Re: [PATCH mm-unstable v15 09/13] mm/khugepaged: introduce collapse_allowable_orders helper function

["Lorenzo Stoakes (Oracle)" <ljs@kernel.org>]

On Wed, Feb 25, 2026 at 08:25:42PM -0700, Nico Pache wrote:
> Add collapse_allowable_orders() to generalize THP order eligibility. The
> function determines which THP orders are permitted based on collapse
> context (khugepaged vs madv_collapse).
>
> This consolidates collapse configuration logic and provides a clean
> interface for future mTHP collapse support where the orders may be
> different.
>
> Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
> Signed-off-by: Nico Pache <npache@redhat.com>
> ---
>  mm/khugepaged.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> index 2e66d660ee8e..2fdfb6d42cf9 100644
> --- a/mm/khugepaged.c
> +++ b/mm/khugepaged.c
> @@ -486,12 +486,22 @@ static unsigned int collapse_max_ptes_none(unsigned int order)
>  	return -EINVAL;
>  }
>
> +/* Check what orders are allowed based on the vma and collapse type */
> +static unsigned long collapse_allowable_orders(struct vm_area_struct *vma,
> +			vm_flags_t vm_flags, bool is_khugepaged)

You're always passing vma->vm_flags, maybe just pass vma and you can grab
vma->vm_flags?

Really it would be better for it to be &vma->flags, but probably best to wait
for me to do a follow up VMA flags series for that.

> +{
> +	enum tva_type tva_flags = is_khugepaged ? TVA_KHUGEPAGED : TVA_FORCED_COLLAPSE;
> +	unsigned long orders = BIT(HPAGE_PMD_ORDER);

Const?

Also not sure if we decided BIT() was right here or not :P For me fine though.

> +
> +	return thp_vma_allowable_orders(vma, vm_flags, tva_flags, orders);
> +}
> +
>  void khugepaged_enter_vma(struct vm_area_struct *vma,
>  			  vm_flags_t vm_flags)
>  {
>  	if (!mm_flags_test(MMF_VM_HUGEPAGE, vma->vm_mm) &&
>  	    hugepage_pmd_enabled()) {
> -		if (thp_vma_allowable_order(vma, vm_flags, TVA_KHUGEPAGED, PMD_ORDER))
> +		if (collapse_allowable_orders(vma, vm_flags, /*is_khugepaged=*/true))

I agree with David, let's pass through the enum value please :)

>  			__khugepaged_enter(vma->vm_mm);
>  	}
>  }
> @@ -2637,7 +2647,7 @@ static unsigned int collapse_scan_mm_slot(unsigned int pages, enum scan_result *
>  			progress++;
>  			break;
>  		}
> -		if (!thp_vma_allowable_order(vma, vma->vm_flags, TVA_KHUGEPAGED, PMD_ORDER)) {
> +		if (!collapse_allowable_orders(vma, vma->vm_flags, /*is_khugepaged=*/true)) {
>  			progress++;
>  			continue;
>  		}
> @@ -2949,7 +2959,7 @@ int madvise_collapse(struct vm_area_struct *vma, unsigned long start,
>  	BUG_ON(vma->vm_start > start);
>  	BUG_ON(vma->vm_end < end);
>
> -	if (!thp_vma_allowable_order(vma, vma->vm_flags, TVA_FORCED_COLLAPSE, PMD_ORDER))
> +	if (!collapse_allowable_orders(vma, vma->vm_flags, /*is_khugepaged=*/false))
>  		return -EINVAL;
>
>  	cc = kmalloc_obj(*cc);
> --
> 2.53.0
>

Cheers, Lorenzo