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Mel Gorman6b74ab92008-07-23 21:26:49 -07001/*
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>
Nishanth Aravamudanff7ea792008-07-23 21:27:39 -070010#include <linux/kobject.h>
Paul Gortmakerb95f1b312011-10-16 02:01:52 -040011#include <linux/export.h>
Tim Chen917d9292013-07-03 15:02:44 -070012#include <linux/memory.h>
13#include <linux/notifier.h>
Mel Gorman7e18adb2015-06-30 14:57:05 -070014#include <linux/sched.h>
Mel Gorman708614e2008-07-23 21:26:51 -070015#include "internal.h"
Mel Gorman6b74ab92008-07-23 21:26:49 -070016
Nishanth Aravamudan5e9426ab2008-07-23 21:27:39 -070017#ifdef CONFIG_DEBUG_MEMORY_INIT
Rasmus Villemoes194e8152015-02-12 15:00:12 -080018int __meminitdata mminit_loglevel;
Mel Gorman6b74ab92008-07-23 21:26:49 -070019
Andrew Morton5c9ffc92008-08-05 13:01:01 -070020#ifndef SECTIONS_SHIFT
21#define SECTIONS_SHIFT 0
22#endif
23
Mel Gorman68ad8df2008-07-23 21:26:52 -070024/* The zonelists are simply reported, validation is manual. */
Rasmus Villemoes0e2342c2015-02-12 15:00:09 -080025void __init mminit_verify_zonelist(void)
Mel Gorman68ad8df2008-07-23 21:26:52 -070026{
27 int nid;
28
29 if (mminit_loglevel < MMINIT_VERIFY)
30 return;
31
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;
38
39 BUG_ON(MAX_ZONELISTS > 2);
40 for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
41
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;
49
50 /* Print information about the zonelist */
51 printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
52 listid > 0 ? "thisnode" : "general", nid,
53 zone->name);
54
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 */
63 }
64 printk(KERN_CONT "\n");
65 }
66 }
67}
68
Mel Gorman708614e2008-07-23 21:26:51 -070069void __init mminit_verify_pageflags_layout(void)
70{
71 int shift, width;
72 unsigned long or_mask, add_mask;
73
74 shift = 8 * sizeof(unsigned long);
Peter Zijlstra90572892013-10-07 11:29:20 +010075 width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH - LAST_CPUPID_SHIFT;
Mel Gorman708614e2008-07-23 21:26:51 -070076 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
Peter Zijlstra90572892013-10-07 11:29:20 +010077 "Section %d Node %d Zone %d Lastcpupid %d Flags %d\n",
Mel Gorman708614e2008-07-23 21:26:51 -070078 SECTIONS_WIDTH,
79 NODES_WIDTH,
80 ZONES_WIDTH,
Peter Zijlstra90572892013-10-07 11:29:20 +010081 LAST_CPUPID_WIDTH,
Mel Gorman708614e2008-07-23 21:26:51 -070082 NR_PAGEFLAGS);
83 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
Peter Zijlstra90572892013-10-07 11:29:20 +010084 "Section %d Node %d Zone %d Lastcpupid %d\n",
Mel Gorman708614e2008-07-23 21:26:51 -070085 SECTIONS_SHIFT,
Mel Gorman708614e2008-07-23 21:26:51 -070086 NODES_SHIFT,
Mel Gormana4e1b4c2013-02-22 16:34:47 -080087 ZONES_SHIFT,
Peter Zijlstra90572892013-10-07 11:29:20 +010088 LAST_CPUPID_SHIFT);
Mel Gormana4e1b4c2013-02-22 16:34:47 -080089 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
Peter Zijlstra90572892013-10-07 11:29:20 +010090 "Section %lu Node %lu Zone %lu Lastcpupid %lu\n",
Mel Gorman708614e2008-07-23 21:26:51 -070091 (unsigned long)SECTIONS_PGSHIFT,
