[PATCH v4 03/25] mm/vmstat: Add functions to account folio statistics

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Allow page counters to be more readily modified by callers which have
a folio.  Name these wrappers with 'stat' instead of 'state' as requested
by Linus here:
https://lore.kernel.org/linux-mm/CAHk-=wj847SudR-kt+46fT3+xFFgiwpgThvm7DJWGdi4cVrbnQ@mail.gmail.com/

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/linux/vmstat.h | 83 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 506d625163a1..dff5342df07b 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -402,6 +402,54 @@ static inline void drain_zonestat(struct zone *zone,
 			struct per_cpu_pageset *pset) { }
 #endif		/* CONFIG_SMP */
 
+static inline
+void __inc_zone_folio_stat(struct folio *folio, enum zone_stat_item item)
+{
+	__mod_zone_page_state(folio_zone(folio), item, folio_nr_pages(folio));
+}
+
+static inline
+void __dec_zone_folio_stat(struct folio *folio, enum zone_stat_item item)
+{
+	__mod_zone_page_state(folio_zone(folio), item, -folio_nr_pages(folio));
+}
+
+static inline
+void inc_zone_folio_stat(struct folio *folio, enum zone_stat_item item)
+{
+	mod_zone_page_state(folio_zone(folio), item, folio_nr_pages(folio));
+}
+
+static inline
+void dec_zone_folio_stat(struct folio *folio, enum zone_stat_item item)
+{
+	mod_zone_page_state(folio_zone(folio), item, -folio_nr_pages(folio));
+}
+
+static inline
+void __inc_node_folio_stat(struct folio *folio, enum node_stat_item item)
+{
+	__mod_node_page_state(folio_pgdat(folio), item, folio_nr_pages(folio));
+}
+
+static inline
+void __dec_node_folio_stat(struct folio *folio, enum node_stat_item item)
+{
+	__mod_node_page_state(folio_pgdat(folio), item, -folio_nr_pages(folio));
+}
+
+static inline
+void inc_node_folio_stat(struct folio *folio, enum node_stat_item item)
+{
+	mod_node_page_state(folio_pgdat(folio), item, folio_nr_pages(folio));
+}
+
+static inline
+void dec_node_folio_stat(struct folio *folio, enum node_stat_item item)
+{
+	mod_node_page_state(folio_pgdat(folio), item, -folio_nr_pages(folio));
+}
+
 static inline void __mod_zone_freepage_state(struct zone *zone, int nr_pages,
 					     int migratetype)
 {
@@ -536,6 +584,24 @@ static inline void __dec_lruvec_page_state(struct page *page,
 	__mod_lruvec_page_state(page, idx, -1);
 }
 
+static inline void __mod_lruvec_folio_stat(struct folio *folio,
+					   enum node_stat_item idx, int val)
+{
+	__mod_lruvec_page_state(&folio->page, idx, val);
+}
+
+static inline void __inc_lruvec_folio_stat(struct folio *folio,
+					   enum node_stat_item idx)
+{
+	__mod_lruvec_folio_stat(folio, idx, folio_nr_pages(folio));
+}
+
+static inline void __dec_lruvec_folio_stat(struct folio *folio,
+					   enum node_stat_item idx)
+{
+	__mod_lruvec_folio_stat(folio, idx, -folio_nr_pages(folio));
+}
+
 static inline void inc_lruvec_state(struct lruvec *lruvec,
 				    enum node_stat_item idx)
 {
@@ -560,4 +626,21 @@ static inline void dec_lruvec_page_state(struct page *page,
 	mod_lruvec_page_state(page, idx, -1);
 }
 
+static inline void mod_lruvec_folio_stat(struct folio *folio,
+					 enum node_stat_item idx, int val)
+{
+	mod_lruvec_page_state(&folio->page, idx, val);
+}
+
+static inline void inc_lruvec_folio_stat(struct folio *folio,
+					 enum node_stat_item idx)
+{
+	mod_lruvec_folio_stat(folio, idx, folio_nr_pages(folio));
+}
+
+static inline void dec_lruvec_folio_stat(struct folio *folio,
+					 enum node_stat_item idx)
+{
+	mod_lruvec_folio_stat(folio, idx, -folio_nr_pages(folio));
+}
 #endif /* _LINUX_VMSTAT_H */
-- 
2.30.0