tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 "internal.h"
13
14#ifdef CONFIG_DEBUG_MEMORY_INIT
15int mminit_loglevel;
16
17#ifndef SECTIONS_SHIFT
18#define SECTIONS_SHIFT 0
19#endif
20
21/* The zonelists are simply reported, validation is manual. */
22void mminit_verify_zonelist(void)
23{
24 int nid;
25
26 if (mminit_loglevel < MMINIT_VERIFY)
27 return;
28
29 for_each_online_node(nid) {
30 pg_data_t *pgdat = NODE_DATA(nid);
31 struct zone *zone;
32 struct zoneref *z;
33 struct zonelist *zonelist;
34 int i, listid, zoneid;
35
36 BUG_ON(MAX_ZONELISTS > 2);
37 for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
38
39 /* Identify the zone and nodelist */
40 zoneid = i % MAX_NR_ZONES;
41 listid = i / MAX_NR_ZONES;
42 zonelist = &pgdat->node_zonelists[listid];
43 zone = &pgdat->node_zones[zoneid];
44 if (!populated_zone(zone))
45 continue;
46
47 /* Print information about the zonelist */
48 printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
49 listid > 0 ? "thisnode" : "general", nid,
50 zone->name);
51
52 /* Iterate the zonelist */
53 for_each_zone_zonelist(zone, z, zonelist, zoneid) {
54#ifdef CONFIG_NUMA
55 printk(KERN_CONT "%d:%s ",
56 zone->node, zone->name);
57#else
58 printk(KERN_CONT "0:%s ", zone->name);
59#endif /* CONFIG_NUMA */
60 }
61 printk(KERN_CONT "\n");
62 }
63 }
64}
65
66void __init mminit_verify_pageflags_layout(void)
67{
68 int shift, width;
69 unsigned long or_mask, add_mask;
70
71 shift = 8 * sizeof(unsigned long);
72 width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH - LAST_NID_SHIFT;
73 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
74 "Section %d Node %d Zone %d Lastnid %d Flags %d\n",
75 SECTIONS_WIDTH,
76 NODES_WIDTH,
77 ZONES_WIDTH,
78 LAST_NID_WIDTH,
79 NR_PAGEFLAGS);
80 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
81 "Section %d Node %d Zone %d Lastnid %d\n",
82 SECTIONS_SHIFT,
83 NODES_SHIFT,
84 ZONES_SHIFT,
85 LAST_NID_SHIFT);
86 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
87 "Section %lu Node %lu Zone %lu Lastnid %lu\n",
88 (unsigned long)SECTIONS_PGSHIFT,
89 (unsigned long)NODES_PGSHIFT,
90 (unsigned long)ZONES_PGSHIFT,
91 (unsigned long)LAST_NID_PGSHIFT);
92 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid",
93 "Node/Zone ID: %lu -> %lu\n",
94 (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT),
95 (unsigned long)ZONEID_PGOFF);
96 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
97 "location: %d -> %d layout %d -> %d unused %d -> %d page-flags\n",
98 shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
99#ifdef NODE_NOT_IN_PAGE_FLAGS
100 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
101 "Node not in page flags");
102#endif
103#ifdef LAST_NID_NOT_IN_PAGE_FLAGS
104 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
105 "Last nid not in page flags");
106#endif
107
108 if (SECTIONS_WIDTH) {
109 shift -= SECTIONS_WIDTH;
110 BUG_ON(shift != SECTIONS_PGSHIFT);
111 }
112 if (NODES_WIDTH) {
113 shift -= NODES_WIDTH;
114 BUG_ON(shift != NODES_PGSHIFT);
115 }
116 if (ZONES_WIDTH) {
117 shift -= ZONES_WIDTH;
118 BUG_ON(shift != ZONES_PGSHIFT);
119 }
120
121 /* Check for bitmask overlaps */
122 or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
123 (NODES_MASK << NODES_PGSHIFT) |
124 (SECTIONS_MASK << SECTIONS_PGSHIFT);
125 add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
126 (NODES_MASK << NODES_PGSHIFT) +
127 (SECTIONS_MASK << SECTIONS_PGSHIFT);
128 BUG_ON(or_mask != add_mask);
129}
130
131void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
132 unsigned long nid, unsigned long pfn)
133{
134 BUG_ON(page_to_nid(page) != nid);
135 BUG_ON(page_zonenum(page) != zone);
136 BUG_ON(page_to_pfn(page) != pfn);
137}
138
139static __init int set_mminit_loglevel(char *str)
140{
141 get_option(&str, &mminit_loglevel);
142 return 0;
143}
144early_param("mminit_loglevel", set_mminit_loglevel);
145#endif /* CONFIG_DEBUG_MEMORY_INIT */
146
147struct kobject *mm_kobj;
148EXPORT_SYMBOL_GPL(mm_kobj);
149
150static int __init mm_sysfs_init(void)
151{
152 mm_kobj = kobject_create_and_add("mm", kernel_kobj);
153 if (!mm_kobj)
154 return -ENOMEM;
155
156 return 0;
157}
158
159__initcall(mm_sysfs_init);