92 (unsigned long)NODES_PGSHIFT,
Mel Gormana4e1b4c2013-02-22 16:34:47 -080093 (unsigned long)ZONES_PGSHIFT,
Peter Zijlstra90572892013-10-07 11:29:20 +010094 (unsigned long)LAST_CPUPID_PGSHIFT);
Mel Gormana4e1b4c2013-02-22 16:34:47 -080095 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);
Mel Gorman708614e2008-07-23 21:26:51 -070099 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
Mel Gormana4e1b4c2013-02-22 16:34:47 -0800100 "location: %d -> %d layout %d -> %d unused %d -> %d page-flags\n",
Mel Gorman708614e2008-07-23 21:26:51 -0700101 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
Peter Zijlstra90572892013-10-07 11:29:20 +0100106#ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
Mel Gormana4e1b4c2013-02-22 16:34:47 -0800107 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
Peter Zijlstra90572892013-10-07 11:29:20 +0100108 "Last cpupid not in page flags");
Mel Gormana4e1b4c2013-02-22 16:34:47 -0800109#endif
Mel Gorman708614e2008-07-23 21:26:51 -0700110
111 if (SECTIONS_WIDTH) {
112 shift -= SECTIONS_WIDTH;
113 BUG_ON(shift != SECTIONS_PGSHIFT);
114 }
115 if (NODES_WIDTH) {
116 shift -= NODES_WIDTH;
117 BUG_ON(shift != NODES_PGSHIFT);
118 }
119 if (ZONES_WIDTH) {
120 shift -= ZONES_WIDTH;
121 BUG_ON(shift != ZONES_PGSHIFT);
122 }
123
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);
132}
133
Mel Gorman6b74ab92008-07-23 21:26:49 -0700134static __init int set_mminit_loglevel(char *str)
135{
136 get_option(&str, &mminit_loglevel);
137 return 0;
138}
139early_param("mminit_loglevel", set_mminit_loglevel);
Nishanth Aravamudan5e9426ab2008-07-23 21:27:39 -0700140#endif /* CONFIG_DEBUG_MEMORY_INIT */
Nishanth Aravamudanff7ea792008-07-23 21:27:39 -0700141
142struct kobject *mm_kobj;
143EXPORT_SYMBOL_GPL(mm_kobj);
144
Tim Chen917d9292013-07-03 15:02:44 -0700145#ifdef CONFIG_SMP
146s32 vm_committed_as_batch = 32;
147
148static void __meminit mm_compute_batch(void)
149{
150 u64 memsized_batch;
151 s32 nr = num_present_cpus();
152 s32 batch = max_t(s32, nr*2, 32);
153
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);
156
157 vm_committed_as_batch = max_t(s32, memsized_batch, batch);
158}
159
160static int __meminit mm_compute_batch_notifier(struct notifier_block *self,
161 unsigned long action, void *arg)
162{
163 switch (action) {
164 case MEM_ONLINE:
165 case MEM_OFFLINE:
166 mm_compute_batch();
167 default:
168 break;
169 }
170 return NOTIFY_OK;
171}
172
173static struct notifier_block compute_batch_nb __meminitdata = {
174 .notifier_call = mm_compute_batch_notifier,
175 .priority = IPC_CALLBACK_PRI, /* use lowest priority */
176};
177
178static int __init mm_compute_batch_init(void)
179{
180 mm_compute_batch();
181 register_hotmemory_notifier(&compute_batch_nb);
182
183 return 0;
184}
185
186__initcall(mm_compute_batch_init);
187
188#endif
189
Nishanth Aravamudanff7ea792008-07-23 21:27:39 -0700190static int __init mm_sysfs_init(void)
191{
192 mm_kobj = kobject_create_and_add("mm", kernel_kobj);
193 if (!mm_kobj)
194 return -ENOMEM;
195
196 return 0;
197}
Hugh Dickinse82cb952014-01-27 17:06:55 -0800198postcore_initcall(mm_sysfs_init);