Merge branch 'for-next-3.17' of git://git.samba.org/sfrench/cifs-2.6
[sfrench/cifs-2.6.git] / mm / mm_init.c
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 "internal.h"
15
16 #ifdef CONFIG_DEBUG_MEMORY_INIT
17 int mminit_loglevel;
18
19 #ifndef SECTIONS_SHIFT
20 #define SECTIONS_SHIFT  0
21 #endif
22
23 /* The zonelists are simply reported, validation is manual. */
24 void mminit_verify_zonelist(void)
25 {
26         int nid;
27
28         if (mminit_loglevel < MMINIT_VERIFY)
29                 return;
30
31         for_each_online_node(nid) {
32                 pg_data_t *pgdat = NODE_DATA(nid);
33                 struct zone *zone;
34                 struct zoneref *z;
35                 struct zonelist *zonelist;
36                 int i, listid, zoneid;
37
38                 BUG_ON(MAX_ZONELISTS > 2);
39                 for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
40
41                         /* Identify the zone and nodelist */
42                         zoneid = i % MAX_NR_ZONES;
43                         listid = i / MAX_NR_ZONES;
44                         zonelist = &pgdat->node_zonelists[listid];
45                         zone = &pgdat->node_zones[zoneid];
46                         if (!populated_zone(zone))
47                                 continue;
48
49                         /* Print information about the zonelist */
50                         printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
51                                 listid > 0 ? "thisnode" : "general", nid,
52                                 zone->name);
53
54                         /* Iterate the zonelist */
55                         for_each_zone_zonelist(zone, z, zonelist, zoneid) {
56 #ifdef CONFIG_NUMA
57                                 printk(KERN_CONT "%d:%s ",
58                                         zone->node, zone->name);
59 #else
60                                 printk(KERN_CONT "0:%s ", zone->name);
61 #endif /* CONFIG_NUMA */
62                         }
63                         printk(KERN_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 void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
134                         unsigned long nid, unsigned long pfn)
135 {
136         BUG_ON(page_to_nid(page) != nid);
137         BUG_ON(page_zonenum(page) != zone);
138         BUG_ON(page_to_pfn(page) != pfn);
139 }
140
141 static __init int set_mminit_loglevel(char *str)
142 {
143         get_option(&str, &mminit_loglevel);
144         return 0;
145 }
146 early_param("mminit_loglevel", set_mminit_loglevel);
147 #endif /* CONFIG_DEBUG_MEMORY_INIT */
148
149 struct kobject *mm_kobj;
150 EXPORT_SYMBOL_GPL(mm_kobj);
151
152 #ifdef CONFIG_SMP
153 s32 vm_committed_as_batch = 32;
154
155 static void __meminit mm_compute_batch(void)
156 {
157         u64 memsized_batch;
158         s32 nr = num_present_cpus();
159         s32 batch = max_t(s32, nr*2, 32);
160
161         /* batch size set to 0.4% of (total memory/#cpus), or max int32 */
162         memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff);
163
164         vm_committed_as_batch = max_t(s32, memsized_batch, batch);
165 }
166
167 static int __meminit mm_compute_batch_notifier(struct notifier_block *self,
168                                         unsigned long action, void *arg)
169 {
170         switch (action) {
171         case MEM_ONLINE:
172         case MEM_OFFLINE:
173                 mm_compute_batch();
174         default:
175                 break;
176         }
177         return NOTIFY_OK;
178 }
179
180 static struct notifier_block compute_batch_nb __meminitdata = {
181         .notifier_call = mm_compute_batch_notifier,
182         .priority = IPC_CALLBACK_PRI, /* use lowest priority */
183 };
184
185 static int __init mm_compute_batch_init(void)
186 {
187         mm_compute_batch();
188         register_hotmemory_notifier(&compute_batch_nb);
189
190         return 0;
191 }
192
193 __initcall(mm_compute_batch_init);
194
195 #endif
196
197 static int __init mm_sysfs_init(void)
198 {
199         mm_kobj = kobject_create_and_add("mm", kernel_kobj);
200         if (!mm_kobj)
201                 return -ENOMEM;
202
203         return 0;
204 }
205 postcore_initcall(mm_sysfs_init);