[12/17] Variable Page Cache Size: Fix up reclaim counters

[clameter]

We can now reclaim larger pages. Adjust the VM counters to deal with it.

Signed-off-by: Christoph Lameter <clameter@xxxxxxx>

---
 mm/vmscan.c |   15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

Index: linux-2.6.21-rc7/mm/vmscan.c
===================================================================
--- linux-2.6.21-rc7.orig/mm/vmscan.c	2007-04-23 22:15:30.000000000 -0700
+++ linux-2.6.21-rc7/mm/vmscan.c	2007-04-23 22:19:21.000000000 -0700
@@ -471,14 +471,14 @@ static unsigned long shrink_page_list(st
 
 		VM_BUG_ON(PageActive(page));
 
-		sc->nr_scanned++;
+		sc->nr_scanned += compound_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 += compound_pages(page);
 
 		if (PageWriteback(page))
 			goto keep_locked;
@@ -581,7 +581,7 @@ static unsigned long shrink_page_list(st
 
 free_it:
 		unlock_page(page);
-		nr_reclaimed++;
+		nr_reclaimed += compound_pages(page);
 		if (!pagevec_add(&freed_pvec, page))
 			__pagevec_release_nonlru(&freed_pvec);
 		continue;
@@ -627,7 +627,7 @@ static unsigned long isolate_lru_pages(u
 	struct page *page;
 	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 list_head *target;
 		page = lru_to_page(src);
 		prefetchw_prev_lru_page(page, src, flags);
@@ -644,10 +644,11 @@ static unsigned long isolate_lru_pages(u
 			 */
 			ClearPageLRU(page);
 			target = dst;
-			nr_taken++;
+			nr_taken += compound_pages(page);
 		} /* else it is being freed elsewhere */
 
 		list_add(&page->lru, target);
+		scan += compound_pages(page);
 	}
 
 	*scanned = scan;
@@ -856,7 +857,7 @@ force_reclaim_mapped:
 		ClearPageActive(page);
 
 		list_move(&page->lru, &zone->inactive_list);
-		pgmoved++;
+		pgmoved += compound_pages(page);
 		if (!pagevec_add(&pvec, page)) {
 			__mod_zone_page_state(zone, NR_INACTIVE, pgmoved);
 			spin_unlock_irq(&zone->lru_lock);
@@ -884,7 +885,7 @@ force_reclaim_mapped:
 		SetPageLRU(page);
 		VM_BUG_ON(!PageActive(page));
 		list_move(&page->lru, &zone->active_list);
-		pgmoved++;
+		pgmoved += compound_pages(page);
 		if (!pagevec_add(&pvec, page)) {
 			__mod_zone_page_state(zone, NR_ACTIVE, pgmoved);
 			pgmoved = 0;

--
-
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