2 * mm_init.c - Memory initialisation verification and debugging
4 * Copyright 2008 IBM Corporation, 2008
5 * Author Mel Gorman <mel@csn.ul.ie>
8 #include <linux/kernel.h>
9 #include <linux/init.h>
12 #ifdef CONFIG_DEBUG_MEMORY_INIT
13 int __meminitdata mminit_loglevel
;
15 /* The zonelists are simply reported, validation is manual. */
16 void mminit_verify_zonelist(void)
20 if (mminit_loglevel
< MMINIT_VERIFY
)
23 for_each_online_node(nid
) {
24 pg_data_t
*pgdat
= NODE_DATA(nid
);
27 struct zonelist
*zonelist
;
28 int i
, listid
, zoneid
;
30 BUG_ON(MAX_ZONELISTS
> 2);
31 for (i
= 0; i
< MAX_ZONELISTS
* MAX_NR_ZONES
; i
++) {
33 /* Identify the zone and nodelist */
34 zoneid
= i
% MAX_NR_ZONES
;
35 listid
= i
/ MAX_NR_ZONES
;
36 zonelist
= &pgdat
->node_zonelists
[listid
];
37 zone
= &pgdat
->node_zones
[zoneid
];
38 if (!populated_zone(zone
))
41 /* Print information about the zonelist */
42 printk(KERN_DEBUG
"mminit::zonelist %s %d:%s = ",
43 listid
> 0 ? "thisnode" : "general", nid
,
46 /* Iterate the zonelist */
47 for_each_zone_zonelist(zone
, z
, zonelist
, zoneid
) {
49 printk(KERN_CONT
"%d:%s ",
50 zone
->node
, zone
->name
);
52 printk(KERN_CONT
"0:%s ", zone
->name
);
53 #endif /* CONFIG_NUMA */
55 printk(KERN_CONT
"\n");
60 void __init
mminit_verify_pageflags_layout(void)
63 unsigned long or_mask
, add_mask
;
65 shift
= 8 * sizeof(unsigned long);
66 width
= shift
- SECTIONS_WIDTH
- NODES_WIDTH
- ZONES_WIDTH
;
67 mminit_dprintk(MMINIT_TRACE
, "pageflags_layout_widths",
68 "Section %d Node %d Zone %d Flags %d\n",
73 mminit_dprintk(MMINIT_TRACE
, "pageflags_layout_shifts",
74 "Section %d Node %d Zone %d\n",
82 mminit_dprintk(MMINIT_TRACE
, "pageflags_layout_offsets",
83 "Section %lu Node %lu Zone %lu\n",
84 (unsigned long)SECTIONS_PGSHIFT
,
85 (unsigned long)NODES_PGSHIFT
,
86 (unsigned long)ZONES_PGSHIFT
);
87 mminit_dprintk(MMINIT_TRACE
, "pageflags_layout_zoneid",
88 "Zone ID: %lu -> %lu\n",
89 (unsigned long)ZONEID_PGOFF
,
90 (unsigned long)(ZONEID_PGOFF
+ ZONEID_SHIFT
));
91 mminit_dprintk(MMINIT_TRACE
, "pageflags_layout_usage",
92 "location: %d -> %d unused %d -> %d flags %d -> %d\n",
93 shift
, width
, width
, NR_PAGEFLAGS
, NR_PAGEFLAGS
, 0);
94 #ifdef NODE_NOT_IN_PAGE_FLAGS
95 mminit_dprintk(MMINIT_TRACE
, "pageflags_layout_nodeflags",
96 "Node not in page flags");
100 shift
-= SECTIONS_WIDTH
;
101 BUG_ON(shift
!= SECTIONS_PGSHIFT
);
104 shift
-= NODES_WIDTH
;
105 BUG_ON(shift
!= NODES_PGSHIFT
);
108 shift
-= ZONES_WIDTH
;
109 BUG_ON(shift
!= ZONES_PGSHIFT
);
112 /* Check for bitmask overlaps */
113 or_mask
= (ZONES_MASK
<< ZONES_PGSHIFT
) |
114 (NODES_MASK
<< NODES_PGSHIFT
) |
115 (SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
116 add_mask
= (ZONES_MASK
<< ZONES_PGSHIFT
) +
117 (NODES_MASK
<< NODES_PGSHIFT
) +
118 (SECTIONS_MASK
<< SECTIONS_PGSHIFT
);
119 BUG_ON(or_mask
!= add_mask
);
122 void __meminit
mminit_verify_page_links(struct page
*page
, enum zone_type zone
,
123 unsigned long nid
, unsigned long pfn
)
125 BUG_ON(page_to_nid(page
) != nid
);
126 BUG_ON(page_zonenum(page
) != zone
);
127 BUG_ON(page_to_pfn(page
) != pfn
);
130 static __init
int set_mminit_loglevel(char *str
)
132 get_option(&str
, &mminit_loglevel
);
135 early_param("mminit_loglevel", set_mminit_loglevel
);
136 #endif /* CONFIG_DEBUG_MEMORY_INIT */