proc: export mlocked pages info through "/proc/meminfo: Wired"

diff -urN linux-2.6.15.orig/fs/proc/proc_misc.c linux-2.6.15/fs/proc/proc_misc.c
@@ -123,6 +123,7 @@
 	struct page_state ps;
 	unsigned long inactive;
 	unsigned long active;
+	unsigned long wired;
 	unsigned long free;
 	unsigned long committed;
 	unsigned long allowed;

@@ -130,7 +131,7 @@
 	long cached;
 
 	get_page_state(&ps);
-	get_zone_counts(&active, &inactive, &free);
+	get_zone_counts(&active, &inactive, &wired, &free);
 
 /*
  * display in kilobytes.

@@ -159,6 +160,7 @@
 		"SwapCached:   %8lu kB\n"
 		"Active:       %8lu kB\n"
 		"Inactive:     %8lu kB\n"
+		"Wired:        %8lu kB\n"
 		"HighTotal:    %8lu kB\n"
 		"HighFree:     %8lu kB\n"
 		"LowTotal:     %8lu kB\n"

@@ -182,6 +184,7 @@
 		K(total_swapcache_pages),
 		K(active),
 		K(inactive),
+		K(wired),
 		K(i.totalhigh),
 		K(i.freehigh),
 		K(i.totalram-i.totalhigh),

@@ -315,9 +317,9 @@
 extern struct pglist_data *pgdat_list;
 
 void __get_zone_counts(unsigned long *active, unsigned long *inactive,
-			unsigned long *free, struct pglist_data *pgdat);
+		unsigned long *wired, unsigned long *free, struct pglist_data *pgdat);
 void get_zone_counts(unsigned long *active, unsigned long *inactive,
-			unsigned long *free);
+		unsigned long *wired, unsigned long *free);
 void build_all_zonelists(void);
 void wakeup_kswapd(struct zone *zone, int order);
 int zone_watermark_ok(struct zone *z, int order, unsigned long mark,

diff -urN linux-2.6.15.orig/mm/page_alloc.c linux-2.6.15/mm/page_alloc.c
@@ -1252,35 +1254,39 @@
 EXPORT_SYMBOL(__mod_page_state);
 
 void __get_zone_counts(unsigned long *active, unsigned long *inactive,
-			unsigned long *free, struct pglist_data *pgdat)
+			unsigned long *wired,unsigned long *free, struct pglist_data *pgdat)
 {
 	struct zone *zones = pgdat->node_zones;
 	int i;
 
 	*active = 0;
 	*inactive = 0;
+	*wired = 0;
 	*free = 0;
 	for (i = 0; i < MAX_NR_ZONES; i++) {
 		*active += zones[i].nr_active;
 		*inactive += zones[i].nr_inactive;
+		*wired += zones[i].nr_wired;
 		*free += zones[i].free_pages;
 	}
 }
 
 void get_zone_counts(unsigned long *active,
-		unsigned long *inactive, unsigned long *free)
+		unsigned long *inactive, unsigned long *wired, unsigned long *free)
 {
 	struct pglist_data *pgdat;
 
 	*active = 0;
 	*inactive = 0;
+	*wired = 0;
 	*free = 0;
 	for_each_pgdat(pgdat) {
-		unsigned long l, m, n;
-		__get_zone_counts(&l, &m, &n, pgdat);
+		unsigned long l, m, n, o;
+		__get_zone_counts(&l, &m, &n, &o, pgdat);
 		*active += l;
 		*inactive += m;
-		*free += n;
+		*wired += n;
+		*free += o;
 	}
 }
 

@@ -1328,6 +1334,7 @@
 	int cpu, temperature;
 	unsigned long active;
 	unsigned long inactive;
+	unsigned long wired;
 	unsigned long free;
 	struct zone *zone;
 

@@ -1358,16 +1365,17 @@
 	}
 
 	get_page_state(&ps);
-	get_zone_counts(&active, &inactive, &free);
+	get_zone_counts(&active, &inactive, &wired, &free);
 
 	printk("Free pages: %11ukB (%ukB HighMem)\n",
 		K(nr_free_pages()),
 		K(nr_free_highpages()));
 
-	printk("Active:%lu inactive:%lu dirty:%lu writeback:%lu "
+	printk("Active:%lu inactive:%lu wired:%lu dirty:%lu writeback:%lu "
 		"unstable:%lu free:%u slab:%lu mapped:%lu pagetables:%lu\n",
 		active,
 		inactive,
+		wired,
 		ps.nr_dirty,
 		ps.nr_writeback,
 		ps.nr_unstable,

@@ -1387,6 +1395,7 @@
 			" high:%lukB"
 			" active:%lukB"
 			" inactive:%lukB"
+			" wired:%lukB"
 			" present:%lukB"
 			" pages_scanned:%lu"
 			" all_unreclaimable? %s"

@@ -1398,6 +1407,7 @@
 			K(zone->pages_high),
 			K(zone->nr_active),
 			K(zone->nr_inactive),
+			K(zone->nr_wired),
 			K(zone->present_pages),
 			zone->pages_scanned,
 			(zone->all_unreclaimable ? "yes" : "no")

@@ -2009,10 +2019,12 @@
 		zone_pcp_init(zone);
 		INIT_LIST_HEAD(&zone->active_list);
 		INIT_LIST_HEAD(&zone->inactive_list);
+		INIT_LIST_HEAD(&zone->wired_list);
 		zone->nr_scan_active = 0;
 		zone->nr_scan_inactive = 0;
 		zone->nr_active = 0;
 		zone->nr_inactive = 0;
+		zone->nr_wired = 0;
 		atomic_set(&zone->reclaim_in_progress, 0);
 		if (!size)
 			continue;

@@ -2161,6 +2173,7 @@
 			   "\n        high     %lu"
 			   "\n        active   %lu"
 			   "\n        inactive %lu"
+			   "\n        wired    %lu"
 			   "\n        scanned  %lu (a: %lu i: %lu)"
 			   "\n        spanned  %lu"
 			   "\n        present  %lu",

@@ -2170,6 +2183,7 @@
 			   zone->pages_high,
 			   zone->nr_active,
 			   zone->nr_inactive,
+			   zone->nr_wired,
 			   zone->pages_scanned,
 			   zone->nr_scan_active, zone->nr_scan_inactive,
 			   zone->spanned_pages,

diff -urN linux-2.6.15.orig/include/linux/mm.h linux-2.6.15/include/linux/mm.h
@@ -218,6 +221,10 @@
 	unsigned long flags;		/* Atomic flags, some possibly
 					 * updated asynchronously */
 	atomic_t _count;		/* Usage count, see below. */
+	unsigned short wired_count; /* Count of wirings of the page.
+					 * If not zero,the page would be SetPageWired,
+					 * and put on Wired list of the zone.
+					 */
 	atomic_t _mapcount;		/* Count of ptes mapped in mms,
 					 * to show when page is mapped
 					 * & limit reverse map searches.

diff -urN linux-2.6.15.orig/mm/readahead.c linux-2.6.15/mm/readahead.c
@@ -564,8 +564,9 @@
 {
 	unsigned long active;
 	unsigned long inactive;
+	unsigned long wired;
 	unsigned long free;
 
-	__get_zone_counts(&active, &inactive, &free, NODE_DATA(numa_node_id()));
+	__get_zone_counts(&active, &inactive, &wired, &free,