Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / mm / mm_init.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * mm_init.c - Memory initialisation verification and debugging
4  *
5  * Copyright 2008 IBM Corporation, 2008
6  * Author Mel Gorman <mel@csn.ul.ie>
7  *
8  */
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/kobject.h>
12 #include <linux/export.h>
13 #include <linux/memory.h>
14 #include <linux/notifier.h>
15 #include <linux/sched.h>
16 #include "internal.h"
17
18 #ifdef CONFIG_DEBUG_MEMORY_INIT
19 int __meminitdata mminit_loglevel;
20
21 #ifndef SECTIONS_SHIFT
22 #define SECTIONS_SHIFT  0
23 #endif
24
25 /* The zonelists are simply reported, validation is manual. */
26 void __init mminit_verify_zonelist(void)
27 {
28         int nid;
29
30         if (mminit_loglevel < MMINIT_VERIFY)
31                 return;
32
33         for_each_online_node(nid) {
34                 pg_data_t *pgdat = NODE_DATA(nid);
35                 struct zone *zone;
36                 struct zoneref *z;
37                 struct zonelist *zonelist;
38                 int i, listid, zoneid;
39
40                 BUG_ON(MAX_ZONELISTS > 2);
41                 for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
42
43                         /* Identify the zone and nodelist */
44                         zoneid = i % MAX_NR_ZONES;
45                         listid = i / MAX_NR_ZONES;
46                         zonelist = &pgdat->node_zonelists[listid];
47                         zone = &pgdat->node_zones[zoneid];
48                         if (!populated_zone(zone))
49                                 continue;
50
51                         /* Print information about the zonelist */
52                         printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
53                                 listid > 0 ? "thisnode" : "general", nid,
54                                 zone->name);
55
56                         /* Iterate the zonelist */
57                         for_each_zone_zonelist(zone, z, zonelist, zoneid)
58                                 pr_cont("%d:%s ", zone_to_nid(zone), zone->name);
59                         pr_cont("\n");
60                 }
61         }
62 }
63
64 void __init mminit_verify_pageflags_layout(void)
65 {
66         int shift, width;
67         unsigned long or_mask, add_mask;
68
69         shift = 8 * sizeof(unsigned long);
70         width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH - LAST_CPUPID_SHIFT;
71         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
72                 "Section %d Node %d Zone %d Lastcpupid %d Flags %d\n",
73                 SECTIONS_WIDTH,
74                 NODES_WIDTH,
75                 ZONES_WIDTH,
76                 LAST_CPUPID_WIDTH,
77                 NR_PAGEFLAGS);
78         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
79                 "Section %d Node %d Zone %d Lastcpupid %d\n",
80                 SECTIONS_SHIFT,
81                 NODES_SHIFT,
82                 ZONES_SHIFT,
83                 LAST_CPUPID_SHIFT);
84         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
85                 "Section %lu Node %lu Zone %lu Lastcpupid %lu\n",
86                 (unsigned long)SECTIONS_PGSHIFT,
87                 (unsigned long)NODES_PGSHIFT,
88                 (unsigned long)ZONES_PGSHIFT,
89                 (unsigned long)LAST_CPUPID_PGSHIFT);
90         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid",
91                 "Node/Zone ID: %lu -> %lu\n",
92                 (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT),
93                 (unsigned long)ZONEID_PGOFF);
94         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
95                 "location: %d -> %d layout %d -> %d unused %d -> %d page-flags\n",
96                 shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
97 #ifdef NODE_NOT_IN_PAGE_FLAGS
98         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
99                 "Node not in page flags");
100 #endif
101 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
102         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
103                 "Last cpupid not in page flags");
104 #endif
105
106         if (SECTIONS_WIDTH) {
107                 shift -= SECTIONS_WIDTH;
108                 BUG_ON(shift != SECTIONS_PGSHIFT);
109         }
110         if (NODES_WIDTH) {
111                 shift -= NODES_WIDTH;
112                 BUG_ON(shift != NODES_PGSHIFT);
113         }
114         if (ZONES_WIDTH) {
115                 shift -= ZONES_WIDTH;
116                 BUG_ON(shift != ZONES_PGSHIFT);
117         }
118
119         /* Check for bitmask overlaps */
120         or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
121                         (NODES_MASK << NODES_PGSHIFT) |
122                         (SECTIONS_MASK << SECTIONS_PGSHIFT);
123         add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
124                         (NODES_MASK << NODES_PGSHIFT) +
125                         (SECTIONS_MASK << SECTIONS_PGSHIFT);
126         BUG_ON(or_mask != add_mask);
127 }
128
129 static __init int set_mminit_loglevel(char *str)
130 {
131         get_option(&str, &mminit_loglevel);
132         return 0;
133 }
134 early_param("mminit_loglevel", set_mminit_loglevel);
135 #endif /* CONFIG_DEBUG_MEMORY_INIT */
136
137 struct kobject *mm_kobj;
138 EXPORT_SYMBOL_GPL(mm_kobj);
139
140 #ifdef CONFIG_SMP
141 s32 vm_committed_as_batch = 32;
142
143 static void __meminit mm_compute_batch(void)
144 {
145         u64 memsized_batch;
146         s32 nr = num_present_cpus();
147         s32 batch = max_t(s32, nr*2, 32);
148
149         /* batch size set to 0.4% of (total memory/#cpus), or max int32 */
150         memsized_batch = min_t(u64, (totalram_pages()/nr)/256, 0x7fffffff);
151
152         vm_committed_as_batch = max_t(s32, memsized_batch, batch);
153 }
154
155 static int __meminit mm_compute_batch_notifier(struct notifier_block *self,
156                                         unsigned long action, void *arg)
157 {
158         switch (action) {
159         case MEM_ONLINE:
160         case MEM_OFFLINE:
161                 mm_compute_batch();
162         default:
163                 break;
164         }
165         return NOTIFY_OK;
166 }
167
168 static struct notifier_block compute_batch_nb __meminitdata = {
169         .notifier_call = mm_compute_batch_notifier,
170         .priority = IPC_CALLBACK_PRI, /* use lowest priority */
171 };
172
173 static int __init mm_compute_batch_init(void)
174 {
175         mm_compute_batch();
176         register_hotmemory_notifier(&compute_batch_nb);
177
178         return 0;
179 }
180
181 __initcall(mm_compute_batch_init);
182
183 #endif
184
185 static int __init mm_sysfs_init(void)
186 {
187         mm_kobj = kobject_create_and_add("mm", kernel_kobj);
188         if (!mm_kobj)
189                 return -ENOMEM;
190
191         return 0;
192 }
193 postcore_initcall(mm_sysfs_init);