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| author | Guo Ren <guoren@linux.alibaba.com> | 2023-01-31 20:52:59 -0500 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-02-21 17:28:12 -0800 |
| commit | a3c7d6b642e4b4619f220bf43e8b78c34ffaecf1 (patch) | |
| tree | ea50290c552695ca28670ab5de1b784f61022f0f /arch/riscv | |
| parent | 8ac6e619d9d51b3eb5bae817db8aa94e780a0db4 (diff) | |
| download | lwn-a3c7d6b642e4b4619f220bf43e8b78c34ffaecf1.tar.gz lwn-a3c7d6b642e4b4619f220bf43e8b78c34ffaecf1.zip | |
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
<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>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20230201015259.3222524-1-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 6292baab1516..81eb031887d2 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 |