[PATCH] Use ZVC for free_pages

This is again simplifies some of the VM counter calculations through the use
of the ZVC consolidated counters.

[michal.k.k.piotrowski@gmail.com: build fix]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 9137d1b..824279c 100644 (file)
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -47,6 +47,7 @@ struct zone_padding {
 #endif
 
 enum zone_stat_item {
+       NR_FREE_PAGES,
        NR_INACTIVE,
        NR_ACTIVE,
        NR_ANON_PAGES,  /* Mapped anonymous pages */
@@ -157,7 +158,6 @@ enum zone_type {
 
 struct zone {
        /* Fields commonly accessed by the page allocator */
-       unsigned long           free_pages;
        unsigned long           pages_min, pages_low, pages_high;
        /*
         * We don't know if the memory that we're going to allocate will be freeable

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index c024606..fc53ad0 100644 (file)
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -591,7 +591,7 @@ static unsigned int count_free_highmem_pages(void)
 
        for_each_zone(zone)
                if (populated_zone(zone) && is_highmem(zone))
-                       cnt += zone->free_pages;
+                       cnt += zone_page_state(zone, NR_FREE_PAGES);
 
        return cnt;
 }
@@ -869,7 +869,7 @@ static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem)
        for_each_zone(zone) {
                meta += snapshot_additional_pages(zone);
                if (!is_highmem(zone))
-                       free += zone->free_pages;
+                       free += zone_page_state(zone, NR_FREE_PAGES);
        }
 
        nr_pages += count_pages_for_highmem(nr_highmem);

diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index 31aa039..7fb8343 100644 (file)
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -230,9 +230,10 @@ int swsusp_shrink_memory(void)
                for_each_zone (zone)
                        if (populated_zone(zone)) {
                                if (is_highmem(zone)) {
-                                       highmem_size -= zone->free_pages;
+                                       highmem_size -=
+                                       zone_page_state(zone, NR_FREE_PAGES);
                                } else {
-                                       tmp -= zone->free_pages;
+                                       tmp -= zone_page_state(zone, NR_FREE_PAGES);
                                        tmp += zone->lowmem_reserve[ZONE_NORMAL];
                                        tmp += snapshot_additional_pages(zone);
                                }

diff --git a/mm/highmem.c b/mm/highmem.c
index 0206e7e..51e1c19 100644 (file)
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -47,7 +47,8 @@ unsigned int nr_free_highpages (void)
        unsigned int pages = 0;
 
        for_each_online_pgdat(pgdat)
-               pages += pgdat->node_zones[ZONE_HIGHMEM].free_pages;
+               pages += zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
+                       NR_FREE_PAGES);
 
        return pages;
 }

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 07c954e..ba62d87 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -395,7 +395,7 @@ static inline void __free_one_page(struct page *page,
        VM_BUG_ON(page_idx & (order_size - 1));
        VM_BUG_ON(bad_range(zone, page));
 
-       zone->free_pages += order_size;
+       __mod_zone_page_state(zone, NR_FREE_PAGES, order_size);
        while (order < MAX_ORDER-1) {
                unsigned long combined_idx;
                struct free_area *area;
@@ -631,7 +631,7 @@ static struct page *__rmqueue(struct zone *zone, unsigned int order)
                list_del(&page->lru);
                rmv_page_order(page);
                area->nr_free--;
-               zone->free_pages -= 1UL << order;
+               __mod_zone_page_state(zone, NR_FREE_PAGES, - (1UL << order));
                expand(zone, page, order, current_order, area);
                return page;
        }
@@ -989,7 +989,8 @@ int zone_watermark_ok(struct zone *z, int order, unsigned long mark,
                      int classzone_idx, int alloc_flags)
 {
        /* free_pages my go negative - that's OK */
-       long min = mark, free_pages = z->free_pages - (1 << order) + 1;
+       long min = mark;
+       long free_pages = zone_page_state(z, NR_FREE_PAGES) - (1 << order) + 1;
        int o;
 
        if (alloc_flags & ALLOC_HIGH)
@@ -1444,13 +1445,7 @@ EXPORT_SYMBOL(free_pages);
  */
 unsigned int nr_free_pages(void)
 {
-       unsigned int sum = 0;
-       struct zone *zone;
-
-       for_each_zone(zone)
-               sum += zone->free_pages;
-
-       return sum;
+       return global_page_state(NR_FREE_PAGES);
 }
 
 EXPORT_SYMBOL(nr_free_pages);
@@ -1458,13 +1453,7 @@ EXPORT_SYMBOL(nr_free_pages);
 #ifdef CONFIG_NUMA
 unsigned int nr_free_pages_pgdat(pg_data_t *pgdat)
 {
-       unsigned int sum = 0;
-       enum zone_type i;
-
-       for (i = 0; i < MAX_NR_ZONES; i++)
-               sum += pgdat->node_zones[i].free_pages;
-
-       return sum;
+       return node_page_state(pgdat->node_id, NR_FREE_PAGES);
 }
 #endif
 
