mm: use zone->present_pages instead of zone->managed_pages where appropriate

Now we have zone->managed_pages for "pages managed by the buddy system
in the zone", so replace zone->present_pages with zone->managed_pages if
what the user really wants is number of allocatable pages.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: Maciej Rutecki <maciej.rutecki@gmail.com>
Cc: Chris Clayton <chris2553@googlemail.com>
Cc: "Rafael J . Wysocki" <rjw@sisk.pl>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Minchan Kim <minchan@kernel.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Jianguo Wu <wujianguo@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a7381be..5f73106 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2808,7 +2808,7 @@ static unsigned int nr_free_zone_pages(int offset)
        struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL);
 
        for_each_zone_zonelist(zone, z, zonelist, offset) {
-               unsigned long size = zone->present_pages;
+               unsigned long size = zone->managed_pages;
                unsigned long high = high_wmark_pages(zone);
                if (size > high)
                        sum += size - high;
@@ -2861,7 +2861,7 @@ void si_meminfo_node(struct sysinfo *val, int nid)
        val->totalram = pgdat->node_present_pages;
        val->freeram = node_page_state(nid, NR_FREE_PAGES);
 #ifdef CONFIG_HIGHMEM
-       val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].present_pages;
+       val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages;
        val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM],
                        NR_FREE_PAGES);
 #else
@@ -3939,7 +3939,7 @@ static int __meminit zone_batchsize(struct zone *zone)
         *
         * OK, so we don't know how big the cache is.  So guess.
         */
-       batch = zone->present_pages / 1024;
+       batch = zone->managed_pages / 1024;
        if (batch * PAGE_SIZE > 512 * 1024)
                batch = (512 * 1024) / PAGE_SIZE;
        batch /= 4;             /* We effectively *= 4 below */
@@ -4023,7 +4023,7 @@ static void __meminit setup_zone_pageset(struct zone *zone)
 
                if (percpu_pagelist_fraction)
                        setup_pagelist_highmark(pcp,
-                               (zone->present_pages /
+                               (zone->managed_pages /
                                        percpu_pagelist_fraction));
        }
 }
@@ -5435,8 +5435,8 @@ static void calculate_totalreserve_pages(void)
                        /* we treat the high watermark as reserved pages. */
                        max += high_wmark_pages(zone);
 
-                       if (max > zone->present_pages)
-                               max = zone->present_pages;
+                       if (max > zone->managed_pages)
+                               max = zone->managed_pages;
                        reserve_pages += max;
                        /*
                         * Lowmem reserves are not available to
@@ -5468,7 +5468,7 @@ static void setup_per_zone_lowmem_reserve(void)
        for_each_online_pgdat(pgdat) {
                for (j = 0; j < MAX_NR_ZONES; j++) {
                        struct zone *zone = pgdat->node_zones + j;
-                       unsigned long present_pages = zone->present_pages;
+                       unsigned long managed_pages = zone->managed_pages;
 
                        zone->lowmem_reserve[j] = 0;
 
@@ -5482,9 +5482,9 @@ static void setup_per_zone_lowmem_reserve(void)
                                        sysctl_lowmem_reserve_ratio[idx] = 1;
 
                                lower_zone = pgdat->node_zones + idx;
-                               lower_zone->lowmem_reserve[j] = present_pages /
+                               lower_zone->lowmem_reserve[j] = managed_pages /
                                        sysctl_lowmem_reserve_ratio[idx];
-                               present_pages += lower_zone->present_pages;
+                               managed_pages += lower_zone->managed_pages;
                        }
                }
        }
@@ -5503,14 +5503,14 @@ static void __setup_per_zone_wmarks(void)
        /* Calculate total number of !ZONE_HIGHMEM pages */
        for_each_zone(zone) {
                if (!is_highmem(zone))
-                       lowmem_pages += zone->present_pages;
+                       lowmem_pages += zone->managed_pages;
        }
 
        for_each_zone(zone) {
                u64 tmp;
 
                spin_lock_irqsave(&zone->lock, flags);
-               tmp = (u64)pages_min * zone->present_pages;
+               tmp = (u64)pages_min * zone->managed_pages;
                do_div(tmp, lowmem_pages);
                if (is_highmem(zone)) {
                        /*
@@ -5524,7 +5524,7 @@ static void __setup_per_zone_wmarks(void)
                         */
                        unsigned long min_pages;
 
