153 lines
3.7 KiB
C
153 lines
3.7 KiB
C
/*
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* mm_init.c - Memory initialisation verification and debugging
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*
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* Copyright 2008 IBM Corporation, 2008
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* Author Mel Gorman <mel@csn.ul.ie>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/kobject.h>
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#include <linux/module.h>
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#include "internal.h"
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#ifdef CONFIG_DEBUG_MEMORY_INIT
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int mminit_loglevel;
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#ifndef SECTIONS_SHIFT
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#define SECTIONS_SHIFT 0
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#endif
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/* The zonelists are simply reported, validation is manual. */
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void mminit_verify_zonelist(void)
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{
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int nid;
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if (mminit_loglevel < MMINIT_VERIFY)
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return;
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for_each_online_node(nid) {
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pg_data_t *pgdat = NODE_DATA(nid);
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struct zone *zone;
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struct zoneref *z;
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struct zonelist *zonelist;
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int i, listid, zoneid;
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BUG_ON(MAX_ZONELISTS > 2);
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for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
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/* Identify the zone and nodelist */
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zoneid = i % MAX_NR_ZONES;
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listid = i / MAX_NR_ZONES;
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zonelist = &pgdat->node_zonelists[listid];
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zone = &pgdat->node_zones[zoneid];
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if (!populated_zone(zone))
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continue;
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/* Print information about the zonelist */
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printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
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listid > 0 ? "thisnode" : "general", nid,
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zone->name);
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/* Iterate the zonelist */
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for_each_zone_zonelist(zone, z, zonelist, zoneid) {
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#ifdef CONFIG_NUMA
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printk(KERN_CONT "%d:%s ",
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zone->node, zone->name);
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#else
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printk(KERN_CONT "0:%s ", zone->name);
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#endif /* CONFIG_NUMA */
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}
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printk(KERN_CONT "\n");
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}
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}
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}
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void __init mminit_verify_pageflags_layout(void)
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{
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int shift, width;
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unsigned long or_mask, add_mask;
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shift = 8 * sizeof(unsigned long);
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width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH;
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
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"Section %d Node %d Zone %d Flags %d\n",
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SECTIONS_WIDTH,
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NODES_WIDTH,
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ZONES_WIDTH,
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NR_PAGEFLAGS);
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
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"Section %d Node %d Zone %d\n",
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SECTIONS_SHIFT,
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NODES_SHIFT,
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ZONES_SHIFT);
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_offsets",
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"Section %lu Node %lu Zone %lu\n",
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(unsigned long)SECTIONS_PGSHIFT,
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(unsigned long)NODES_PGSHIFT,
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(unsigned long)ZONES_PGSHIFT);
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_zoneid",
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"Zone ID: %lu -> %lu\n",
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(unsigned long)ZONEID_PGOFF,
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(unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT));
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
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"location: %d -> %d unused %d -> %d flags %d -> %d\n",
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shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
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#ifdef NODE_NOT_IN_PAGE_FLAGS
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mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
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"Node not in page flags");
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#endif
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if (SECTIONS_WIDTH) {
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shift -= SECTIONS_WIDTH;
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BUG_ON(shift != SECTIONS_PGSHIFT);
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}
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if (NODES_WIDTH) {
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shift -= NODES_WIDTH;
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BUG_ON(shift != NODES_PGSHIFT);
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}
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if (ZONES_WIDTH) {
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shift -= ZONES_WIDTH;
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BUG_ON(shift != ZONES_PGSHIFT);
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}
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/* Check for bitmask overlaps */
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or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
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(NODES_MASK << NODES_PGSHIFT) |
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(SECTIONS_MASK << SECTIONS_PGSHIFT);
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add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
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(NODES_MASK << NODES_PGSHIFT) +
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(SECTIONS_MASK << SECTIONS_PGSHIFT);
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BUG_ON(or_mask != add_mask);
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}
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void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
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unsigned long nid, unsigned long pfn)
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{
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BUG_ON(page_to_nid(page) != nid);
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BUG_ON(page_zonenum(page) != zone);
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BUG_ON(page_to_pfn(page) != pfn);
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}
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static __init int set_mminit_loglevel(char *str)
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{
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get_option(&str, &mminit_loglevel);
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return 0;
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}
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early_param("mminit_loglevel", set_mminit_loglevel);
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#endif /* CONFIG_DEBUG_MEMORY_INIT */
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struct kobject *mm_kobj;
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EXPORT_SYMBOL_GPL(mm_kobj);
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static int __init mm_sysfs_init(void)
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{
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mm_kobj = kobject_create_and_add("mm", kernel_kobj);
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if (!mm_kobj)
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return -ENOMEM;
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return 0;
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}
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__initcall(mm_sysfs_init);
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