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mm: hugetlb_vmemmap: introduce the name HVO

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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/21aae898-d54d-cc4b-a11f-1bb7fddcfffa@redhat.com/ [1]
Link: https://lkml.kernel.org/r/20220628092235.91270-4-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Will Deacon <will@kernel.org>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Muchun Song
2022-06-28 17:22:30 +08:00
committed by Andrew Morton
parent cf5472e561
commit dff033818a
9 changed files with 23 additions and 24 deletions
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3
Documentation/admin-guide/sysctl/vm.rst
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@@ -569,8 +569,7 @@ This knob is not available when the size of 'struct page' (a structure defined
in include/linux/mm_types.h) is not power of two (an unusual system config could
result in this).
Enable (set to 1) or disable (set to 0) the feature of optimizing vmemmap pages
associated with each HugeTLB page.
Enable (set to 1) or disable (set to 0) HugeTLB Vmemmap Optimization (HVO).
Once enabled, the vmemmap pages of subsequent allocation of HugeTLB pages from
buddy allocator will be optimized (7 pages per 2MB HugeTLB page and 4095 pages