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Linux/mm/mm_init.c

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  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 "internal.h"
 15 
 16 #ifdef CONFIG_DEBUG_MEMORY_INIT
 17 int mminit_loglevel;
 18 
 19 #ifndef SECTIONS_SHIFT
 20 #define SECTIONS_SHIFT  0
 21 #endif
 22 
 23 /* The zonelists are simply reported, validation is manual. */
 24 void mminit_verify_zonelist(void)
 25 {
 26         int nid;
 27 
 28         if (mminit_loglevel < MMINIT_VERIFY)
 29                 return;
 30 
 31         for_each_online_node(nid) {
 32                 pg_data_t *pgdat = NODE_DATA(nid);
 33                 struct zone *zone;
 34                 struct zoneref *z;
 35                 struct zonelist *zonelist;
 36                 int i, listid, zoneid;
 37 
 38                 BUG_ON(MAX_ZONELISTS > 2);
 39                 for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
 40 
 41                         /* Identify the zone and nodelist */
 42                         zoneid = i % MAX_NR_ZONES;
 43                         listid = i / MAX_NR_ZONES;
 44                         zonelist = &pgdat->node_zonelists[listid];
 45                         zone = &pgdat->node_zones[zoneid];
 46                         if (!populated_zone(zone))
 47                                 continue;
 48 
 49                         /* Print information about the zonelist */
 50                         printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
 51                                 listid > 0 ? "thisnode" : "general", nid,
 52                                 zone->name);
 53 
 54                         /* Iterate the zonelist */
 55                         for_each_zone_zonelist(zone, z, zonelist, zoneid) {
 56 #ifdef CONFIG_NUMA
 57                                 printk(KERN_CONT "%d:%s ",
 58                                         zone->node, zone->name);
 59 #else
 60                                 printk(KERN_CONT "0:%s ", zone->name);
 61 #endif /* CONFIG_NUMA */
 62                         }
 63                         printk(KERN_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 void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
134                         unsigned long nid, unsigned long pfn)
135 {
136         BUG_ON(page_to_nid(page) != nid);
137         BUG_ON(page_zonenum(page) != zone);
138         BUG_ON(page_to_pfn(page) != pfn);
139 }
140 
141 static __init int set_mminit_loglevel(char *str)
142 {
143         get_option(&str, &mminit_loglevel);
144         return 0;
145 }
146 early_param("mminit_loglevel", set_mminit_loglevel);
147 #endif /* CONFIG_DEBUG_MEMORY_INIT */
148 
149 struct kobject *mm_kobj;
150 EXPORT_SYMBOL_GPL(mm_kobj);
151 
152 #ifdef CONFIG_SMP
153 s32 vm_committed_as_batch = 32;
154 
155 static void __meminit mm_compute_batch(void)
156 {
157         u64 memsized_batch;
158         s32 nr = num_present_cpus();
159         s32 batch = max_t(s32, nr*2, 32);
160 
161         /* batch size set to 0.4% of (total memory/#cpus), or max int32 */
162         memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff);
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();
174         default:
175                 break;
176         }
177         return NOTIFY_OK;
178 }
179 
180 static struct notifier_block compute_batch_nb __meminitdata = {
181         .notifier_call = mm_compute_batch_notifier,
182         .priority = IPC_CALLBACK_PRI, /* use lowest priority */
183 };
184 
185 static int __init mm_compute_batch_init(void)
186 {
187         mm_compute_batch();
188         register_hotmemory_notifier(&compute_batch_nb);
189 
190         return 0;
191 }
192 
193 __initcall(mm_compute_batch_init);
194 
195 #endif
196 
197 static int __init mm_sysfs_init(void)
198 {
199         mm_kobj = kobject_create_and_add("mm", kernel_kobj);
200         if (!mm_kobj)
201                 return -ENOMEM;
202 
203         return 0;
204 }
205 postcore_initcall(mm_sysfs_init);
206 

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