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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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12
fs/Kconfig
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@@ -247,8 +247,7 @@ config HUGETLB_PAGE
#
# 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.
# to enable the feature of HugeTLB Vmemmap Optimization (HVO).
#
config ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
bool
@@ -259,14 +258,13 @@ config HUGETLB_PAGE_OPTIMIZE_VMEMMAP
depends on SPARSEMEM_VMEMMAP
config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
bool "Default optimizing vmemmap pages of HugeTLB to on"
bool "HugeTLB Vmemmap Optimization (HVO) defaults to on"
default n
depends on HUGETLB_PAGE_OPTIMIZE_VMEMMAP
help
When using HUGETLB_PAGE_OPTIMIZE_VMEMMAP, the optimizing unused vmemmap
pages associated with each HugeTLB page is default off. Say Y here
to enable optimizing vmemmap pages of HugeTLB by default. It can then
be disabled on the command line via hugetlb_free_vmemmap=off.
The HugeTLB VmemmapvOptimization (HVO) defaults to off. Say Y here to
enable HVO by default. It can be disabled via hugetlb_free_vmemmap=off
(boot command line) or hugetlb_optimize_vmemmap (sysctl).
config MEMFD_CREATE
def_bool TMPFS || HUGETLBFS