@@ -1514,7 +1503,7 @@ void si_meminfo(struct sysinfo *val)
 {
        val->totalram = totalram_pages;
        val->sharedram = 0;
-       val->freeram = nr_free_pages();
+       val->freeram = global_page_state(NR_FREE_PAGES);
        val->bufferram = nr_blockdev_pages();
        val->totalhigh = totalhigh_pages;
        val->freehigh = nr_free_highpages();
@@ -1529,10 +1518,11 @@ void si_meminfo_node(struct sysinfo *val, int nid)
        pg_data_t *pgdat = NODE_DATA(nid);
 
        val->totalram = pgdat->node_present_pages;
-       val->freeram = nr_free_pages_pgdat(pgdat);
+       val->freeram = node_page_state(nid, NR_FREE_PAGES);
 #ifdef CONFIG_HIGHMEM
        val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].present_pages;
-       val->freehigh = pgdat->node_zones[ZONE_HIGHMEM].free_pages;
+       val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
+                       NR_FREE_PAGES);
 #else
        val->totalhigh = 0;
        val->freehigh = 0;
@@ -1580,13 +1570,13 @@ void show_free_areas(void)
        get_zone_counts(&active, &inactive, &free);
 
        printk("Active:%lu inactive:%lu dirty:%lu writeback:%lu unstable:%lu\n"
-               " free:%u slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
+               " free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
                active,
                inactive,
                global_page_state(NR_FILE_DIRTY),
                global_page_state(NR_WRITEBACK),
                global_page_state(NR_UNSTABLE_NFS),
-               nr_free_pages(),
+               global_page_state(NR_FREE_PAGES),
                global_page_state(NR_SLAB_RECLAIMABLE) +
                        global_page_state(NR_SLAB_UNRECLAIMABLE),
                global_page_state(NR_FILE_MAPPED),
@@ -1612,7 +1602,7 @@ void show_free_areas(void)
                        " all_unreclaimable? %s"
                        "\n",
                        zone->name,
-                       K(zone->free_pages),
+                       K(zone_page_state(zone, NR_FREE_PAGES)),
                        K(zone->pages_min),
                        K(zone->pages_low),
                        K(zone->pages_high),
@@ -2675,7 +2665,6 @@ static void __meminit free_area_init_core(struct pglist_data *pgdat,
                spin_lock_init(&zone->lru_lock);
                zone_seqlock_init(zone);
                zone->zone_pgdat = pgdat;
-               zone->free_pages = 0;
 
                zone->prev_priority = DEF_PRIORITY;
 

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 5462106..2386716 100644 (file)
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -16,30 +16,17 @@
 void __get_zone_counts(unsigned long *active, unsigned long *inactive,
                        unsigned long *free, struct pglist_data *pgdat)
 {
-       struct zone *zones = pgdat->node_zones;
-       int i;
-
        *active = node_page_state(pgdat->node_id, NR_ACTIVE);
        *inactive = node_page_state(pgdat->node_id, NR_INACTIVE);
-       *free = 0;
-       for (i = 0; i < MAX_NR_ZONES; i++) {
-               *free += zones[i].free_pages;
-       }
+       *free = node_page_state(pgdat->node_id, NR_FREE_PAGES);
 }
 
 void get_zone_counts(unsigned long *active,
                unsigned long *inactive, unsigned long *free)
 {
-       struct pglist_data *pgdat;
-
        *active = global_page_state(NR_ACTIVE);
        *inactive = global_page_state(NR_INACTIVE);
-       *free = 0;
-       for_each_online_pgdat(pgdat) {
-               unsigned long l, m, n;
-               __get_zone_counts(&l, &m, &n, pgdat);
-               *free += n;
-       }
+       *free = global_page_state(NR_FREE_PAGES);
 }
 
 #ifdef CONFIG_VM_EVENT_COUNTERS
@@ -454,6 +441,7 @@ const struct seq_operations fragmentation_op = {
 
 static const char * const vmstat_text[] = {
        /* Zoned VM counters */
+       "nr_free_pages",
        "nr_active",
        "nr_inactive",
        "nr_anon_pages",
@@ -534,7 +522,7 @@ static int zoneinfo_show(struct seq_file *m, void *arg)
                           "\n        scanned  %lu (a: %lu i: %lu)"
                           "\n        spanned  %lu"
                           "\n        present  %lu",
-                          zone->free_pages,
+                          zone_page_state(zone, NR_FREE_PAGES),
                           zone->pages_min,
                           zone->pages_low,
                           zone->pages_high,