mm/vmstat.c: uninline node_page_state()

With x86_64 (config http://ozlabs.org/~akpm/config-akpm2.txt) and old gcc
(4.4.4), drivers/base/node.c:node_read_meminfo() is using 2344 bytes of
stack.  Uninlining node_page_state() reduces this to 440 bytes.

The stack consumption issue is fixed by newer gcc (4.8.4) however with
that compiler this patch reduces the node.o text size from 7314 bytes to
4578.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 82e7db7f7100f9e141de4a90196bffa24814ecc8..49dfe40b3673b6c80544dc1cb27a558218d92264 100644 (file)
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -161,30 +161,8 @@ static inline unsigned long zone_page_state_snapshot(struct zone *zone,
 }
 
 #ifdef CONFIG_NUMA
-/*
- * Determine the per node value of a stat item. This function
- * is called frequently in a NUMA machine, so try to be as
- * frugal as possible.
- */
-static inline unsigned long node_page_state(int node,
-                                enum zone_stat_item item)
-{
-       struct zone *zones = NODE_DATA(node)->node_zones;
-
-       return
-#ifdef CONFIG_ZONE_DMA
-               zone_page_state(&zones[ZONE_DMA], item) +
-#endif
-#ifdef CONFIG_ZONE_DMA32
-               zone_page_state(&zones[ZONE_DMA32], item) +
-#endif
-#ifdef CONFIG_HIGHMEM
-               zone_page_state(&zones[ZONE_HIGHMEM], item) +
-#endif
-               zone_page_state(&zones[ZONE_NORMAL], item) +
-               zone_page_state(&zones[ZONE_MOVABLE], item);
-}
 
+extern unsigned long node_page_state(int node, enum zone_stat_item item);
 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp);
 
 #else

diff --git a/mm/vmstat.c b/mm/vmstat.c
index fbf14485a0498bf181e81f43bc69a0522e67afd5..ffcb4f58bf3eb4cbe7cc13b74a7793c52d14b192 100644 (file)
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -591,6 +591,28 @@ void zone_statistics(struct zone *preferred_zone, struct zone *z, gfp_t flags)
        else
                __inc_zone_state(z, NUMA_OTHER);
 }
+
+/*
+ * Determine the per node value of a stat item.
+ */
+unsigned long node_page_state(int node, enum zone_stat_item item)
+{
+       struct zone *zones = NODE_DATA(node)->node_zones;
+
+       return
+#ifdef CONFIG_ZONE_DMA
+               zone_page_state(&zones[ZONE_DMA], item) +
+#endif
+#ifdef CONFIG_ZONE_DMA32
+               zone_page_state(&zones[ZONE_DMA32], item) +
+#endif
+#ifdef CONFIG_HIGHMEM
+               zone_page_state(&zones[ZONE_HIGHMEM], item) +
+#endif
+               zone_page_state(&zones[ZONE_NORMAL], item) +
+               zone_page_state(&zones[ZONE_MOVABLE], item);
+}
+
 #endif
 
 #ifdef CONFIG_COMPACTION