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 <linux/sched.h> 15 #include "internal.h" 16 17 #ifdef CONFIG_DEBUG_MEMORY_INIT 18 int __meminitdata mminit_loglevel; 19 20 #ifndef SECTIONS_SHIFT 21 #define SECTIONS_SHIFT 0 22 #endif 23 24 /* The zonelists are simply reported, validation is manual. */ 25 void __init mminit_verify_zonelist(void) 26 { 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 69 void __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); 75 width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH - LAST_CPUPID_SHIFT; 76 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths", 77 "Section %d Node %d Zone %d Lastcpupid %d Flags %d\n", 78 SECTIONS_WIDTH, 79 NODES_WIDTH, 80 ZONES_WIDTH, 81 LAST_CPUPID_WIDTH, 82 NR_PAGEFLAGS); 83 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts", 84 "Section %d Node %d Zone %d Lastcpupid %d\n", 85 SECTIONS_SHIFT, 86 NODES_SHIFT, 87 ZONES_SHIFT, 88 LAST_CPUPID_SHIFT); 89 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts", 90 "Section %lu Node %lu Zone %lu Lastcpupid %lu\n", 91 (unsigned long)SECTIONS_PGSHIFT, 92 (unsigned long)NODES_PGSHIFT, 93 (unsigned long)ZONES_PGSHIFT, 94 (unsigned long)LAST_CPUPID_PGSHIFT); 95 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); 99 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage", 100 "location: %d -> %d layout %d -> %d unused %d -> %d page-flags\n", 101 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 106 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS 107 mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags", 108 "Last cpupid not in page flags"); 109 #endif 110 111 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 } 133 134 static __init int set_mminit_loglevel(char *str) 135 { 136 get_option(&str, &mminit_loglevel); 137 return 0; 138 } 139 early_param("mminit_loglevel", set_mminit_loglevel); 140 #endif /* CONFIG_DEBUG_MEMORY_INIT */ 141 142 struct kobject *mm_kobj; 143 EXPORT_SYMBOL_GPL(mm_kobj); 144 145 #ifdef CONFIG_SMP 146 s32 vm_committed_as_batch = 32; 147 148 static 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 } 159 160 static 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 } 172 173 static struct notifier_block compute_batch_nb __meminitdata = { 174 .notifier_call = mm_compute_batch_notifier, 175 .priority = IPC_CALLBACK_PRI, /* use lowest priority */ 176 }; 177 178 static 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 189 190 static 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 } 198 postcore_initcall(mm_sysfs_init); 199