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V3bqOmApLGfpnAxQOQnTitpchO5EoX/ywpPBhv4+i8a3h9Qcf8Ckq/7P/qrHy/rVRhf1/NZgVs6fOk7sypsGEfpHbW6DVMJY25WzlDKY7QAvctRUU8tLaqwMdtCc4ciKPe0FrScKLVsPa3Fk0FrKqb6uhWT26HHy+VlpXQzHlpTCG8uVUcK3TAH+hTaYqRVIs5DAhaGOjfF3+kaLrf1OlIjO/x9O0bJJ1HgZfFXcNuAD+yJycRs+dOYlED7sGT0yJNDA0ddtLEJl1GfkzqEh6gZIg6NUkog/c4iVMKvO7GzfF5685+UDX90lYfiYYUkcXYKhrF9ouq8ctIqi8feeMfqHz46MoMYaHRCO0Xt90wbtw8ATpFpEoqKa4umPDgKIEOg7stBqFOu0tC5A8ZcrrtUcmzjOXuROupXp4xF0sWhhQF0iYWIjJ+QeRsyUOaDbnen8s6JHqLnLXSE399DRmSzUCng== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 1/31/2023 4:18 AM, Vishal Moola (Oracle) wrote: > Replace migrate_page_add() with migrate_folio_add(). migrate_folio_add() > does the same a migrate_page_add() but takes in a folio instead of a page. > This removes a couple of calls to compound_head(). > > Signed-off-by: Vishal Moola (Oracle) Reviewed-by: Yin Fengwei Regards Yin, Fengwei > --- > mm/mempolicy.c | 39 ++++++++++++++++++++------------------- > 1 file changed, 20 insertions(+), 19 deletions(-) > > diff --git a/mm/mempolicy.c b/mm/mempolicy.c > index 6a68dbce3b70..0919c7a719d4 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; > @@ -1021,27 +1021,28 @@ 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. > + * We try to migrate only unshared folios. If it is shared it > + * is likely not worth migrating. > + * > + * To check if the folio is shared, ideally we want to make sure > + * every page is mapped to the same process. Doing that is very > + * expensive, so check the estimated mapcount of the folio instead. > */ > - 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_estimated_sharers(folio) == 1) { > + 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. > */ > @@ -1235,7 +1236,7 @@ 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;