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. Suggested-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx> --- 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 9f5bd41bf660..e69d42528542 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -119,6 +119,7 @@ config X86 select ARCH_WANTS_DYNAMIC_TASK_STRUCT select ARCH_WANTS_NO_INSTR 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 ARCH_HAS_PARANOID_L1D_FLUSH diff --git a/fs/Kconfig b/fs/Kconfig index 6c7dc1387beb..f6db2af33738 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -245,9 +245,17 @@ 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 -- 2.11.0
