Root/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
17int mminit_loglevel;
18
19#ifndef SECTIONS_SHIFT
20#define SECTIONS_SHIFT 0
21#endif
22
23/* The zonelists are simply reported, validation is manual. */
24void 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
68void __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_NID_SHIFT;
75    mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
76        "Section %d Node %d Zone %d Lastnid %d Flags %d\n",
77        SECTIONS_WIDTH,
78        NODES_WIDTH,
79        ZONES_WIDTH,
80        LAST_NID_WIDTH,
81        NR_PAGEFLAGS);
82    mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
83        "Section %d Node %d Zone %d Lastnid %d\n",
84        SECTIONS_SHIFT,
85        NODES_SHIFT,
86        ZONES_SHIFT,
87        LAST_NID_SHIFT);
88    mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
89        "Section %lu Node %lu Zone %lu Lastnid %lu\n",
90        (unsigned long)SECTIONS_PGSHIFT,
91        (unsigned long)NODES_PGSHIFT,
92        (unsigned long)ZONES_PGSHIFT,
93        (unsigned long)LAST_NID_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_NID_NOT_IN_PAGE_FLAGS
106    mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
107        "Last nid 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
133void __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
141static __init int set_mminit_loglevel(char *str)
142{
143    get_option(&str, &mminit_loglevel);
144    return 0;
145}
146early_param("mminit_loglevel", set_mminit_loglevel);
147#endif /* CONFIG_DEBUG_MEMORY_INIT */
148
149struct kobject *mm_kobj;
150EXPORT_SYMBOL_GPL(mm_kobj);
151
152#ifdef CONFIG_SMP
153s32 vm_committed_as_batch = 32;
154
155static 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
167static 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
180static struct notifier_block compute_batch_nb __meminitdata = {
181    .notifier_call = mm_compute_batch_notifier,
182    .priority = IPC_CALLBACK_PRI, /* use lowest priority */
183};
184
185static 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
197static 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
206__initcall(mm_sysfs_init);
207

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