Re: [PATCH 4/7] mm/mglru: move max_seq read into walk_update_folio

[Baolin Wang]

On 8/18/26 1:38 PM, Kairui Song via B4 Relay wrote:
> From: Kairui Song <kasong@xxxxxxxxxxx>
>
> walk_pte_range(), walk_pmd_range_locked(), and lru_gen_look_around()
> each read lrugen->max_seq to compute the target generation used by
> walk_update_folio(), then pass it as a parameter. Move the read into
> walk_update_folio() itself so the callers no longer need to compute
> or pass the value.
>
> The max_seq read now happens once per folio update rather than once
> per walk range, so folios always get promoted to the current youngest
> generation.
>
> Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
> Reviewed-by: Baoquan He <baoquan.he@xxxxxxxxx>
> ---

LGTM. One nit below.
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>

>   mm/vmscan.c | 29 ++++++++++++-----------------
>   1 file changed, 12 insertions(+), 17 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 080132997d87..a819be6b7ae9 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -3517,13 +3517,15 @@ static bool suitable_to_scan(int total, int young)
>   }
>   
>   static void walk_update_folio(struct lru_gen_mm_walk *walk, struct vm_area_struct *vma,
> -		struct folio *folio, int new_gen, bool dirty)
> +			      struct lruvec *lruvec, struct folio *folio, bool dirty)

IIRC, MM maintainers prefer 2 tabs, which is why I changed this earlier:)