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This removes a couple of calls to > compound_head(). > > Signed-off-by: Vishal Moola (Oracle) > --- > mm/mempolicy.c | 34 +++++++++++++++------------------- > 1 file changed, 15 insertions(+), 19 deletions(-) > > diff --git a/mm/mempolicy.c b/mm/mempolicy.c > index 0a3690ecab7d..253ce368cf16 100644 > --- a/mm/mempolicy.c > +++ b/mm/mempolicy.c > @@ -414,7 +414,7 @@ static const struct mempolicy_operations mpol_ops[MPOL_MAX] = { > }, > }; > > -static int migrate_page_add(struct page *page, struct list_head *pagelist, > +static int migrate_folio_add(struct folio *folio, struct list_head *foliolist, > unsigned long flags); > > struct queue_pages { > @@ -476,7 +476,7 @@ static int queue_folios_pmd(pmd_t *pmd, spinlock_t *ptl, unsigned long addr, > /* go to folio migration */ > if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) { > if (!vma_migratable(walk->vma) || > - migrate_page_add(&folio->page, qp->pagelist, flags)) { > + migrate_folio_add(folio, qp->pagelist, flags)) { > ret = 1; > goto unlock; > } > @@ -544,7 +544,7 @@ static int queue_folios_pte_range(pmd_t *pmd, unsigned long addr, > * temporary off LRU pages in the range. Still > * need migrate other LRU pages. > */ > - if (migrate_page_add(&folio->page, qp->pagelist, flags)) > + if (migrate_folio_add(folio, qp->pagelist, flags)) > has_unmovable = true; > } else > break; > @@ -1022,27 +1022,23 @@ static long do_get_mempolicy(int *policy, nodemask_t *nmask, > } > > #ifdef CONFIG_MIGRATION > -/* > - * page migration, thp tail pages can be passed. > - */ > -static int migrate_page_add(struct page *page, struct list_head *pagelist, > +static int migrate_folio_add(struct folio *folio, struct list_head *foliolist, > unsigned long flags) > { > - struct page *head = compound_head(page); > /* > - * Avoid migrating a page that is shared with others. > + * Avoid migrating a folio that is shared with others. > */ > - if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(head) == 1) { > - if (!isolate_lru_page(head)) { > - list_add_tail(&head->lru, pagelist); > - mod_node_page_state(page_pgdat(head), > - NR_ISOLATED_ANON + page_is_file_lru(head), > - thp_nr_pages(head)); > + if ((flags & MPOL_MF_MOVE_ALL) || folio_mapcount(folio) == 1) { One question to the page_mapcount -> folio_mapcount here. For a large folio with 0 entire mapcount, if the first sub-page and any other sub-page are mapped, page_mapcount(head) == 1 is true while folio_mapcount(folio) == 1 is not. Regards Yin, Fengwei > + if (!folio_isolate_lru(folio)) { > + list_add_tail(&folio->lru, foliolist); > + node_stat_mod_folio(folio, > + NR_ISOLATED_ANON + folio_is_file_lru(folio), > + folio_nr_pages(folio)); > } else if (flags & MPOL_MF_STRICT) { > /* > - * Non-movable page may reach here. And, there may be > - * temporary off LRU pages or non-LRU movable pages. > - * Treat them as unmovable pages since they can't be > + * Non-movable folio may reach here. And, there may be > + * temporary off LRU folios or non-LRU movable folios. > + * Treat them as unmovable folios since they can't be > * isolated, so they can't be moved at the moment. It > * should return -EIO for this case too. > */ > @@ -1234,7 +1230,7 @@ static struct page *new_page(struct page *page, unsigned long start) > } > #else > > -static int migrate_page_add(struct page *page, struct list_head *pagelist, > +static int migrate_folio_add(struct folio *folio, struct list_head *foliolist, > unsigned long flags) > { > return -EIO;