usb: host: xhci-rcar: Change code for new SoCs
[linux/fpc-iii.git] / mm / mm_init.c
blobfdadf918de7691a57b3611cd7c45dec250b7c732
1 /*
2 * mm_init.c - Memory initialisation verification and debugging
4 * Copyright 2008 IBM Corporation, 2008
5 * Author Mel Gorman <mel@csn.ul.ie>
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"
17 #ifdef CONFIG_DEBUG_MEMORY_INIT
18 int __meminitdata mminit_loglevel;
20 #ifndef SECTIONS_SHIFT
21 #define SECTIONS_SHIFT 0
22 #endif
24 /* The zonelists are simply reported, validation is manual. */
25 void __init mminit_verify_zonelist(void)
27 int nid;
29 if (mminit_loglevel < MMINIT_VERIFY)
30 return;
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;
39 BUG_ON(MAX_ZONELISTS > 2);
40 for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
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;
50 /* Print information about the zonelist */
51 printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
52 listid > 0 ? "thisnode" : "general", nid,
53 zone->name);
55 /* Iterate the zonelist */
56 for_each_zone_zonelist(zone, z, zonelist, zoneid) {
57 #ifdef CONFIG_NUMA
58 printk(KERN_CONT "%d:%s ",
59 zone->node, zone->name);
60 #else
61 printk(KERN_CONT "0:%s ", zone->name);
62 #endif /* CONFIG_NUMA */
64 printk(KERN_CONT "\n");
69 void __init mminit_verify_pageflags_layout(void)
71 int shift, width;
72 unsigned long or_mask, add_mask;
74 shift = 8 * sizeof(unsigned long);
75 width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH - LAST_CPUPID_SHIFT;
76 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
77 "Section %d Node %d Zone %d Lastcpupid %d Flags %d\n",
78 SECTIONS_WIDTH,
79 NODES_WIDTH,
80 ZONES_WIDTH,
81 LAST_CPUPID_WIDTH,
82 NR_PAGEFLAGS);
83 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
84 "Section %d Node %d Zone %d Lastcpupid %d\n",
85 SECTIONS_SHIFT,
86 NODES_SHIFT,
87 ZONES_SHIFT,
88 LAST_CPUPID_SHIFT);
89 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
90 "Section %lu Node %lu Zone %lu Lastcpupid %lu\n",
91 (unsigned long)SECTIONS_PGSHIFT,
92 (unsigned long)NODES_PGSHIFT,
93 (unsigned long)ZONES_PGSHIFT,
94 (unsigned long)LAST_CPUPID_PGSHIFT);
95 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid",
96 "Node/Zone ID: %lu -> %lu\n",
97 (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT),
98 (unsigned long)ZONEID_PGOFF);
99 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
100 "location: %d -> %d layout %d -> %d unused %d -> %d page-flags\n",
101 shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
102 #ifdef NODE_NOT_IN_PAGE_FLAGS
103 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
104 "Node not in page flags");
105 #endif
106 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
107 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
108 "Last cpupid not in page flags");
109 #endif
111 if (SECTIONS_WIDTH) {
112 shift -= SECTIONS_WIDTH;
113 BUG_ON(shift != SECTIONS_PGSHIFT);
115 if (NODES_WIDTH) {
116 shift -= NODES_WIDTH;
117 BUG_ON(shift != NODES_PGSHIFT);
119 if (ZONES_WIDTH) {
120 shift -= ZONES_WIDTH;
121 BUG_ON(shift != ZONES_PGSHIFT);
124 /* Check for bitmask overlaps */
125 or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
126 (NODES_MASK << NODES_PGSHIFT) |
127 (SECTIONS_MASK << SECTIONS_PGSHIFT);
128 add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
129 (NODES_MASK << NODES_PGSHIFT) +
130 (SECTIONS_MASK << SECTIONS_PGSHIFT);
131 BUG_ON(or_mask != add_mask);
134 static __init int set_mminit_loglevel(char *str)
136 get_option(&str, &mminit_loglevel);
137 return 0;
139 early_param("mminit_loglevel", set_mminit_loglevel);
140 #endif /* CONFIG_DEBUG_MEMORY_INIT */
142 struct kobject *mm_kobj;
143 EXPORT_SYMBOL_GPL(mm_kobj);
145 #ifdef CONFIG_SMP
146 s32 vm_committed_as_batch = 32;
148 static void __meminit mm_compute_batch(void)
150 u64 memsized_batch;
151 s32 nr = num_present_cpus();
152 s32 batch = max_t(s32, nr*2, 32);
154 /* batch size set to 0.4% of (total memory/#cpus), or max int32 */
155 memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff);
157 vm_committed_as_batch = max_t(s32, memsized_batch, batch);
160 static int __meminit mm_compute_batch_notifier(struct notifier_block *self,
161 unsigned long action, void *arg)
163 switch (action) {
164 case MEM_ONLINE:
165 case MEM_OFFLINE:
166 mm_compute_batch();
167 default:
168 break;
170 return NOTIFY_OK;
173 static struct notifier_block compute_batch_nb __meminitdata = {
174 .notifier_call = mm_compute_batch_notifier,
175 .priority = IPC_CALLBACK_PRI, /* use lowest priority */
178 static int __init mm_compute_batch_init(void)
180 mm_compute_batch();
181 register_hotmemory_notifier(&compute_batch_nb);
183 return 0;
186 __initcall(mm_compute_batch_init);
188 #endif
190 static int __init mm_sysfs_init(void)
192 mm_kobj = kobject_create_and_add("mm", kernel_kobj);
193 if (!mm_kobj)
194 return -ENOMEM;
196 return 0;
198 postcore_initcall(mm_sysfs_init);