mm/memcg: Convert mem_cgroup_migrate() to take folios

Convert all callers of mem_cgroup_migrate() to call page_folio() first.
They all look like they're using head pages already, but this proves it.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index b4bc052..07eda24 100644 (file)
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -745,7 +745,7 @@ static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
        __mem_cgroup_uncharge_list(page_list);
 }
 
-void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
+void mem_cgroup_migrate(struct folio *old, struct folio *new);
 
 /**
  * mem_cgroup_lruvec - get the lru list vector for a memcg & node
@@ -1244,7 +1244,7 @@ static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
 {
 }
 
-static inline void mem_cgroup_migrate(struct page *old, struct page *new)
+static inline void mem_cgroup_migrate(struct folio *old, struct folio *new)
 {
 }
 

diff --git a/mm/filemap.c b/mm/filemap.c
index 44fcd9d..5368a4d 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -835,6 +835,8 @@ EXPORT_SYMBOL(file_write_and_wait_range);
  */
 void replace_page_cache_page(struct page *old, struct page *new)
 {
+       struct folio *fold = page_folio(old);
+       struct folio *fnew = page_folio(new);
        struct address_space *mapping = old->mapping;
        void (*freepage)(struct page *) = mapping->a_ops->freepage;
        pgoff_t offset = old->index;
@@ -848,7 +850,7 @@ void replace_page_cache_page(struct page *old, struct page *new)
        new->mapping = mapping;
        new->index = offset;
 
-       mem_cgroup_migrate(old, new);
+       mem_cgroup_migrate(fold, fnew);
 
        xas_lock_irq(&xas);
        xas_store(&xas, new);

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6321ed6..c83d2f8 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6891,36 +6891,35 @@ void __mem_cgroup_uncharge_list(struct list_head *page_list)
 }
 
 /**
- * mem_cgroup_migrate - charge a page's replacement
- * @oldpage: currently circulating page
- * @newpage: replacement page
+ * mem_cgroup_migrate - Charge a folio's replacement.
+ * @old: Currently circulating folio.
+ * @new: Replacement folio.
  *
- * Charge @newpage as a replacement page for @oldpage. @oldpage will
+ * Charge @new as a replacement folio for @old. @old will
  * be uncharged upon free.
  *
- * Both pages must be locked, @newpage->mapping must be set up.
+ * Both folios must be locked, @new->mapping must be set up.
  */
-void mem_cgroup_migrate(struct page *oldpage, struct page *newpage)
+void mem_cgroup_migrate(struct folio *old, struct folio *new)
 {
-       struct folio *newfolio = page_folio(newpage);
        struct mem_cgroup *memcg;
-       long nr_pages = folio_nr_pages(newfolio);
+       long nr_pages = folio_nr_pages(new);
        unsigned long flags;
 
-       VM_BUG_ON_PAGE(!PageLocked(oldpage), oldpage);
-       VM_BUG_ON_FOLIO(!folio_test_locked(newfolio), newfolio);
-       VM_BUG_ON_FOLIO(PageAnon(oldpage) != folio_test_anon(newfolio), newfolio);
-       VM_BUG_ON_FOLIO(compound_nr(oldpage) != nr_pages, newfolio);
+       VM_BUG_ON_FOLIO(!folio_test_locked(old), old);
+       VM_BUG_ON_FOLIO(!folio_test_locked(new), new);
+       VM_BUG_ON_FOLIO(folio_test_anon(old) != folio_test_anon(new), new);
+       VM_BUG_ON_FOLIO(folio_nr_pages(old) != nr_pages, new);
 
        if (mem_cgroup_disabled())
                return;
 
-       /* Page cache replacement: new page already charged? */
-       if (folio_memcg(newfolio))
+       /* Page cache replacement: new folio already charged? */
+       if (folio_memcg(new))
                return;
 
-       memcg = page_memcg(oldpage);
-       VM_WARN_ON_ONCE_PAGE(!memcg, oldpage);
+       memcg = folio_memcg(old);
+       VM_WARN_ON_ONCE_FOLIO(!memcg, old);
        if (!memcg)
                return;
 
@@ -6932,11 +6931,11 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage)
        }
 
        css_get(&memcg->css);
-       commit_charge(newfolio, memcg);
+       commit_charge(new, memcg);
 
        local_irq_save(flags);
        mem_cgroup_charge_statistics(memcg, nr_pages);
-       memcg_check_events(memcg, page_to_nid(newpage));
+       memcg_check_events(memcg, folio_nid(new));
        local_irq_restore(flags);
 }
 

diff --git a/mm/migrate.c b/mm/migrate.c
index da55d2a..bfb8ba4 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -542,6 +542,8 @@ int migrate_huge_page_move_mapping(struct address_space *mapping,
  */
 void migrate_page_states(struct page *newpage, struct page *page)
 {
+       struct folio *folio = page_folio(page);
+       struct folio *newfolio = page_folio(newpage);
        int cpupid;
 
        if (PageError(page))
@@ -609,7 +611,7 @@ void migrate_page_states(struct page *newpage, struct page *page)
        copy_page_owner(page, newpage);
 
        if (!PageHuge(page))
-               mem_cgroup_migrate(page, newpage);
+               mem_cgroup_migrate(folio, newfolio);
 }
 EXPORT_SYMBOL(migrate_page_states);
 

diff --git a/mm/shmem.c b/mm/shmem.c
index a2e653a..1588f33 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1637,6 +1637,7 @@ static int shmem_replace_page(struct page **pagep, gfp_t gfp,
                                struct shmem_inode_info *info, pgoff_t index)
 {
        struct page *oldpage, *newpage;
+       struct folio *old, *new;
        struct address_space *swap_mapping;
        swp_entry_t entry;
        pgoff_t swap_index;
@@ -1673,7 +1674,9 @@ static int shmem_replace_page(struct page **pagep, gfp_t gfp,
        xa_lock_irq(&swap_mapping->i_pages);
        error = shmem_replace_entry(swap_mapping, swap_index, oldpage, newpage);
        if (!error) {
-               mem_cgroup_migrate(oldpage, newpage);
+               old = page_folio(oldpage);
+               new = page_folio(newpage);
+               mem_cgroup_migrate(old, new);
                __inc_lruvec_page_state(newpage, NR_FILE_PAGES);
                __dec_lruvec_page_state(oldpage, NR_FILE_PAGES);
        }