[PATCH 4/7] unevictable lru: add event counts to list scan

[Lee Schermerhorn <lee.schermerhorn@hp.com>]

Fix to shm_locked-pages-are-unevictable.patch

More breaking up of the single unevictable lru/mlocked pages
vm events patch.

Add the vm events counting to the unevictable lru list
scanning for shm_unlock().

Signed-off-by:  Lee Schermerhorn <lee.schermerhorn@hp.com>

 mm/vmscan.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-2.6.27-rc1-mmotm-30jul/mm/vmscan.c
===================================================================
--- linux-2.6.27-rc1-mmotm-30jul.orig/mm/vmscan.c	2008-07-30 13:26:46.000000000 -0400
+++ linux-2.6.27-rc1-mmotm-30jul/mm/vmscan.c	2008-07-30 13:34:58.000000000 -0400
@@ -2407,6 +2407,7 @@ retry:
 		__dec_zone_state(zone, NR_UNEVICTABLE);
 		list_move(&page->lru, &zone->lru[l].list);
 		__inc_zone_state(zone, NR_INACTIVE_ANON + l);
+		__count_vm_event(UNEVICTABLE_PGRESCUED);
 	} else {
 		/*
 		 * rotate unevictable list
@@ -2440,6 +2441,7 @@ void scan_mapping_unevictable_pages(stru
 	while (next < end &&
 		pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
 		int i;
+		int pg_scanned = 0;
 
 		zone = NULL;
 
@@ -2448,6 +2450,7 @@ void scan_mapping_unevictable_pages(stru
 			pgoff_t page_index = page->index;
 			struct zone *pagezone = page_zone(page);
 
+			pg_scanned++;
 			if (page_index > next)
 				next = page_index;
 			next++;
@@ -2465,6 +2468,8 @@ void scan_mapping_unevictable_pages(stru
 		if (zone)
 			spin_unlock_irq(&zone->lru_lock);
 		pagevec_release(&pvec);
+
+		count_vm_events(UNEVICTABLE_PGSCANNED, pg_scanned);
 	}
 
 }

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