mm_init.c 5.02 KB
Newer Older
1
2
3
4
5
6
7
8
9
/*
 * mm_init.c - Memory initialisation verification and debugging
 *
 * Copyright 2008 IBM Corporation, 2008
 * Author Mel Gorman <mel@csn.ul.ie>
 *
 */
#include <linux/kernel.h>
#include <linux/init.h>
10
#include <linux/kobject.h>
11
#include <linux/export.h>
12
13
#include <linux/memory.h>
#include <linux/notifier.h>
14
#include "internal.h"
15

16
#ifdef CONFIG_DEBUG_MEMORY_INIT
17
int mminit_loglevel;
18

19
20
21
22
#ifndef SECTIONS_SHIFT
#define SECTIONS_SHIFT	0
#endif

23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
/* The zonelists are simply reported, validation is manual. */
void mminit_verify_zonelist(void)
{
	int nid;

	if (mminit_loglevel < MMINIT_VERIFY)
		return;

	for_each_online_node(nid) {
		pg_data_t *pgdat = NODE_DATA(nid);
		struct zone *zone;
		struct zoneref *z;
		struct zonelist *zonelist;
		int i, listid, zoneid;

		BUG_ON(MAX_ZONELISTS > 2);
		for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {

			/* Identify the zone and nodelist */
			zoneid = i % MAX_NR_ZONES;
			listid = i / MAX_NR_ZONES;
			zonelist = &pgdat->node_zonelists[listid];
			zone = &pgdat->node_zones[zoneid];
			if (!populated_zone(zone))
				continue;

			/* Print information about the zonelist */
			printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
				listid > 0 ? "thisnode" : "general", nid,
				zone->name);

			/* Iterate the zonelist */
			for_each_zone_zonelist(zone, z, zonelist, zoneid) {
#ifdef CONFIG_NUMA
				printk(KERN_CONT "%d:%s ",
					zone->node, zone->name);
#else
				printk(KERN_CONT "0:%s ", zone->name);
#endif /* CONFIG_NUMA */
			}
			printk(KERN_CONT "\n");
		}
	}
}

68
69
70
71
72
73
void __init mminit_verify_pageflags_layout(void)
{
	int shift, width;
	unsigned long or_mask, add_mask;

	shift = 8 * sizeof(unsigned long);
74
	width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH - LAST_NID_SHIFT;
75
	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
76
		"Section %d Node %d Zone %d Lastnid %d Flags %d\n",
77
78
79
		SECTIONS_WIDTH,
		NODES_WIDTH,
		ZONES_WIDTH,
80
		LAST_NID_WIDTH,
81
82
		NR_PAGEFLAGS);
	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
83
		"Section %d Node %d Zone %d Lastnid %d\n",
84
85
		SECTIONS_SHIFT,
		NODES_SHIFT,
86
87
88
89
		ZONES_SHIFT,
		LAST_NID_SHIFT);
	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
		"Section %lu Node %lu Zone %lu Lastnid %lu\n",
90
91
		(unsigned long)SECTIONS_PGSHIFT,
		(unsigned long)NODES_PGSHIFT,
92
93
94
95
96
97
		(unsigned long)ZONES_PGSHIFT,
		(unsigned long)LAST_NID_PGSHIFT);
	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid",
		"Node/Zone ID: %lu -> %lu\n",
		(unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT),
		(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
101
102
103
104
		shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
#ifdef NODE_NOT_IN_PAGE_FLAGS
	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
		"Node not in page flags");
#endif
105
106
107
108
#ifdef LAST_NID_NOT_IN_PAGE_FLAGS
	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
		"Last nid not in page flags");
#endif
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140

	if (SECTIONS_WIDTH) {
		shift -= SECTIONS_WIDTH;
		BUG_ON(shift != SECTIONS_PGSHIFT);
	}
	if (NODES_WIDTH) {
		shift -= NODES_WIDTH;
		BUG_ON(shift != NODES_PGSHIFT);
	}
	if (ZONES_WIDTH) {
		shift -= ZONES_WIDTH;
		BUG_ON(shift != ZONES_PGSHIFT);
	}

	/* Check for bitmask overlaps */
	or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
			(NODES_MASK << NODES_PGSHIFT) |
			(SECTIONS_MASK << SECTIONS_PGSHIFT);
	add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
			(NODES_MASK << NODES_PGSHIFT) +
			(SECTIONS_MASK << SECTIONS_PGSHIFT);
	BUG_ON(or_mask != add_mask);
}

void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
			unsigned long nid, unsigned long pfn)
{
	BUG_ON(page_to_nid(page) != nid);
	BUG_ON(page_zonenum(page) != zone);
	BUG_ON(page_to_pfn(page) != pfn);
}

141
142
143
144
145
146
static __init int set_mminit_loglevel(char *str)
{
	get_option(&str, &mminit_loglevel);
	return 0;
}
early_param("mminit_loglevel", set_mminit_loglevel);
147
#endif /* CONFIG_DEBUG_MEMORY_INIT */
148
149
150
151

struct kobject *mm_kobj;
EXPORT_SYMBOL_GPL(mm_kobj);

152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
#ifdef CONFIG_SMP
s32 vm_committed_as_batch = 32;

static void __meminit mm_compute_batch(void)
{
	u64 memsized_batch;
	s32 nr = num_present_cpus();
	s32 batch = max_t(s32, nr*2, 32);

	/* batch size set to 0.4% of (total memory/#cpus), or max int32 */
	memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff);

	vm_committed_as_batch = max_t(s32, memsized_batch, batch);
}

static int __meminit mm_compute_batch_notifier(struct notifier_block *self,
					unsigned long action, void *arg)
{
	switch (action) {
	case MEM_ONLINE:
	case MEM_OFFLINE:
		mm_compute_batch();
	default:
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block compute_batch_nb __meminitdata = {
	.notifier_call = mm_compute_batch_notifier,
	.priority = IPC_CALLBACK_PRI, /* use lowest priority */
};

static int __init mm_compute_batch_init(void)
{
	mm_compute_batch();
	register_hotmemory_notifier(&compute_batch_nb);

	return 0;
}

__initcall(mm_compute_batch_init);

#endif

197
198
199
200
201
202
203
204
205
206
static int __init mm_sysfs_init(void)
{
	mm_kobj = kobject_create_and_add("mm", kernel_kobj);
	if (!mm_kobj)
		return -ENOMEM;

	return 0;
}

__initcall(mm_sysfs_init);