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1 /*
2  * mm_init.c - Memory initialisation verification and debugging
3  *
4  * Copyright 2008 IBM Corporation, 2008
5  * Author Mel Gorman <mel@csn.ul.ie>
6  *
7  */
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/kobject.h>
11 #include <linux/export.h>
12 #include <linux/memory.h>
13 #include <linux/notifier.h>
14 #include <linux/sched.h>
15 #include "internal.h"
16
17 #ifdef CONFIG_DEBUG_MEMORY_INIT
18 int __meminitdata mminit_loglevel;
19
20 #ifndef SECTIONS_SHIFT
21 #define SECTIONS_SHIFT  0
22 #endif
23
24 /* The zonelists are simply reported, validation is manual. */
25 void __init mminit_verify_zonelist(void)
26 {
27         int nid;
28
29         if (mminit_loglevel < MMINIT_VERIFY)
30                 return;
31
32         for_each_online_node(nid) {
33                 pg_data_t *pgdat = NODE_DATA(nid);
34                 struct zone *zone;
35                 struct zoneref *z;
36                 struct zonelist *zonelist;
37                 int i, listid, zoneid;
38
39                 BUG_ON(MAX_ZONELISTS > 2);
40                 for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
41
42                         /* Identify the zone and nodelist */
43                         zoneid = i % MAX_NR_ZONES;
44                         listid = i / MAX_NR_ZONES;
45                         zonelist = &pgdat->node_zonelists[listid];
46                         zone = &pgdat->node_zones[zoneid];
47                         if (!populated_zone(zone))
48                                 continue;
49
50                         /* Print information about the zonelist */
51                         printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
52                                 listid > 0 ? "thisnode" : "general", nid,
53                                 zone->name);
54
55                         /* Iterate the zonelist */
56                         for_each_zone_zonelist(zone, z, zonelist, zoneid) {
57 #ifdef CONFIG_NUMA
58                                 pr_cont("%d:%s ", zone->node, zone->name);
59 #else
60                                 pr_cont("0:%s ", zone->name);
61 #endif /* CONFIG_NUMA */
62                         }
63                         pr_cont("\n");
64                 }
65         }
66 }
67
68 void __init mminit_verify_pageflags_layout(void)
69 {
70         int shift, width;
71         unsigned long or_mask, add_mask;
72
73         shift = 8 * sizeof(unsigned long);
74         width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH - LAST_CPUPID_SHIFT;
75         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
76                 "Section %d Node %d Zone %d Lastcpupid %d Flags %d\n",
77                 SECTIONS_WIDTH,
78                 NODES_WIDTH,
79                 ZONES_WIDTH,
80                 LAST_CPUPID_WIDTH,
81                 NR_PAGEFLAGS);
82         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
83                 "Section %d Node %d Zone %d Lastcpupid %d\n",
84                 SECTIONS_SHIFT,
85                 NODES_SHIFT,
86                 ZONES_SHIFT,
87                 LAST_CPUPID_SHIFT);
88         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
89                 "Section %lu Node %lu Zone %lu Lastcpupid %lu\n",
90                 (unsigned long)SECTIONS_PGSHIFT,
91                 (unsigned long)NODES_PGSHIFT,
92                 (unsigned long)ZONES_PGSHIFT,
93                 (unsigned long)LAST_CPUPID_PGSHIFT);
94         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid",
95                 "Node/Zone ID: %lu -> %lu\n",
96                 (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT),
97                 (unsigned long)ZONEID_PGOFF);
98         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
99                 "location: %d -> %d layout %d -> %d unused %d -> %d page-flags\n",
100                 shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
101 #ifdef NODE_NOT_IN_PAGE_FLAGS
102         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
103                 "Node not in page flags");
104 #endif
105 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
106         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
107                 "Last cpupid not in page flags");
108 #endif
109
110         if (SECTIONS_WIDTH) {
111                 shift -= SECTIONS_WIDTH;
112                 BUG_ON(shift != SECTIONS_PGSHIFT);
113         }
114         if (NODES_WIDTH) {
115                 shift -= NODES_WIDTH;
116                 BUG_ON(shift != NODES_PGSHIFT);
117         }
118         if (ZONES_WIDTH) {
119                 shift -= ZONES_WIDTH;
120                 BUG_ON(shift != ZONES_PGSHIFT);
121         }
122
123         /* Check for bitmask overlaps */
124         or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
125                         (NODES_MASK << NODES_PGSHIFT) |
126                         (SECTIONS_MASK << SECTIONS_PGSHIFT);
127         add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
128                         (NODES_MASK << NODES_PGSHIFT) +
129                         (SECTIONS_MASK << SECTIONS_PGSHIFT);
130         BUG_ON(or_mask != add_mask);
131 }
132
133 static __init int set_mminit_loglevel(char *str)
134 {
135         get_option(&str, &mminit_loglevel);
136         return 0;
137 }
138 early_param("mminit_loglevel", set_mminit_loglevel);
139 #endif /* CONFIG_DEBUG_MEMORY_INIT */
140
141 struct kobject *mm_kobj;
142 EXPORT_SYMBOL_GPL(mm_kobj);
143
144 #ifdef CONFIG_SMP
145 s32 vm_committed_as_batch = 32;
146
147 static void __meminit mm_compute_batch(void)
148 {
149         u64 memsized_batch;
150         s32 nr = num_present_cpus();
151         s32 batch = max_t(s32, nr*2, 32);
152
153         /* batch size set to 0.4% of (total memory/#cpus), or max int32 */
154         memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff);
155
156         vm_committed_as_batch = max_t(s32, memsized_batch, batch);
157 }
158
159 static int __meminit mm_compute_batch_notifier(struct notifier_block *self,
160                                         unsigned long action, void *arg)
161 {
162         switch (action) {
163         case MEM_ONLINE:
164         case MEM_OFFLINE:
165                 mm_compute_batch();
166         default:
167                 break;
168         }
169         return NOTIFY_OK;
170 }
171
172 static struct notifier_block compute_batch_nb __meminitdata = {
173         .notifier_call = mm_compute_batch_notifier,
174         .priority = IPC_CALLBACK_PRI, /* use lowest priority */
175 };
176
177 static int __init mm_compute_batch_init(void)
178 {
179         mm_compute_batch();
180         register_hotmemory_notifier(&compute_batch_nb);
181
182         return 0;
183 }
184
185 __initcall(mm_compute_batch_init);
186
187 #endif
188
189 static int __init mm_sysfs_init(void)
190 {
191         mm_kobj = kobject_create_and_add("mm", kernel_kobj);
192         if (!mm_kobj)
193                 return -ENOMEM;
194
195         return 0;
196 }
197 postcore_initcall(mm_sysfs_init);