Re: [PATCH v5 05/17] mm/sparse-vmemmap: support section-based vmemmap accounting

[Qi Zheng]

On 8/25/26 4:45 PM, Muchun Song wrote:
> section_nr_vmemmap_pages() can account ordinary sections and DAX sections,
> but section-based vmemmap optimization keeps its compound order in struct
> mem_section and retains a different number of vmemmap pages.
>
> Teach section_nr_vmemmap_pages() to recognize section-based optimized
> sections and calculate their vmemmap page count from the section order
> and the HVO retained page count.
>
> Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
> Acked-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
> ---
> v5:
> - Collect Acked-by from Mike Rapoport
>
> v3:
> - Add vmemmap_optimizable_order() for order-based optimization checks
>
> v2:
> - Remove an unnecessary vmemmap_can_optimize() call to simplify the code
>    (suggested by Mike Rapoport).
> - Rewrite the commit message for better understanding.
> ---
>   include/linux/mmzone.h |  6 ++++--
>   mm/sparse-vmemmap.c    | 10 ++++++----
>   mm/sparse.h            | 16 ++++++++++++++++
>   3 files changed, 26 insertions(+), 6 deletions(-)

Acked-by: Qi Zheng <qi.zheng@xxxxxxxxx>

Thanks,
Qi