Re: [PATCH v7 0/2] Optimize zone->contiguous update and issue fix

[Li, Tianyou]

Happy New Year!

Appreciated for your review and looking forward for the comments. Thanks.

Regards,

Tianyou


On 12/22/2025 10:58 PM, Tianyou Li wrote:
> This series contains 2 patches, the first one fix an issue when check
> the zone->contiguous during zone grows, the second one add a fast path
> to check the zone->contiguous.  The issue fixed by the first patch can
> be found in the original code path without the second patch.
>
> Yuan Liu (1):
>    mm/memory hotplug: fix zone->contiguous always false when hotplug
>
> Tianyou Li (1):
>    mm/memory hotplug/unplug: Optimize zone->contiguous update when
>      changes pfn range
>
>
> Changes History
> ===============
> v2 changes:
>     Add check_zone_contiguous_fast function to check zone contiguity for
>     new  memory PFN ranges.
>
> v3 changes:
>     Add zone contiguity check for empty zones.
>
> v4 changes:
>     1. Improve coding style.
>     2. Add fast path for zone contiguity check in memory unplugged cases,
>        and update test results.
>     3. Refactor set_zone_contiguous: the new set_zone_contiguous updates
>        zone contiguity based on the fast path results.
>
> v5 changes:
>     1. Improve coding style.
>     2. Fix a issue in which zone->contiguous was always false when adding
>        new memory, leveraging the fast path optimization.
>
> v6 changes:
>     1. Improve coding style.
>     2. Add comments.
>
> v7 changes:
>     1. Rebased to 6.19-rc1
>     2. Reorder the patches so that the fix will be the first in the series.
>
> Tianyou Li (2):
>    mm/memory hotplug: fix zone->contiguous always false when hotplug
>    mm/memory hotplug/unplug: Optimize zone->contiguous update when
>      changes pfn range
>
>   mm/internal.h       |  8 ++++-
>   mm/memory_hotplug.c | 75 +++++++++++++++++++++++++++++++++++++++++++--
>   mm/mm_init.c        | 12 ++++++--
>   3 files changed, 89 insertions(+), 6 deletions(-)