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 "internal.h" 17 18 #ifdef CONFIG_DEBUG_MEMORY_INIT 19 int __meminitdata mminit_loglevel; 20 21 #ifndef SECTIONS_SHIFT 22 #define SECTIONS_SHIFT 0 23 #endif 24 25 /* The zonelists are simply reported, validation is manual. */ 26 void __init mminit_verify_zonelist(void) 27 { 28 int nid; 29 30 if (mminit_loglevel < MMINIT_VERIFY) 31 return; 32 33 for_each_online_node(nid) { 34 pg_data_t *pgdat = NODE_DATA(nid); 35 struct zone *zone; 36 struct zoneref *z; 37 struct zonelist *zonelist; 38 int i, listid, zoneid; 39 40 BUILD_BUG_ON(MAX_ZONELISTS > 2); 41 for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) { 42 43 /* Identify the zone and nodelist */ 44 zoneid = i % MAX_NR_ZONES; 45 listid = i / MAX_NR_ZONES; 46 zonelist = &pgdat->node_zonelists[listid]; 47 zone = &pgdat->node_zones[zoneid]; 48 if (!populated_zone(zone)) 49 continue; 50 51 /* Print information about the zonelist */ 52 printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ", 53 listid > 0 ? "thisnode" : "general", nid, 54 zone->name); 55 56 /* Iterate the zonelist */ 57 for_each_zone_zonelist(zone, z, zonelist, zoneid) 58 pr_cont("%d:%s ", zone_to_nid(zone), zone->name); 59 pr_cont("\n"); 60 } 61 } 62 } 63 64 void __init mminit_verify_pageflags_layout(void) 65 { 66 int shift, width; 67 unsigned long or_mask, add_mask; 68 69 shift = 8 * sizeof(unsigned long); 70 width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH - LAST_CPUPID_SHIFT; 71 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths", 72 "Section %d Node %d Zone %d Lastcpupid %d Flags %d\n", 73 SECTIONS_WIDTH, 74 NODES_WIDTH, 75 ZONES_WIDTH, 76 LAST_CPUPID_WIDTH, 77 NR_PAGEFLAGS); 78 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts", 79 "Section %d Node %d Zone %d Lastcpupid %d\n", 80 SECTIONS_SHIFT, 81 NODES_SHIFT, 82 ZONES_SHIFT, 83 LAST_CPUPID_SHIFT); 84 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts", 85 "Section %lu Node %lu Zone %lu Lastcpupid %lu\n", 86 (unsigned long)SECTIONS_PGSHIFT, 87 (unsigned long)NODES_PGSHIFT, 88 (unsigned long)ZONES_PGSHIFT, 89 (unsigned long)LAST_CPUPID_PGSHIFT); 90 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid", 91 "Node/Zone ID: %lu -> %lu\n", 92 (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT), 93 (unsigned long)ZONEID_PGOFF); 94 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage", 95 "location: %d -> %d layout %d -> %d unused %d -> %d page-flags\n", 96 shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0); 97 #ifdef NODE_NOT_IN_PAGE_FLAGS 98 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags", 99 "Node not in page flags"); 100 #endif 101 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS 102 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags", 103 "Last cpupid not in page flags"); 104 #endif 105 106 if (SECTIONS_WIDTH) { 107 shift -= SECTIONS_WIDTH; 108 BUG_ON(shift != SECTIONS_PGSHIFT); 109 } 110 if (NODES_WIDTH) { 111 shift -= NODES_WIDTH; 112 BUG_ON(shift != NODES_PGSHIFT); 113 } 114 if (ZONES_WIDTH) { 115 shift -= ZONES_WIDTH; 116 BUG_ON(shift != ZONES_PGSHIFT); 117 } 118 119 /* Check for bitmask overlaps */ 120 or_mask = (ZONES_MASK << ZONES_PGSHIFT) | 121 (NODES_MASK << NODES_PGSHIFT) | 122 (SECTIONS_MASK << SECTIONS_PGSHIFT); 123 add_mask = (ZONES_MASK << ZONES_PGSHIFT) + 124 (NODES_MASK << NODES_PGSHIFT) + 125 (SECTIONS_MASK << SECTIONS_PGSHIFT); 126 BUG_ON(or_mask != add_mask); 127 } 128 129 static __init int set_mminit_loglevel(char *str) 130 { 131 get_option(&str, &mminit_loglevel); 132 return 0; 133 } 134 early_param("mminit_loglevel", set_mminit_loglevel); 135 #endif /* CONFIG_DEBUG_MEMORY_INIT */ 136 137 struct kobject *mm_kobj; 138 EXPORT_SYMBOL_GPL(mm_kobj); 139 140 #ifdef CONFIG_SMP 141 s32 vm_committed_as_batch = 32; 142 143 static void __meminit mm_compute_batch(void) 144 { 145 u64 memsized_batch; 146 s32 nr = num_present_cpus(); 147 s32 batch = max_t(s32, nr*2, 32); 148 149 /* batch size set to 0.4% of (total memory/#cpus), or max int32 */ 150 memsized_batch = min_t(u64, (totalram_pages()/nr)/256, 0x7fffffff); 151 152 vm_committed_as_batch = max_t(s32, memsized_batch, batch); 153 } 154 155 static int __meminit mm_compute_batch_notifier(struct notifier_block *self, 156 unsigned long action, void *arg) 157 { 158 switch (action) { 159 case MEM_ONLINE: 160 case MEM_OFFLINE: 161 mm_compute_batch(); 162 default: 163 break; 164 } 165 return NOTIFY_OK; 166 } 167 168 static struct notifier_block compute_batch_nb __meminitdata = { 169 .notifier_call = mm_compute_batch_notifier, 170 .priority = IPC_CALLBACK_PRI, /* use lowest priority */ 171 }; 172 173 static int __init mm_compute_batch_init(void) 174 { 175 mm_compute_batch(); 176 register_hotmemory_notifier(&compute_batch_nb); 177 178 return 0; 179 } 180 181 __initcall(mm_compute_batch_init); 182 183 #endif 184 185 static int __init mm_sysfs_init(void) 186 { 187 mm_kobj = kobject_create_and_add("mm", kernel_kobj); 188 if (!mm_kobj) 189 return -ENOMEM; 190 191 return 0; 192 } 193 postcore_initcall(mm_sysfs_init); 194