mm: print out the zonelists on request for manual verification

This patch prints out the zonelists during boot for manual verification by the
user if the mminit_loglevel is MMINIT_VERIFY or higher.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 51 insertions, 0 deletions

diff --git a/mm/internal.h b/mm/internal.h
index 5d17f3efac41..50807e12490e 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -81,6 +81,7 @@ do { \
 extern void mminit_verify_pageflags_layout(void);
 extern void mminit_verify_page_links(struct page *page,
                 enum zone_type zone, unsigned long nid, unsigned long pfn);
+extern void mminit_verify_zonelist(void);
 
 #else
 
@@ -97,6 +98,10 @@ static inline void mminit_verify_page_links(struct page *page,
                 enum zone_type zone, unsigned long nid, unsigned long pfn)
 {
 }
+
+static inline void mminit_verify_zonelist(void)
+{
+}
 #endif /* CONFIG_DEBUG_MEMORY_INIT */
 
 /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
diff --git a/mm/mm_init.c b/mm/mm_init.c
index e16990d629e6..ce445ca097e7 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -11,6 +11,51 @@
 
 int __meminitdata mminit_loglevel;
 
+/* The zonelists are simply reported, validation is manual. */
+void mminit_verify_zonelist(void)
+{
+        int nid;
+
+        if (mminit_loglevel < MMINIT_VERIFY)
+                return;
+
+        for_each_online_node(nid) {
+                pg_data_t *pgdat = NODE_DATA(nid);
+                struct zone *zone;
+                struct zoneref *z;
+                struct zonelist *zonelist;
+                int i, listid, zoneid;
+
+                BUG_ON(MAX_ZONELISTS > 2);
+                for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
+
+                        /* Identify the zone and nodelist */
+                        zoneid = i % MAX_NR_ZONES;
+                        listid = i / MAX_NR_ZONES;
+                        zonelist = &pgdat->node_zonelists[listid];
+                        zone = &pgdat->node_zones[zoneid];
+                        if (!populated_zone(zone))
+                                continue;
+
+                        /* Print information about the zonelist */
+                        printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
+                                listid > 0 ? "thisnode" : "general", nid,
+                                zone->name);
+
+                        /* Iterate the zonelist */
+                        for_each_zone_zonelist(zone, z, zonelist, zoneid) {
+#ifdef CONFIG_NUMA
+                                printk(KERN_CONT "%d:%s ",
+                                        zone->node, zone->name);
+#else
+                                printk(KERN_CONT "0:%s ", zone->name);
+#endif /* CONFIG_NUMA */
+                        }
+                        printk(KERN_CONT "\n");
+                }
+        }
+}
+
 void __init mminit_verify_pageflags_layout(void)
 {
         int shift, width;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0adb66e711e6..9ece07ce65b0 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2352,6 +2352,7 @@ void build_all_zonelists(void)
 
         if (system_state == SYSTEM_BOOTING) {
                 __build_all_zonelists(NULL);
+                mminit_verify_zonelist();
                 cpuset_init_current_mems_allowed();
         } else {
                 /* we have to stop all cpus to guarantee there is no user