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List-Unsubscribe: On Tue, Jun 24, 2025 at 05:56:07AM +0000, Raghavendra K T wrote: > Since we already have the list of mm_struct in the system, add a module to > scan each mm that walks VMAs of each mm_struct and scan all the pages > associated with that. > > In the scan path: Check for the recently acccessed pages (folios) belonging > to slowtier nodes. Add all those folios to a list. > > Signed-off-by: Raghavendra K T > --- Hi, just taking a quick look... > mm/kscand.c | 319 +++++++++++++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 318 insertions(+), 1 deletion(-) > > diff --git a/mm/kscand.c b/mm/kscand.c > index d5b0d3041b0f..0edec1b7730d 100644 > --- a/mm/kscand.c > +++ b/mm/kscand.c > @@ -42,6 +55,8 @@ static struct kmem_cache *kscand_slot_cache __read_mostly; > @@ -84,11 +122,275 @@ static void kscand_wait_work(void) > scan_sleep_jiffies); > } > > +static inline bool is_valid_folio(struct folio *folio) > +{ > + if (!folio || folio_test_unevictable(folio) || !folio_mapped(folio) || > + folio_is_zone_device(folio) || folio_maybe_mapped_shared(folio)) > + return false; > + > + return true; > +} What makes it undesirable to migrate shared folios? > +static bool folio_idle_clear_pte_refs_one(struct folio *folio, > + struct vm_area_struct *vma, > + unsigned long addr, > + pte_t *ptep) > +{ > + bool referenced = false; > + struct mm_struct *mm = vma->vm_mm; > + pmd_t *pmd = pmd_off(mm, addr); > + > + if (ptep) { > + if (ptep_clear_young_notify(vma, addr, ptep)) > + referenced = true; > + } else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { > + if (!pmd_present(*pmd)) > + WARN_ON_ONCE(1); > + if (pmdp_clear_young_notify(vma, addr, pmd)) > + referenced = true; > + } else { > + WARN_ON_ONCE(1); > + } This does not look good. I think pmd entry handling should be handled in mm_walk_ops.pmd_entry callback? > + > + if (referenced) { > + folio_clear_idle(folio); > + folio_set_young(folio); > + } > + > + return true; > +} > + > +static void page_idle_clear_pte_refs(struct page *page, pte_t *pte, struct mm_walk *walk) > +{ > + bool need_lock; > + struct folio *folio = page_folio(page); > + unsigned long address; > + > + if (!folio_mapped(folio) || !folio_raw_mapping(folio)) > + return; > + > + need_lock = !folio_test_anon(folio) || folio_test_ksm(folio); > + if (need_lock && !folio_trylock(folio)) > + return; Why acquire folio lock here? And I'm not even sure if it's safe to acquire it? The locking order is folio_lock -> pte_lock page walk should have already acquired pte_lock before calling ->pte_entry() callback. > + address = vma_address(walk->vma, page_pgoff(folio, page), compound_nr(page)); > + VM_BUG_ON_VMA(address == -EFAULT, walk->vma); > + folio_idle_clear_pte_refs_one(folio, walk->vma, address, pte); > + > + if (need_lock) > + folio_unlock(folio); > +} > + > +static const struct mm_walk_ops hot_vma_set_idle_ops = { > + .pte_entry = hot_vma_idle_pte_entry, > + .walk_lock = PGWALK_RDLOCK, > +}; > + > +static void kscand_walk_page_vma(struct vm_area_struct *vma, struct kscand_scanctrl *scanctrl) > +{ > + if (!vma_migratable(vma) || !vma_policy_mof(vma) || > + is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP)) { > + return; > + } > + if (!vma->vm_mm || > + (vma->vm_file && (vma->vm_flags & (VM_READ|VM_WRITE)) == (VM_READ))) > + return; Why not walk writable file VMAs? > + if (!vma_is_accessible(vma)) > + return; > + > + walk_page_vma(vma, &hot_vma_set_idle_ops, scanctrl); > +} -- Cheers, Harry / Hyeonggon