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It it inconvenient to mention the feature of optimizing vmemmap pages associated with HugeTLB pages when communicating with others since there is no specific or abbreviated name for it when it is first introduced. Let us give it a name HVO (HugeTLB Vmemmap Optimization) from now. This commit also updates the document about "hugetlb_free_vmemmap" by the way discussed in thread [1]. Link: https://lore.kernel.org/all/[email protected]/ [1] Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Muchun Song <[email protected]> Reviewed-by: Oscar Salvador <[email protected]> Reviewed-by: Mike Kravetz <[email protected]> Cc: Anshuman Khandual <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: Jonathan Corbet <[email protected]> Cc: Will Deacon <[email protected]> Cc: Xiongchun Duan <[email protected]> Signed-off-by: Andrew Morton <[email protected]>