Re: [PATCH mm-unstable v15 12/13] mm/khugepaged: run khugepaged for all orders

Usama Arif
2026-02-26T15:53:49Z

On Wed, 25 Feb 2026 20:26:50 -0700 Nico Pache <npache@redhat.com> wrote:

> From: Baolin Wang <baolin.wang@linux.alibaba.com>
>
> If any order (m)THP is enabled we should allow running khugepaged to
> attempt scanning and collapsing mTHPs. In order for khugepaged to operate
> when only mTHP sizes are specified in sysfs, we must modify the predicate
> function that determines whether it ought to run to do so.
>
> This function is currently called hugepage_pmd_enabled(), this patch
> renames it to hugepage_enabled() and updates the logic to check to
> determine whether any valid orders may exist which would justify
> khugepaged running.
>
> We must also update collapse_allowable_orders() to check all orders if
> the vma is anonymous and the collapse is khugepaged.
>
> After this patch khugepaged mTHP collapse is fully enabled.
>
> Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
> Signed-off-by: Nico Pache <npache@redhat.com>
> ---
> mm/khugepaged.c | 30 ++++++++++++++++++------------
> 1 file changed, 18 insertions(+), 12 deletions(-)
>

Acked-by: Usama Arif <usama.arif@linux.dev>