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Linux/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 <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                                 pr_cont("%d:%s ", zone->node, zone->name);
 59 #else
 60                                 pr_cont("0:%s ", zone->name);
 61 #endif /* CONFIG_NUMA */
 62                         }
 63                         pr_cont("\n");
 64                 }
 65         }
 66 }
 67 
 68 void __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_CPUPID_SHIFT;
 75         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
 76                 "Section %d Node %d Zone %d Lastcpupid %d Flags %d\n",
 77                 SECTIONS_WIDTH,
 78                 NODES_WIDTH,
 79                 ZONES_WIDTH,
 80                 LAST_CPUPID_WIDTH,
 81                 NR_PAGEFLAGS);
 82         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
 83                 "Section %d Node %d Zone %d Lastcpupid %d\n",
 84                 SECTIONS_SHIFT,
 85                 NODES_SHIFT,
 86                 ZONES_SHIFT,
 87                 LAST_CPUPID_SHIFT);
 88         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
 89                 "Section %lu Node %lu Zone %lu Lastcpupid %lu\n",
 90                 (unsigned long)SECTIONS_PGSHIFT,
 91                 (unsigned long)NODES_PGSHIFT,
 92                 (unsigned long)ZONES_PGSHIFT,
 93                 (unsigned long)LAST_CPUPID_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_CPUPID_NOT_IN_PAGE_FLAGS
106         mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
107                 "Last cpupid 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 
133 static __init int set_mminit_loglevel(char *str)
134 {
135         get_option(&str, &mminit_loglevel);
136         return 0;
137 }
138 early_param("mminit_loglevel", set_mminit_loglevel);
139 #endif /* CONFIG_DEBUG_MEMORY_INIT */
140 
141 struct kobject *mm_kobj;
142 EXPORT_SYMBOL_GPL(mm_kobj);
143 
144 #ifdef CONFIG_SMP
145 s32 vm_committed_as_batch = 32;
146 
147 static void __meminit mm_compute_batch(void)
148 {
149         u64 memsized_batch;
150         s32 nr = num_present_cpus();
151         s32 batch = max_t(s32, nr*2, 32);
152 
153         /* batch size set to 0.4% of (total memory/#cpus), or max int32 */
154         memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff);
155 
156         vm_committed_as_batch = max_t(s32, memsized_batch, batch);
157 }
158 
159 static int __meminit mm_compute_batch_notifier(struct notifier_block *self,
160                                         unsigned long action, void *arg)
161 {
162         switch (action) {
163         case MEM_ONLINE:
164         case MEM_OFFLINE:
165                 mm_compute_batch();
166         default:
167                 break;
168         }
169         return NOTIFY_OK;
170 }
171 
172 static struct notifier_block compute_batch_nb __meminitdata = {
173         .notifier_call = mm_compute_batch_notifier,
174         .priority = IPC_CALLBACK_PRI, /* use lowest priority */
175 };
176 
177 static int __init mm_compute_batch_init(void)
178 {
179         mm_compute_batch();
180         register_hotmemory_notifier(&compute_batch_nb);
181 
182         return 0;
183 }
184 
185 __initcall(mm_compute_batch_init);
186 
187 #endif
188 
189 static int __init mm_sysfs_init(void)
190 {
191         mm_kobj = kobject_create_and_add("mm", kernel_kobj);
192         if (!mm_kobj)
193                 return -ENOMEM;
194 
195         return 0;
196 }
197 postcore_initcall(mm_sysfs_init);
198 

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