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It leverages the walk_page_range to walk the page table and gets the folio from page table. The last folio scanned is stored in damos->last_applied to prevent double counting. Signed-off-by: Yueyang Pan --- mm/damon/vaddr.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 104 insertions(+), 1 deletion(-) diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c index 87e825349bdf..6ed919e817e2 100644 --- a/mm/damon/vaddr.c +++ b/mm/damon/vaddr.c @@ -890,6 +890,109 @@ static unsigned long damos_va_migrate(struct damon_ta= rget *target, return applied * PAGE_SIZE; } =20 +struct damos_va_stat_private { + struct damos *scheme; + unsigned long *sz_filter_passed; +}; + +static inline bool damon_va_invalid_damos_folio(struct folio *folio, struc= t damos *s) +{ + return !folio || folio =3D=3D s->last_applied; +} + +static int damos_va_stat_pmd_entry(pmd_t *pmd, unsigned long addr, + unsigned long next, struct mm_walk *walk) +{ + struct damos_va_stat_private *priv =3D walk->private; + struct damos *s =3D priv->scheme; + unsigned long *sz_filter_passed =3D priv->sz_filter_passed; + struct vm_area_struct *vma =3D walk->vma; + struct folio *folio; + spinlock_t *ptl; + pte_t *start_pte, *pte, ptent; + int nr; + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + if (pmd_trans_huge(*pmd)) { + pmd_t pmde; + + ptl =3D pmd_trans_huge_lock(pmd, vma); + if (!ptl) + return 0; + pmde =3D pmdp_get(pmd); + if (!pmd_present(pmde)) + goto huge_unlock; + + folio =3D vm_normal_folio_pmd(vma, addr, pmde); + + if (damon_va_invalid_damos_folio(folio, s)) + goto huge_unlock; + + if (!damos_va_filter_out(s, folio, vma, addr, NULL, pmd)) + *sz_filter_passed +=3D folio_size(folio); + s->last_applied =3D folio; + +huge_unlock: + spin_unlock(ptl); + return 0; + } +#endif + start_pte =3D pte =3D pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); + if (!start_pte) + return 0; + + for (; addr < next; pte +=3D nr, addr +=3D nr * PAGE_SIZE) { + nr =3D 1; + ptent =3D ptep_get(pte); + + if (pte_none(ptent) || !pte_present(ptent)) + continue; + + folio =3D vm_normal_folio(vma, addr, ptent); + + if (damon_va_invalid_damos_folio(folio, s)) + continue; + + if (!damos_va_filter_out(s, folio, vma, addr, pte, NULL)) + *sz_filter_passed +=3D folio_size(folio); + nr =3D folio_nr_pages(folio); + s->last_applied =3D folio; + } + + pte_unmap_unlock(start_pte, ptl); + + return 0; +} + +static unsigned long damos_va_stat(struct damon_target *target, + struct damon_region *r, struct damos *s, + unsigned long *sz_filter_passed) +{ + + struct damos_va_stat_private priv; + struct mm_struct *mm; + struct mm_walk_ops walk_ops =3D { + .pmd_entry =3D damos_va_stat_pmd_entry, + .walk_lock =3D PGWALK_RDLOCK, + }; + + priv.scheme =3D s; + priv.sz_filter_passed =3D sz_filter_passed; + + if (!damon_scheme_has_filter(s)) + return 0; + + mm =3D damon_get_mm(target); + if (!mm) + return 0; + + mmap_read_lock(mm); + walk_page_range(mm, r->ar.start, r->ar.end, &walk_ops, &priv); + mmap_read_unlock(mm); + mmput(mm); + return 0; +} + static unsigned long damon_va_apply_scheme(struct damon_ctx *ctx, struct damon_target *t, struct damon_region *r, struct damos *scheme, unsigned long *sz_filter_passed) @@ -916,7 +1019,7 @@ static unsigned long damon_va_apply_scheme(struct damo= n_ctx *ctx, case DAMOS_MIGRATE_COLD: return damos_va_migrate(t, r, scheme, sz_filter_passed); case DAMOS_STAT: - return 0; + return damos_va_stat(t, r, scheme, sz_filter_passed); default: /* * DAMOS actions that are not yet supported by 'vaddr'. --=20 2.47.3