[PATCH 2/2] mm/page_alloc: recalculate some of node threshold when on/offline memory

[js1304@xxxxxxxxx]

From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>

Some of node threshold depends on number of managed pages in the node.
When memory is going on/offline, it can be changed and we need to
adjust them.

This patch add recalculation to appropriate places and clean-up
related function for better maintanance.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
---
 mm/page_alloc.c | 50 +++++++++++++++++++++++++++++++++++---------------
 1 file changed, 35 insertions(+), 15 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 555b609..277c3d0 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4793,6 +4793,8 @@ int local_memory_node(int node)
 }
 #endif
 
+static void setup_min_unmapped_ratio(void);
+static void setup_min_slab_ratio(void);
 #else	/* CONFIG_NUMA */
 
 static void set_zonelist_order(void)
@@ -5914,9 +5916,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
 		zone->managed_pages = is_highmem_idx(j) ? realsize : freesize;
 #ifdef CONFIG_NUMA
 		zone->node = nid;
-		pgdat->min_unmapped_pages += (freesize*sysctl_min_unmapped_ratio)
-						/ 100;
-		pgdat->min_slab_pages += (freesize * sysctl_min_slab_ratio) / 100;
 #endif
 		zone->name = zone_names[j];
 		zone->zone_pgdat = pgdat;
@@ -6841,6 +6840,12 @@ int __meminit init_per_zone_wmark_min(void)
 	setup_per_zone_wmarks();
 	refresh_zone_stat_thresholds();
 	setup_per_zone_lowmem_reserve();
+
+#ifdef CONFIG_NUMA
+	setup_min_unmapped_ratio();
+	setup_min_slab_ratio();
+#endif
+
 	return 0;
 }
 core_initcall(init_per_zone_wmark_min)
@@ -6882,16 +6887,10 @@ int watermark_scale_factor_sysctl_handler(struct ctl_table *table, int write,
 }
 
 #ifdef CONFIG_NUMA
-int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write,
-	void __user *buffer, size_t *length, loff_t *ppos)
+static void setup_min_unmapped_ratio(void)
 {
-	struct pglist_data *pgdat;
+	pg_data_t *pgdat;
 	struct zone *zone;
-	int rc;
-
-	rc = proc_dointvec_minmax(table, write, buffer, length, ppos);
-	if (rc)
-		return rc;
 
 	for_each_online_pgdat(pgdat)
 		pgdat->min_unmapped_pages = 0;
@@ -6899,26 +6898,47 @@ int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write,
 	for_each_zone(zone)
 		zone->zone_pgdat->min_unmapped_pages += (zone->managed_pages *
 				sysctl_min_unmapped_ratio) / 100;
-	return 0;
 }
 
-int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *table, int write,
+
+int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write,
 	void __user *buffer, size_t *length, loff_t *ppos)
 {
-	struct pglist_data *pgdat;
-	struct zone *zone;
 	int rc;
 
 	rc = proc_dointvec_minmax(table, write, buffer, length, ppos);
 	if (rc)
 		return rc;
 
+	setup_min_unmapped_ratio();
+
+	return 0;
+}
+
+static void setup_min_slab_ratio(void)
+{
+	pg_data_t *pgdat;
+	struct zone *zone;
+
 	for_each_online_pgdat(pgdat)
 		pgdat->min_slab_pages = 0;
 
 	for_each_zone(zone)
 		zone->zone_pgdat->min_slab_pages += (zone->managed_pages *
 				sysctl_min_slab_ratio) / 100;
+}
+
+int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *table, int write,
+	void __user *buffer, size_t *length, loff_t *ppos)
+{
+	int rc;
+
+	rc = proc_dointvec_minmax(table, write, buffer, length, ppos);
+	if (rc)
+		return rc;
+
+	setup_min_slab_ratio();
+
 	return 0;
 }
 #endif
-- 
1.9.1

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