Re: [PATCH v2] mm, hugetlb: implement movable_gigantic_pages sysctl

[Gregory Price]

On Tue, Nov 25, 2025 at 11:24:24AM +0100, David Hildenbrand (Red Hat) wrote:
> On 11/21/25 20:27, Gregory Price wrote:
> 
> Can we also reference this parameter here from
> Documentation/admin-guide/mm/memory-hotplug.rst?
> 

Good call

> In particular, there we also talk about gigantic pages and the interaction
> with ZONE_MOVABLE:
> 
> "
> - Gigantic pages are unmovable, resulting in user space consuming a
>   lot of unmovable memory.
> 
> - Huge pages are unmovable when an architectures does not support huge
>   page migration, resulting in a similar issue as with gigantic pages.
> "
> 
> And then later, we talk about "Even with ZONE_MOVABLE, there are some corner
> cases where offlining a memory
> block might fail:" where this should be spelled out as well.
> 

I will take a look, thank you!

> -- 
> Cheers
> 
> David