diff mbox series

[1/6] mm/page_alloc: Add page->buddy_list and page->pcp_list

Message ID 20220512085043.5234-2-mgorman@techsingularity.net (mailing list archive)
State New
Headers show
Series Drain remote per-cpu directly v3 | expand

Commit Message

Mel Gorman May 12, 2022, 8:50 a.m. UTC 
The page allocator uses page->lru for storing pages on either buddy or
PCP lists. Create page->buddy_list and page->pcp_list as a union with
page->lru. This is simply to clarify what type of list a page is on
in the page allocator.

No functional change intended.

[minchan: Fix page lru fields in macros]
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Tested-by: Minchan Kim <minchan@kernel.org>
Acked-by: Minchan Kim <minchan@kernel.org>
---
 include/linux/mm_types.h |  5 +++++
 mm/page_alloc.c          | 24 ++++++++++++------------
 2 files changed, 17 insertions(+), 12 deletions(-)

Comments

Nicolas Saenz Julienne May 13, 2022, 11:59 a.m. UTC | #1 
On Thu, 2022-05-12 at 09:50 +0100, Mel Gorman wrote:
> The page allocator uses page->lru for storing pages on either buddy
> or
> PCP lists. Create page->buddy_list and page->pcp_list as a union with
> page->lru. This is simply to clarify what type of list a page is on
> in the page allocator.
> 
> No functional change intended.
> 
> [minchan: Fix page lru fields in macros]
> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
> Tested-by: Minchan Kim <minchan@kernel.org>
> Acked-by: Minchan Kim <minchan@kernel.org>
> ---

Reviewed-by: Nicolas Saenz Julienne <nsaenzju@redhat.com>

Thanks,
Vlastimil Babka May 19, 2022, 9:36 a.m. UTC | #2 
On 5/12/22 10:50, Mel Gorman wrote:
> The page allocator uses page->lru for storing pages on either buddy or
> PCP lists. Create page->buddy_list and page->pcp_list as a union with
> page->lru. This is simply to clarify what type of list a page is on
> in the page allocator.
> 
> No functional change intended.
> 
> [minchan: Fix page lru fields in macros]
> Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
> Tested-by: Minchan Kim <minchan@kernel.org>
> Acked-by: Minchan Kim <minchan@kernel.org>

Acked-by: Vlastimil Babka <vbabka@suse.cz>
diff mbox series

Patch

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 8834e38c06a4..a2782e8af307 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -87,6 +87,7 @@  struct page {
 			 */
 			union {
 				struct list_head lru;
+
 				/* Or, for the Unevictable "LRU list" slot */
 				struct {
 					/* Always even, to negate PageTail */
@@ -94,6 +95,10 @@  struct page {
 					/* Count page's or folio's mlocks */
 					unsigned int mlock_count;
 				};
+
+				/* Or, free page */
+				struct list_head buddy_list;
+				struct list_head pcp_list;
 			};
 			/* See page-flags.h for PAGE_MAPPING_FLAGS */
 			struct address_space *mapping;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2db95780e003..f58f85fdb05f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -780,7 +780,7 @@  static inline bool set_page_guard(struct zone *zone, struct page *page,
 		return false;
 
 	__SetPageGuard(page);
-	INIT_LIST_HEAD(&page->lru);
+	INIT_LIST_HEAD(&page->buddy_list);
 	set_page_private(page, order);
 	/* Guard pages are not available for any usage */
 	__mod_zone_freepage_state(zone, -(1 << order), migratetype);
@@ -957,7 +957,7 @@  static inline void add_to_free_list(struct page *page, struct zone *zone,
 {
 	struct free_area *area = &zone->free_area[order];
 
-	list_add(&page->lru, &area->free_list[migratetype]);
+	list_add(&page->buddy_list, &area->free_list[migratetype]);
 	area->nr_free++;
 }
 
@@ -967,7 +967,7 @@  static inline void add_to_free_list_tail(struct page *page, struct zone *zone,
 {
 	struct free_area *area = &zone->free_area[order];
 
-	list_add_tail(&page->lru, &area->free_list[migratetype]);
+	list_add_tail(&page->buddy_list, &area->free_list[migratetype]);
 	area->nr_free++;
 }
 
@@ -981,7 +981,7 @@  static inline void move_to_free_list(struct page *page, struct zone *zone,
 {
 	struct free_area *area = &zone->free_area[order];
 
-	list_move_tail(&page->lru, &area->free_list[migratetype]);
+	list_move_tail(&page->buddy_list, &area->free_list[migratetype]);
 }
 
 static inline void del_page_from_free_list(struct page *page, struct zone *zone,
@@ -991,7 +991,7 @@  static inline void del_page_from_free_list(struct page *page, struct zone *zone,
 	if (page_reported(page))
 		__ClearPageReported(page);
 
-	list_del(&page->lru);
+	list_del(&page->buddy_list);
 	__ClearPageBuddy(page);
 	set_page_private(page, 0);
 	zone->free_area[order].nr_free--;
@@ -1489,11 +1489,11 @@  static void free_pcppages_bulk(struct zone *zone, int count,
 		do {
 			int mt;
 
-			page = list_last_entry(list, struct page, lru);
+			page = list_last_entry(list, struct page, pcp_list);
 			mt = get_pcppage_migratetype(page);
 
 			/* must delete to avoid corrupting pcp list */
-			list_del(&page->lru);
+			list_del(&page->pcp_list);
 			count -= nr_pages;
 			pcp->count -= nr_pages;
 
@@ -3053,7 +3053,7 @@  static int rmqueue_bulk(struct zone *zone, unsigned int order,
 		 * for IO devices that can merge IO requests if the physical
 		 * pages are ordered properly.
 		 */
-		list_add_tail(&page->lru, list);
+		list_add_tail(&page->pcp_list, list);
 		allocated++;
 		if (is_migrate_cma(get_pcppage_migratetype(page)))
 			__mod_zone_page_state(zone, NR_FREE_CMA_PAGES,
@@ -3303,7 +3303,7 @@  void mark_free_pages(struct zone *zone)
 
 	for_each_migratetype_order(order, t) {
 		list_for_each_entry(page,
-				&zone->free_area[order].free_list[t], lru) {
+				&zone->free_area[order].free_list[t], buddy_list) {
 			unsigned long i;
 
 			pfn = page_to_pfn(page);
@@ -3392,7 +3392,7 @@  static void free_unref_page_commit(struct page *page, int migratetype,
 	__count_vm_event(PGFREE);
 	pcp = this_cpu_ptr(zone->per_cpu_pageset);
 	pindex = order_to_pindex(migratetype, order);
-	list_add(&page->lru, &pcp->lists[pindex]);
+	list_add(&page->pcp_list, &pcp->lists[pindex]);
 	pcp->count += 1 << order;
 
 	/*
@@ -3655,8 +3655,8 @@  struct page *__rmqueue_pcplist(struct zone *zone, unsigned int order,
 				return NULL;
 		}
 
-		page = list_first_entry(list, struct page, lru);
-		list_del(&page->lru);
+		page = list_first_entry(list, struct page, pcp_list);
+		list_del(&page->pcp_list);
 		pcp->count -= 1 << order;
 	} while (check_new_pcp(page, order));