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The config option is introduced early so that supporting code can be written to depend on the option. The initial version of the code only provides support for x86-64. Like other code which frees vmemmap, this config option depends on HAVE_BOOTMEM_INFO_NODE. The routine register_page_bootmem_info() is used to register bootmem info. Therefore, make sure register_page_bootmem_info is enabled if HUGETLB_PAGE_FREE_VMEMMAP is defined. Signed-off-by: Muchun Song Reviewed-by: Oscar Salvador Acked-by: Mike Kravetz --- arch/x86/mm/init_64.c | 2 +- fs/Kconfig | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 0a45f062826e..0435bee2e172 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1225,7 +1225,7 @@ static struct kcore_list kcore_vsyscall; =20 static void __init register_page_bootmem_info(void) { -#ifdef CONFIG_NUMA +#if defined(CONFIG_NUMA) || defined(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP) int i; =20 for_each_online_node(i) diff --git a/fs/Kconfig b/fs/Kconfig index 976e8b9033c4..e7c4c2a79311 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -245,6 +245,24 @@ config HUGETLBFS config HUGETLB_PAGE def_bool HUGETLBFS =20 +config HUGETLB_PAGE_FREE_VMEMMAP + def_bool HUGETLB_PAGE + depends on X86_64 + depends on SPARSEMEM_VMEMMAP + depends on HAVE_BOOTMEM_INFO_NODE + help + The option HUGETLB_PAGE_FREE_VMEMMAP allows for the freeing of + some vmemmap pages associated with pre-allocated HugeTLB pages. + For example, on X86_64 6 vmemmap pages of size 4KB each can be + saved for each 2MB HugeTLB page. 4094 vmemmap pages of size 4KB + each can be saved for each 1GB HugeTLB page. + + When a HugeTLB page is allocated or freed, the vmemmap array + representing the range associated with the page will need to be + remapped. When a page is allocated, vmemmap pages are freed + after remapping. When a page is freed, previously discarded + vmemmap pages must be allocated before remapping. + config MEMFD_CREATE def_bool TMPFS || HUGETLBFS =20 --=20 2.11.0