mm, mem-hotplug: recalculate lowmem_reserve when memory hotplug occurs

Currently, memory hotplug calls setup_per_zone_wmarks() and
calculate_zone_inactive_ratio(), but doesn't call
setup_per_zone_lowmem_reserve().

It means the number of reserved pages aren't updated even if memory hot
plug occur.  This patch fixes it.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 8 insertions, 7 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 57d3d5fade16..e173cd297d88 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1381,7 +1381,7 @@ extern void set_dma_reserve(unsigned long new_dma_reserve);
 extern void memmap_init_zone(unsigned long, int, unsigned long,
                                 unsigned long, enum memmap_context);
 extern void setup_per_zone_wmarks(void);
-extern void calculate_zone_inactive_ratio(struct zone *zone);
+extern int __meminit init_per_zone_wmark_min(void);
 extern void mem_init(void);
 extern void __init mmap_init(void);
 extern void show_mem(unsigned int flags);
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 2c4edc459fb0..59ac18fefd65 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -459,8 +459,9 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages)
                 zone_pcp_update(zone);
 
         mutex_unlock(&zonelists_mutex);
-        setup_per_zone_wmarks();
-        calculate_zone_inactive_ratio(zone);
+
+        init_per_zone_wmark_min();
+
         if (onlined_pages) {
                 kswapd_run(zone_to_nid(zone));
                 node_set_state(zone_to_nid(zone), N_HIGH_MEMORY);
@@ -893,8 +894,8 @@ repeat:
         zone->zone_pgdat->node_present_pages -= offlined_pages;
         totalram_pages -= offlined_pages;
 
-        setup_per_zone_wmarks();
-        calculate_zone_inactive_ratio(zone);
+        init_per_zone_wmark_min();
+
         if (!node_present_pages(node)) {
                 node_clear_state(node, N_HIGH_MEMORY);
                 kswapd_stop(node);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 56d0be36be9d..e133cea36932 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5094,7 +5094,7 @@ void setup_per_zone_wmarks(void)
  *    1TB     101        10GB
  *   10TB     320        32GB
  */
-void __meminit calculate_zone_inactive_ratio(struct zone *zone)
+static void __meminit calculate_zone_inactive_ratio(struct zone *zone)
 {
         unsigned int gb, ratio;
 
@@ -5140,7 +5140,7 @@ static void __meminit setup_per_zone_inactive_ratio(void)
  * 8192MB:      11584k
  * 16384MB:     16384k
  */
-static int __init init_per_zone_wmark_min(void)
+int __meminit init_per_zone_wmark_min(void)
 {
         unsigned long lowmem_kbytes;