Re: [PATCH v5 0/5] mm/memory_hotplug: optimize zone contiguous check when changing pfn range

[Mike Rapoport]

Hi,

On Wed, May 20, 2026 at 05:34:52AM -0400, Yuan Liu wrote:
> This series introduces a pages_with_online_memmap member into struct zone
> to avoid pageblock-by-pageblock scans across the entire zone and improve
> memory hotplug performance.
> 
> For VM hotplug performance data, please refer to Patch 4.
> This series also benefits CXL hotplug. Performance results are as follows
> https://lore.kernel.org/all/20260409023552.GA2807@AE/
> 
> Yuan Liu (5):
>   mm: move mirrored memory overlap checking to the outer loop
>   mm: skip non-mirrored ZONE_NORMAL memory map init when
>     kernelcore=mirror
>   mm: remove the special early-section handling from pfn_valid() and
>     for_each_valid_pfn()
>   mm/memory_hotplug: optimize zone contiguous check when changing pfn
>     range
>   mm/memory_hotplug: improve shrink_zone_span() subsection boundary
>     checks
> 
>  Documentation/mm/physical_memory.rst | 13 +++++
>  drivers/base/memory.c                |  6 ++
>  include/linux/mmzone.h               | 60 +++++++++++++++++---
>  mm/internal.h                        |  8 +--
>  mm/memory_hotplug.c                  | 54 +++++++++---------
>  mm/mm_init.c                         | 83 +++++++++++-----------------
>  mm/sparse-vmemmap.c                  |  4 +-
>  7 files changed, 136 insertions(+), 92 deletions(-)

Sashiko has a few comments:
https://sashiko.dev/#/patchset/20260520093457.3719960-3-yuan1.liu@xxxxxxxxx

Can you please check them? 

-- 
Sincerely yours,
Mike.