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