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    SubjectRe: [PATCH 3/6] mm: hugetlb_vmemmap: introduce the name HVO
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    On 13.06.22 08:35, Muchun Song wrote:
    > 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]
    > Signed-off-by: Muchun Song <songmuchun@bytedance.com>
    > ---
    > Documentation/admin-guide/kernel-parameters.txt | 7 ++++---
    > Documentation/admin-guide/mm/hugetlbpage.rst | 3 +--
    > Documentation/admin-guide/sysctl/vm.rst | 3 +--
    > fs/Kconfig | 13 ++++++-------
    > mm/hugetlb_vmemmap.c | 8 ++++----
    > mm/hugetlb_vmemmap.h | 4 ++--
    > 6 files changed, 18 insertions(+), 20 deletions(-)
    >
    > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
    > index 391b43fee93e..7539553b3fb0 100644
    > --- a/Documentation/admin-guide/kernel-parameters.txt
    > +++ b/Documentation/admin-guide/kernel-parameters.txt
    > @@ -1725,12 +1725,13 @@
    > hugetlb_free_vmemmap=
    > [KNL] Reguires CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
    > enabled.
    > + Control if HugeTLB Vmemmap Optimization (HVO) is enabled.
    > Allows heavy hugetlb users to free up some more
    > memory (7 * PAGE_SIZE for each 2MB hugetlb page).
    > - Format: { [oO][Nn]/Y/y/1 | [oO][Ff]/N/n/0 (default) }
    > + Format: { on | off (default) }
    >
    > - [oO][Nn]/Y/y/1: enable the feature
    > - [oO][Ff]/N/n/0: disable the feature
    > + on: enable HVO
    > + off: disable HVO
    >
    > Built with CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON=y,
    > the default is on.
    > diff --git a/Documentation/admin-guide/mm/hugetlbpage.rst b/Documentation/admin-guide/mm/hugetlbpage.rst
    > index a90330d0a837..64e0d5c512e7 100644
    > --- a/Documentation/admin-guide/mm/hugetlbpage.rst
    > +++ b/Documentation/admin-guide/mm/hugetlbpage.rst
    > @@ -164,8 +164,7 @@ default_hugepagesz
    > will all result in 256 2M huge pages being allocated. Valid default
    > huge page size is architecture dependent.
    > hugetlb_free_vmemmap
    > - When CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP is set, this enables optimizing
    > - unused vmemmap pages associated with each HugeTLB page.
    > + When CONFIG_HUGETLB_PAGE_OPTIMIZE_VMEMMAP is set, this enables HVO.

    Heh, it would be convenient to call this

    CONFIG_HUGETLB_PAGE_VMEMMAP_OPTIMIZATION (HVO) then.

    --
    Thanks,

    David / dhildenb

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