From: Muchun Song songmuchun@bytedance.com
mainline inclusion from mainline-v5.19-rc1 commit 2e4ec02bbcc05b8905d65c763ebde6bc85508e90 category: feature bugzilla: 187198, https://gitee.com/openeuler/kernel/issues/I5GVFO CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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The feature of minimizing overhead of struct page associated with each HugeTLB page is implemented on x86_64, however, the infrastructure of this feature is already there, we could easily enable it for other architectures. Introduce ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP for other architectures to be easily enabled. Just select this config if they want to enable this feature.
Link: https://lkml.kernel.org/r/20220331065640.5777-1-songmuchun@bytedance.com Signed-off-by: Muchun Song songmuchun@bytedance.com Suggested-by: Andrew Morton akpm@linux-foundation.org Reviewed-by: Barry Song baohua@kernel.org Tested-by: Barry Song baohua@kernel.org Reviewed-by: Anshuman Khandual anshuman.khandual@arm.com Cc: Bodeddula Balasubramaniam bodeddub@amazon.com Cc: Catalin Marinas catalin.marinas@arm.com Cc: David Hildenbrand david@redhat.com Cc: David Rientjes rientjes@google.com Cc: Fam Zheng fam.zheng@bytedance.com Cc: James Morse james.morse@arm.com Cc: Mark Rutland mark.rutland@arm.com Cc: Mike Kravetz mike.kravetz@oracle.com Cc: Oscar Salvador osalvador@suse.de Cc: Will Deacon will@kernel.org Cc: Xiongchun Duan duanxiongchun@bytedance.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Liu Shixin liushixin2@huawei.com Reviewed-by: Kefeng Wang wangkefeng.wang@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- arch/x86/Kconfig | 1 + fs/Kconfig | 10 +++++++++- 2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index d17396ef4323..661e05e1f762 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -103,6 +103,7 @@ config X86 select ARCH_WANT_DEFAULT_BPF_JIT if X86_64 select ARCH_WANTS_DYNAMIC_TASK_STRUCT select ARCH_WANT_HUGE_PMD_SHARE + select ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP if X86_64 select ARCH_WANT_LD_ORPHAN_WARN select ARCH_WANTS_THP_SWAP if X86_64 select BUILDTIME_TABLE_SORT diff --git a/fs/Kconfig b/fs/Kconfig index 37a8895a3254..b60a7614cb16 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -237,9 +237,17 @@ config HUGETLBFS config HUGETLB_PAGE def_bool HUGETLBFS
+# +# Select this config option from the architecture Kconfig, if it is preferred +# to enable the feature of minimizing overhead of struct page associated with +# each HugeTLB page. +# +config ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP + bool + config HUGETLB_PAGE_FREE_VMEMMAP def_bool HUGETLB_PAGE - depends on X86_64 + depends on ARCH_WANT_HUGETLB_PAGE_FREE_VMEMMAP depends on SPARSEMEM_VMEMMAP
config HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON