mm: remove duplicated call of get_pfn_range_for_nid

When calculating pages in a node, for each zone in that node, we will
have

  zone_spanned_pages_in_node
    --> get_pfn_range_for_nid
  zone_absent_pages_in_node
    --> get_pfn_range_for_nid

That is to say, we call the get_pfn_range_for_nid to get start_pfn and
end_pfn of the node for MAX_NR_ZONES * 2 times.  And this is totally
unnecessary if we call the get_pfn_range_for_nid before
zone_*_pages_in_node add two extra arguments node_start_pfn and
node_end_pfn for zone_*_pages_in_node, then we can remove the
get_pfn_range_in_node in zone_*_pages_in_node.

[akpm@linux-foundation.org: make definitions more readable]
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 32 insertions, 11 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 327516b7aee9..7d5e40fe0c29 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4421,13 +4421,13 @@ static void __meminit adjust_zone_range_for_zone_movable(int nid,
  */
 static unsigned long __meminit zone_spanned_pages_in_node(int nid,
                                         unsigned long zone_type,
+                                        unsigned long node_start_pfn,
+                                        unsigned long node_end_pfn,
                                         unsigned long *ignored)
 {
-        unsigned long node_start_pfn, node_end_pfn;
         unsigned long zone_start_pfn, zone_end_pfn;
 
-        /* Get the start and end of the node and zone */
-        get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn);
+        /* Get the start and end of the zone */
         zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type];
         zone_end_pfn = arch_zone_highest_possible_pfn[zone_type];
         adjust_zone_range_for_zone_movable(nid, zone_type,
@@ -4482,14 +4482,14 @@ unsigned long __init absent_pages_in_range(unsigned long start_pfn,
 /* Return the number of page frames in holes in a zone on a node */
 static unsigned long __meminit zone_absent_pages_in_node(int nid,
                                         unsigned long zone_type,
+                                        unsigned long node_start_pfn,
+                                        unsigned long node_end_pfn,
                                         unsigned long *ignored)
 {
         unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type];
         unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type];
-        unsigned long node_start_pfn, node_end_pfn;
         unsigned long zone_start_pfn, zone_end_pfn;
 
-        get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn);
         zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high);
         zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high);
 
@@ -4502,6 +4502,8 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
 #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 static inline unsigned long __meminit zone_spanned_pages_in_node(int nid,
                                         unsigned long zone_type,
+                                        unsigned long node_start_pfn,
+                                        unsigned long node_end_pfn,
                                         unsigned long *zones_size)
 {
         return zones_size[zone_type];
@@ -4509,6 +4511,8 @@ static inline unsigned long __meminit zone_spanned_pages_in_node(int nid,
 
 static inline unsigned long __meminit zone_absent_pages_in_node(int nid,
                                                 unsigned long zone_type,
+                                                unsigned long node_start_pfn,
+                                                unsigned long node_end_pfn,
                                                 unsigned long *zholes_size)
 {
         if (!zholes_size)
@@ -4520,21 +4524,27 @@ static inline unsigned long __meminit zone_absent_pages_in_node(int nid,
 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
 static void __meminit calculate_node_totalpages(struct pglist_data *pgdat,
-                unsigned long *zones_size, unsigned long *zholes_size)
+                                                unsigned long node_start_pfn,
+                                                unsigned long node_end_pfn,
+                                                unsigned long *zones_size,
+                                                unsigned long *zholes_size)
 {
         unsigned long realtotalpages, totalpages = 0;
         enum zone_type i;
 
         for (i = 0; i < MAX_NR_ZONES; i++)
                 totalpages += zone_spanned_pages_in_node(pgdat->node_id, i,
-                                                                zones_size);
+                                                         node_start_pfn,
+                                                         node_end_pfn,
+                                                         zones_size);
         pgdat->node_spanned_pages = totalpages;
 
         realtotalpages = totalpages;
         for (i = 0; i < MAX_NR_ZONES; i++)
                 realtotalpages -=
                         zone_absent_pages_in_node(pgdat->node_id, i,
-                                                                zholes_size);
+                                                  node_start_pfn, node_end_pfn,
+                                                  zholes_size);
         pgdat->node_present_pages = realtotalpages;
         printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id,
                                                         realtotalpages);
@@ -4643,6 +4653,7 @@ static unsigned long __paginginit calc_memmap_size(unsigned long spanned_pages,
  * NOTE: pgdat should get zeroed by caller.
  */
 static void __paginginit free_area_init_core(struct pglist_data *pgdat,
+                unsigned long node_start_pfn, unsigned long node_end_pfn,
                 unsigned long *zones_size, unsigned long *zholes_size)
 {
         enum zone_type j;
@@ -4664,8 +4675,11 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
                 struct zone *zone = pgdat->node_zones + j;
                 unsigned long size, realsize, freesize, memmap_pages;
 
-                size = zone_spanned_pages_in_node(nid, j, zones_size);
+                size = zone_spanned_pages_in_node(nid, j, node_start_pfn,
+                                                  node_end_pfn, zones_size);
                 realsize = freesize = size - zone_absent_pages_in_node(nid, j,
+                                                                node_start_pfn,
+                                                                node_end_pfn,
                                                                 zholes_size);
 
                 /*
@@ -4779,6 +4793,8 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
                 unsigned long node_start_pfn, unsigned long *zholes_size)
 {
         pg_data_t *pgdat = NODE_DATA(nid);
+        unsigned long start_pfn = 0;
+        unsigned long end_pfn = 0;
 
         /* pg_data_t should be reset to zero when it's allocated */
         WARN_ON(pgdat->nr_zones || pgdat->classzone_idx);
@@ -4786,7 +4802,11 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
         pgdat->node_id = nid;
         pgdat->node_start_pfn = node_start_pfn;
         init_zone_allows_reclaim(nid);
-        calculate_node_totalpages(pgdat, zones_size, zholes_size);
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
+        get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
+#endif
+        calculate_node_totalpages(pgdat, start_pfn, end_pfn,
+                                  zones_size, zholes_size);
 
         alloc_node_mem_map(pgdat);
 #ifdef CONFIG_FLAT_NODE_MEM_MAP
@@ -4795,7 +4815,8 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
                 (unsigned long)pgdat->node_mem_map);
 #endif
 
-        free_area_init_core(pgdat, zones_size, zholes_size);
+        free_area_init_core(pgdat, start_pfn, end_pfn,
+                            zones_size, zholes_size);
 }
 
 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP