6292baab15166..81eb031887d2f 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -46,6 +46,7 @@ config RISCV select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_GENERAL_HUGETLB + select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP select ARCH_WANT_HUGE_PMD_SHARE if 64BIT select ARCH_WANT_LD_ORPHAN_WARN if !XIP_KERNEL select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE