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 "internal.h"
  13
  14#ifdef CONFIG_DEBUG_MEMORY_INIT
  15int mminit_loglevel;
  16
  17#ifndef SECTIONS_SHIFT
  18#define SECTIONS_SHIFT  0
  19#endif
  20
  21/* The zonelists are simply reported, validation is manual. */
  22void mminit_verify_zonelist(void)
  23{
  24        int nid;
  25
  26        if (mminit_loglevel < MMINIT_VERIFY)
  27                return;
  28
  29        for_each_online_node(nid) {
  30                pg_data_t *pgdat = NODE_DATA(nid);
  31                struct zone *zone;
  32                struct zoneref *z;
  33                struct zonelist *zonelist;
  34                int i, listid, zoneid;
  35
  36                BUG_ON(MAX_ZONELISTS > 2);
  37                for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
  38
  39                        /* Identify the zone and nodelist */
  40                        zoneid = i % MAX_NR_ZONES;
  41                        listid = i / MAX_NR_ZONES;
  42                        zonelist = &pgdat->node_zonelists[listid];
  43                        zone = &pgdat->node_zones[zoneid];
  44                        if (!populated_zone(zone))
  45                                continue;
  46
  47                        /* Print information about the zonelist */
  48                        printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
  49                                listid > 0 ? "thisnode" : "general", nid,
  50                                zone->name);
  51
  52                        /* Iterate the zonelist */
  53                        for_each_zone_zonelist(zone, z, zonelist, zoneid) {
  54#ifdef CONFIG_NUMA
  55                                printk(KERN_CONT "%d:%s ",
  56                                        zone->node, zone->name);
  57#else
  58                                printk(KERN_CONT "0:%s ", zone->name);
  59#endif /* CONFIG_NUMA */
  60                        }
  61                        printk(KERN_CONT "\n");
  62                }
  63        }
  64}
  65
  66void __init mminit_verify_pageflags_layout(void)
  67{
  68        int shift, width;
  69        unsigned long or_mask, add_mask;
  70
  71        shift = 8 * sizeof(unsigned long);
  72        width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH - LAST_NID_SHIFT;
  73        mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
  74                "Section %d Node %d Zone %d Lastnid %d Flags %d\n",
  75                SECTIONS_WIDTH,
  76                NODES_WIDTH,
  77                ZONES_WIDTH,
  78                LAST_NID_WIDTH,
  79                NR_PAGEFLAGS);
  80        mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
  81                "Section %d Node %d Zone %d Lastnid %d\n",
  82                SECTIONS_SHIFT,
  83                NODES_SHIFT,
  84                ZONES_SHIFT,
  85                LAST_NID_SHIFT);
  86        mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
  87                "Section %lu Node %lu Zone %lu Lastnid %lu\n",
  88                (unsigned long)SECTIONS_PGSHIFT,
  89                (unsigned long)NODES_PGSHIFT,
  90                (unsigned long)ZONES_PGSHIFT,
  91                (unsigned long)LAST_NID_PGSHIFT);
  92        mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid",
  93                "Node/Zone ID: %lu -> %lu\n",
  94                (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT),
  95                (unsigned long)ZONEID_PGOFF);
  96        mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
  97                "location: %d -> %d layout %d -> %d unused %d -> %d page-flags\n",
  98                shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
  99#ifdef NODE_NOT_IN_PAGE_FLAGS
 100        mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
 101                "Node not in page flags");
 102#endif
 103#ifdef LAST_NID_NOT_IN_PAGE_FLAGS
 104        mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
 105                "Last nid not in page flags");
 106#endif
 107
 108        if (SECTIONS_WIDTH) {
 109                shift -= SECTIONS_WIDTH;
 110                BUG_ON(shift != SECTIONS_PGSHIFT);
 111        }
 112        if (NODES_WIDTH) {
 113                shift -= NODES_WIDTH;
 114                BUG_ON(shift != NODES_PGSHIFT);
 115        }
 116        if (ZONES_WIDTH) {
 117                shift -= ZONES_WIDTH;
 118                BUG_ON(shift != ZONES_PGSHIFT);
 119        }
 120
 121        /* Check for bitmask overlaps */
 122        or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
 123                        (NODES_MASK << NODES_PGSHIFT) |
 124                        (SECTIONS_MASK << SECTIONS_PGSHIFT);
 125        add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
 126                        (NODES_MASK << NODES_PGSHIFT) +
 127                        (SECTIONS_MASK << SECTIONS_PGSHIFT);
 128        BUG_ON(or_mask != add_mask);
 129}
 130
 131void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
 132                        unsigned long nid, unsigned long pfn)
 133{
 134        BUG_ON(page_to_nid(page) != nid);
 135        BUG_ON(page_zonenum(page) != zone);
 136        BUG_ON(page_to_pfn(page) != pfn);
 137}
 138
 139static __init int set_mminit_loglevel(char *str)
 140{
 141        get_option(&str, &mminit_loglevel);
 142        return 0;
 143}
 144early_param("mminit_loglevel", set_mminit_loglevel);
 145#endif /* CONFIG_DEBUG_MEMORY_INIT */
 146
 147struct kobject *mm_kobj;
 148EXPORT_SYMBOL_GPL(mm_kobj);
 149
 150static int __init mm_sysfs_init(void)
 151{
 152        mm_kobj = kobject_create_and_add("mm", kernel_kobj);
 153        if (!mm_kobj)
 154                return -ENOMEM;
 155
 156        return 0;
 157}
 158
 159__initcall(mm_sysfs_init);
 160
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