Messages in this thread Patch in this message | | | From | guoren@kernel ... | Subject | [PATCH -next V2] riscv: mm: hugetlb: Enable ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP | Date | Fri, 27 Jan 2023 00:04:21 -0500 |
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From: Guo Ren <guoren@linux.alibaba.com>
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").
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 <Try some simple hugetlb test in test dir, no problem found.>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org> Link: https://lore.kernel.org/linux-riscv/1F5AF29D-708A-483B-A29F-CAEE6F554866@linux.dev/ Acked-by: Muchun Song <songmuchun@bytedance.com> --- Changelog: V2: - Optimize the commit log - Remove riscv page compound_head fixup which has been merged. - Rebase on riscv for-next (20230127) - Add HVO author's acked-by
V1: https://lore.kernel.org/linux-riscv/20221023133205.3493564-1-guoren@kernel.org/ --- arch/riscv/Kconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index e2b656043abf..949974a38a41 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -46,6 +46,7 @@ config RISCV select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_GENERAL_HUGETLB select ARCH_WANT_HUGE_PMD_SHARE if 64BIT + select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU select BUILDTIME_TABLE_SORT if MMU -- 2.36.1
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