[29/41] Fix up reclaim counters

[Christoph Lameter <clameter@sgi.com>]

Compound pages of an arbitrary order may now be on the LRU and may be
reclaimed.

Adjust the counting in vmscan.c to could the number of base pages.

Also change the active and inactive accounting to do the same.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
---
 include/linux/mm_inline.h |   36 +++++++++++++++++++++++++++---------
 mm/vmscan.c               |   22 ++++++++++++----------
 2 files changed, 39 insertions(+), 19 deletions(-)

diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index 895bc4e..5bf34aa 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -2,39 +2,57 @@ static inline void
 add_page_to_active_list(struct zone *zone, struct page *page)
 {
 	list_add(&page->lru, &zone->active_list);
-	__inc_zone_state(zone, NR_ACTIVE);
+	if (!PageHead(page))
+		__inc_zone_state(zone, NR_ACTIVE);
+	else
+		__inc_zone_page_state(page, NR_ACTIVE);
 }
 
 static inline void
 add_page_to_inactive_list(struct zone *zone, struct page *page)
 {
 	list_add(&page->lru, &zone->inactive_list);
-	__inc_zone_state(zone, NR_INACTIVE);
+	if (!PageHead(page))
+		__inc_zone_state(zone, NR_INACTIVE);
+	else
+		__inc_zone_page_state(page, NR_INACTIVE);
 }
 
 static inline void
 del_page_from_active_list(struct zone *zone, struct page *page)
 {
 	list_del(&page->lru);
-	__dec_zone_state(zone, NR_ACTIVE);
+	if (!PageHead(page))
+		__dec_zone_state(zone, NR_ACTIVE);
+	else
+		__dec_zone_page_state(page, NR_ACTIVE);
 }
 
 static inline void
 del_page_from_inactive_list(struct zone *zone, struct page *page)
 {
 	list_del(&page->lru);
-	__dec_zone_state(zone, NR_INACTIVE);
+	if (!PageHead(page))
+		__dec_zone_state(zone, NR_INACTIVE);
+	else
+		__dec_zone_page_state(page, NR_INACTIVE);
 }
 
 static inline void
 del_page_from_lru(struct zone *zone, struct page *page)
 {
+	enum zone_stat_item counter = NR_ACTIVE;
+
 	list_del(&page->lru);
-	if (PageActive(page)) {
+	if (PageActive(page))
 		__ClearPageActive(page);
-		__dec_zone_state(zone, NR_ACTIVE);
-	} else {
-		__dec_zone_state(zone, NR_INACTIVE);
-	}
+	else
+		counter = NR_INACTIVE;
+
+	if (!PageHead(page))
+		__dec_zone_state(zone, counter);
+	else
+		__dec_zone_page_state(page, counter);
 }
 
+
diff --git a/mm/vmscan.c b/mm/vmscan.c
index a6e65d0..79a6800 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -466,14 +466,14 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 
 		VM_BUG_ON(PageActive(page));
 
-		sc->nr_scanned++;
+		sc->nr_scanned += page_cache_base_pages(page);
 
 		if (!sc->may_swap && page_mapped(page))
 			goto keep_locked;
 
 		/* Double the slab pressure for mapped and swapcache pages */
 		if (page_mapped(page) || PageSwapCache(page))
-			sc->nr_scanned++;
+			sc->nr_scanned += page_cache_base_pages(page);
 
 		may_enter_fs = (sc->gfp_mask & __GFP_FS) ||
 			(PageSwapCache(page) && (sc->gfp_mask & __GFP_IO));
@@ -590,7 +590,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 
 free_it:
 		unlock_page(page);
-		nr_reclaimed++;
+		nr_reclaimed += page_cache_base_pages(page);
 		if (!pagevec_add(&freed_pvec, page))
 			__pagevec_release_nonlru(&freed_pvec);
 		continue;
@@ -682,22 +682,23 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 	unsigned long nr_taken = 0;
 	unsigned long scan;
 
-	for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
+	for (scan = 0; scan < nr_to_scan && !list_empty(src); ) {
 		struct page *page;
 		unsigned long pfn;
 		unsigned long end_pfn;
 		unsigned long page_pfn;
+		int pages;
 		int zone_id;
 
 		page = lru_to_page(src);
 		prefetchw_prev_lru_page(page, src, flags);
-
+		pages = page_cache_base_pages(page);
 		VM_BUG_ON(!PageLRU(page));
 
 		switch (__isolate_lru_page(page, mode)) {
 		case 0:
 			list_move(&page->lru, dst);
-			nr_taken++;
+			nr_taken += pages;
 			break;
 
 		case -EBUSY:
@@ -743,8 +744,8 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 			switch (__isolate_lru_page(cursor_page, mode)) {
 			case 0:
 				list_move(&cursor_page->lru, dst);
-				nr_taken++;
-				scan++;
+				nr_taken += page_cache_base_pages(cursor_page);
+				scan += page_cache_base_pages(cursor_page);
 				break;
 
 			case -EBUSY:
@@ -754,6 +755,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 				break;
 			}
 		}
+		scan += pages;
 	}
 
 	*scanned = scan;
@@ -1010,7 +1012,7 @@ force_reclaim_mapped:
 		ClearPageActive(page);
 
 		list_move(&page->lru, &zone->inactive_list);
-		pgmoved++;
+		pgmoved += page_cache_base_pages(page);
 		if (!pagevec_add(&pvec, page)) {
 			__mod_zone_page_state(zone, NR_INACTIVE, pgmoved);
 			spin_unlock_irq(&zone->lru_lock);
@@ -1038,7 +1040,7 @@ force_reclaim_mapped:
 		SetPageLRU(page);
 		VM_BUG_ON(!PageActive(page));
 		list_move(&page->lru, &zone->active_list);
-		pgmoved++;
+		pgmoved += page_cache_base_pages(page);
 		if (!pagevec_add(&pvec, page)) {
 			__mod_zone_page_state(zone, NR_ACTIVE, pgmoved);
 			pgmoved = 0;
-- 
1.5.2.5

-- 
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