Merge tag 'block-6.1-2022-12-08' of git://git.kernel.dk/linux
[platform/kernel/linux-starfive.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 <linux/mman.h>
17 #include "internal.h"
18
19 #ifdef CONFIG_DEBUG_MEMORY_INIT
20 int __meminitdata mminit_loglevel;
21
22 /* The zonelists are simply reported, validation is manual. */
23 void __init mminit_verify_zonelist(void)
24 {
25         int nid;
26
27         if (mminit_loglevel < MMINIT_VERIFY)
28                 return;
29
30         for_each_online_node(nid) {
31                 pg_data_t *pgdat = NODE_DATA(nid);
32                 struct zone *zone;
33                 struct zoneref *z;
34                 struct zonelist *zonelist;
35                 int i, listid, zoneid;
36
37                 BUILD_BUG_ON(MAX_ZONELISTS > 2);
38                 for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
39
40                         /* Identify the zone and nodelist */
41                         zoneid = i % MAX_NR_ZONES;
42                         listid = i / MAX_NR_ZONES;
43                         zonelist = &pgdat->node_zonelists[listid];
44                         zone = &pgdat->node_zones[zoneid];
45                         if (!populated_zone(zone))
46                                 continue;
47
48                         /* Print information about the zonelist */
49                         printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
50                                 listid > 0 ? "thisnode" : "general", nid,
51                                 zone->name);
52
53                         /* Iterate the zonelist */
54                         for_each_zone_zonelist(zone, z, zonelist, zoneid)
55                                 pr_cont("%d:%s ", zone_to_nid(zone), zone->name);
56                         pr_cont("\n");
57                 }
58         }
59 }
60
61 void __init mminit_verify_pageflags_layout(void)
62 {
63         int shift, width;
64         unsigned long or_mask, add_mask;
65
66         shift = 8 * sizeof(unsigned long);
67         width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH
68                 - LAST_CPUPID_SHIFT - KASAN_TAG_WIDTH - LRU_GEN_WIDTH - LRU_REFS_WIDTH;
69         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
70                 "Section %d Node %d Zone %d Lastcpupid %d Kasantag %d Gen %d Tier %d Flags %d\n",
71                 SECTIONS_WIDTH,
72                 NODES_WIDTH,
73                 ZONES_WIDTH,
74                 LAST_CPUPID_WIDTH,
75                 KASAN_TAG_WIDTH,
76                 LRU_GEN_WIDTH,
77                 LRU_REFS_WIDTH,
78                 NR_PAGEFLAGS);
79         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
80                 "Section %d Node %d Zone %d Lastcpupid %d Kasantag %d\n",
81                 SECTIONS_SHIFT,
82                 NODES_SHIFT,
83                 ZONES_SHIFT,
84                 LAST_CPUPID_SHIFT,
85                 KASAN_TAG_WIDTH);
86         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
87                 "Section %lu Node %lu Zone %lu Lastcpupid %lu Kasantag %lu\n",
88                 (unsigned long)SECTIONS_PGSHIFT,
89                 (unsigned long)NODES_PGSHIFT,
90                 (unsigned long)ZONES_PGSHIFT,
91                 (unsigned long)LAST_CPUPID_PGSHIFT,
92                 (unsigned long)KASAN_TAG_PGSHIFT);
93         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid",
94                 "Node/Zone ID: %lu -> %lu\n",
95                 (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT),
96                 (unsigned long)ZONEID_PGOFF);
97         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
98                 "location: %d -> %d layout %d -> %d unused %d -> %d page-flags\n",
99                 shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
100 #ifdef NODE_NOT_IN_PAGE_FLAGS
101         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
102                 "Node not in page flags");
103 #endif
104 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
105         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
106                 "Last cpupid not in page flags");
107 #endif
108
109         if (SECTIONS_WIDTH) {
110                 shift -= SECTIONS_WIDTH;
111                 BUG_ON(shift != SECTIONS_PGSHIFT);
112         }
113         if (NODES_WIDTH) {
114                 shift -= NODES_WIDTH;
115                 BUG_ON(shift != NODES_PGSHIFT);
116         }
117         if (ZONES_WIDTH) {
118                 shift -= ZONES_WIDTH;
119                 BUG_ON(shift != ZONES_PGSHIFT);
120         }
121
122         /* Check for bitmask overlaps */
123         or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
124                         (NODES_MASK << NODES_PGSHIFT) |
125                         (SECTIONS_MASK << SECTIONS_PGSHIFT);
126         add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
127                         (NODES_MASK << NODES_PGSHIFT) +
128                         (SECTIONS_MASK << SECTIONS_PGSHIFT);
129         BUG_ON(or_mask != add_mask);
130 }
131
132 static __init int set_mminit_loglevel(char *str)
133 {
134         get_option(&str, &mminit_loglevel);
135         return 0;
136 }
137 early_param("mminit_loglevel", set_mminit_loglevel);
138 #endif /* CONFIG_DEBUG_MEMORY_INIT */
139
140 struct kobject *mm_kobj;
141 EXPORT_SYMBOL_GPL(mm_kobj);
142
143 #ifdef CONFIG_SMP
144 s32 vm_committed_as_batch = 32;
145
146 void mm_compute_batch(int overcommit_policy)
147 {
148         u64 memsized_batch;
149         s32 nr = num_present_cpus();
150         s32 batch = max_t(s32, nr*2, 32);
151         unsigned long ram_pages = totalram_pages();
152
153         /*
154          * For policy OVERCOMMIT_NEVER, set batch size to 0.4% of
155          * (total memory/#cpus), and lift it to 25% for other policies
156          * to easy the possible lock contention for percpu_counter
157          * vm_committed_as, while the max limit is INT_MAX
158          */
159         if (overcommit_policy == OVERCOMMIT_NEVER)
160                 memsized_batch = min_t(u64, ram_pages/nr/256, INT_MAX);
161         else
162                 memsized_batch = min_t(u64, ram_pages/nr/4, INT_MAX);
163
164         vm_committed_as_batch = max_t(s32, memsized_batch, batch);
165 }
166
167 static 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(sysctl_overcommit_memory);
174                 break;
175         default:
176                 break;
177         }
178         return NOTIFY_OK;
179 }
180
181 static struct notifier_block compute_batch_nb __meminitdata = {
182         .notifier_call = mm_compute_batch_notifier,
183         .priority = IPC_CALLBACK_PRI, /* use lowest priority */
184 };
185
186 static int __init mm_compute_batch_init(void)
187 {
188         mm_compute_batch(sysctl_overcommit_memory);
189         register_hotmemory_notifier(&compute_batch_nb);
190
191         return 0;
192 }
193
194 __initcall(mm_compute_batch_init);
195
196 #endif
197
198 static int __init mm_sysfs_init(void)
199 {
200         mm_kobj = kobject_create_and_add("mm", kernel_kobj);
201         if (!mm_kobj)
202                 return -ENOMEM;
203
204         return 0;
205 }
206 postcore_initcall(mm_sysfs_init);