Re: [PATCH v2 2/5] huge_memory: add huge_zero_page_shrinker_(init|exit) function

[David Hildenbrand <david@redhat.com>]

On 07.07.25 16:23, Pankaj Raghav (Samsung) wrote:
> From: Pankaj Raghav <p.raghav@samsung.com>
> 
> Add huge_zero_page_shrinker_init() and huge_zero_page_shrinker_exit().
> As shrinker will not be needed when static PMD zero page is enabled,
> these two functions can be a no-op.
> 
> This is a preparation patch for static PMD zero page. No functional
> changes.
> 
> Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
> ---
>   mm/huge_memory.c | 38 +++++++++++++++++++++++++++-----------
>   1 file changed, 27 insertions(+), 11 deletions(-)
> 
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index d3e66136e41a..101b67ab2eb6 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -289,6 +289,24 @@ static unsigned long shrink_huge_zero_page_scan(struct shrinker *shrink,
>   }
>   
>   static struct shrinker *huge_zero_page_shrinker;
> +static int huge_zero_page_shrinker_init(void)
> +{
> +	huge_zero_page_shrinker = shrinker_alloc(0, "thp-zero");
> +	if (!huge_zero_page_shrinker)
> +		return -ENOMEM;
> +
> +	huge_zero_page_shrinker->count_objects = shrink_huge_zero_page_count;
> +	huge_zero_page_shrinker->scan_objects = shrink_huge_zero_page_scan;
> +	shrinker_register(huge_zero_page_shrinker);
> +	return 0;
> +}
> +
> +static void huge_zero_page_shrinker_exit(void)
> +{
> +	shrinker_free(huge_zero_page_shrinker);
> +	return;
> +}

While at it, we should rename most of that to "huge_zero_folio" I assume.

-- 
Cheers,

David / dhildenb