-                       min_pages = zone->present_pages / 1024;
+                       min_pages = zone->managed_pages / 1024;
                        min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL);
                        zone->watermark[WMARK_MIN] = min_pages;
                } else {
@@ -5586,7 +5586,7 @@ static void __meminit calculate_zone_inactive_ratio(struct zone *zone)
        unsigned int gb, ratio;
 
        /* Zone size in gigabytes */
-       gb = zone->present_pages >> (30 - PAGE_SHIFT);
+       gb = zone->managed_pages >> (30 - PAGE_SHIFT);
        if (gb)
                ratio = int_sqrt(10 * gb);
        else
@@ -5672,7 +5672,7 @@ int sysctl_min_unmapped_ratio_sysctl_handler(ctl_table *table, int write,
                return rc;
 
        for_each_zone(zone)
-               zone->min_unmapped_pages = (zone->present_pages *
+               zone->min_unmapped_pages = (zone->managed_pages *
                                sysctl_min_unmapped_ratio) / 100;
        return 0;
 }
@@ -5688,7 +5688,7 @@ int sysctl_min_slab_ratio_sysctl_handler(ctl_table *table, int write,
                return rc;
 
        for_each_zone(zone)
-               zone->min_slab_pages = (zone->present_pages *
+               zone->min_slab_pages = (zone->managed_pages *
                                sysctl_min_slab_ratio) / 100;
        return 0;
 }
@@ -5730,7 +5730,7 @@ int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write,
        for_each_populated_zone(zone) {
                for_each_possible_cpu(cpu) {
                        unsigned long  high;
-                       high = zone->present_pages / percpu_pagelist_fraction;
+                       high = zone->managed_pages / percpu_pagelist_fraction;
                        setup_pagelist_highmark(
                                per_cpu_ptr(zone->pageset, cpu), high);
                }

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 4093b99..8fde2fc 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2010,7 +2010,7 @@ static inline bool compaction_ready(struct zone *zone, struct scan_control *sc)
         * a reasonable chance of completing and allocating the page
         */
        balance_gap = min(low_wmark_pages(zone),
-               (zone->present_pages + KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
+               (zone->managed_pages + KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
                        KSWAPD_ZONE_BALANCE_GAP_RATIO);
        watermark = high_wmark_pages(zone) + balance_gap + (2UL << sc->order);
        watermark_ok = zone_watermark_ok_safe(zone, 0, watermark, 0, 0);
@@ -2525,7 +2525,7 @@ static bool zone_balanced(struct zone *zone, int order,
  */
 static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx)
 {
-       unsigned long present_pages = 0;
+       unsigned long managed_pages = 0;
        unsigned long balanced_pages = 0;
        int i;
 
@@ -2536,7 +2536,7 @@ static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx)
                if (!populated_zone(zone))
                        continue;
 
-               present_pages += zone->present_pages;
+               managed_pages += zone->managed_pages;
 
                /*
                 * A special case here:
@@ -2546,18 +2546,18 @@ static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx)
                 * they must be considered balanced here as well!
                 */
                if (zone->all_unreclaimable) {
-                       balanced_pages += zone->present_pages;
+                       balanced_pages += zone->managed_pages;
                        continue;
                }
 
                if (zone_balanced(zone, order, 0, i))
-                       balanced_pages += zone->present_pages;
+                       balanced_pages += zone->managed_pages;
                else if (!order)
                        return false;
        }
 
        if (order)
-               return balanced_pages >= (present_pages >> 2);
+               return balanced_pages >= (managed_pages >> 2);
        else
                return true;
 }
@@ -2745,7 +2745,7 @@ loop_again:
                         * of the zone, whichever is smaller.
                         */
                        balance_gap = min(low_wmark_pages(zone),
-                               (zone->present_pages +
+                               (zone->managed_pages +
                                        KSWAPD_ZONE_BALANCE_GAP_RATIO-1) /
                                KSWAPD_ZONE_BALANCE_GAP_RATIO);
                        /*

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 9800306..e3475f5 100644 (file)
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -142,7 +142,7 @@ int calculate_normal_threshold(struct zone *zone)
         * 125          1024            10      16-32 GB        9
         */
 
-       mem = zone->present_pages >> (27 - PAGE_SHIFT);
+       mem = zone->managed_pages >> (27 - PAGE_SHIFT);
 
        threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem));