Yu Zhao <yuzhao@xxxxxxxxxx> writes:
....
diff --git a/mm/rmap.c b/mm/rmap.c
> index fedb82371efe..7cb7ef29088a 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -73,6 +73,7 @@
> #include <linux/page_idle.h>
> #include <linux/memremap.h>
> #include <linux/userfaultfd_k.h>
> +#include <linux/mm_inline.h>
>
> #include <asm/tlbflush.h>
>
> @@ -821,6 +822,12 @@ static bool folio_referenced_one(struct folio *folio,
> }
>
> if (pvmw.pte) {
> + if (lru_gen_enabled() && pte_young(*pvmw.pte) &&
> + !(vma->vm_flags & (VM_SEQ_READ | VM_RAND_READ))) {
> + lru_gen_look_around(&pvmw);
> + referenced++;
> + }
Is it required to update referenced here? we do that below after
clearing the young bit. Or is the goal to identify whether we found any
young pte around?
> +
> if (ptep_clear_flush_young_notify(vma, address,
> pvmw.pte)) {
> /*
