Re: [PATCH] mm/memory hotplug/unplug: Optimize zone contiguous check when changing pfn range

[Chen, Yu C]

On 3/26/2026 3:30 PM, Liu, Yuan1 wrote:
> > -----Original Message-----

[ .... ]

> Btw, can we introduce a new kernel command-line parameter to allow users to select
> the memory block size? This could also address the current issue.
>
> Test Results as below, memory block size 128MB Vs. 2GB
> +----------------+------+---------------+--------------+----------------+
> |                | Size |    128MG      |    2GB       | Time Reduction |
> |                +------+---------------+--------------+----------------+
> | Plug Memory    | 256G |      10s      |       3s     |       70%      |
> |                +------+---------------+--------------+----------------+
> |                | 512G |      36s      |       7s     |       81%      |
> +----------------+------+---------------+--------------+----------------+
>   
> +----------------+------+---------------+--------------+----------------+
> |                | Size |    128MG      |    2GB       | Time Reduction |
> |                +------+---------------+--------------+----------------+
> | Unplug Memory  | 256G |      11s      |      3s      |       72%      |
> |                +------+---------------+--------------+----------------+
> |                | 512G |      36s      |      7s      |       81%      |
> +----------------+------+---------------+--------------+----------------+
>
> And I see the UV system has already this (Kernel parameter is uv_memblksize).
> I think if we can introduce a common kernel parameter for memory block size configuration?

Is it possible to turn uv_memblksize into a generic commandline 
memblksize without
introducing extra parameter?

thanks,
Chenyu