/* * mm_init.c - Memory initialisation verification and debugging * * Copyright 2008 IBM Corporation, 2008 * Author Mel Gorman <mel@csn.ul.ie> * */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/kobject.h> #include <linux/export.h> #include <linux/memory.h> #include <linux/notifier.h> #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 - LAST_CPUPID_SHIFT; mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths", "Section %d Node %d Zone %d Lastcpupid %d Flags %d\n", SECTIONS_WIDTH, NODES_WIDTH, ZONES_WIDTH, LAST_CPUPID_WIDTH, NR_PAGEFLAGS); mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts", "Section %d Node %d Zone %d Lastcpupid %d\n", SECTIONS_SHIFT, NODES_SHIFT, ZONES_SHIFT, LAST_CPUPID_SHIFT); mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts", "Section %lu Node %lu Zone %lu Lastcpupid %lu\n", (unsigned long)SECTIONS_PGSHIFT, (unsigned long)NODES_PGSHIFT, (unsigned long)ZONES_PGSHIFT, (unsigned long)LAST_CPUPID_PGSHIFT); mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid", "Node/Zone ID: %lu -> %lu\n", (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT), (unsigned long)ZONEID_PGOFF); mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage", "location: %d -> %d layout %d -> %d unused %d -> %d page-flags\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 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags", "Last cpupid 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 << ZONES_PGSHIFT) | (NODES_MASK << NODES_PGSHIFT) | (SECTIONS_MASK << SECTIONS_PGSHIFT); add_mask = (ZONES_MASK << ZONES_PGSHIFT) + (NODES_MASK << NODES_PGSHIFT) + (SECTIONS_MASK << SECTIONS_PGSHIFT); 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); #ifdef CONFIG_SMP s32 vm_committed_as_batch = 32; static void __meminit mm_compute_batch(void) { u64 memsized_batch; s32 nr = num_present_cpus(); s32 batch = max_t(s32, nr*2, 32); /* batch size set to 0.4% of (total memory/#cpus), or max int32 */ memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff); vm_committed_as_batch = max_t(s32, memsized_batch, batch); } static int __meminit mm_compute_batch_notifier(struct notifier_block *self, unsigned long action, void *arg) { switch (action) { case MEM_ONLINE: case MEM_OFFLINE: mm_compute_batch(); default: break; } return NOTIFY_OK; } static struct notifier_block compute_batch_nb __meminitdata = { .notifier_call = mm_compute_batch_notifier, .priority = IPC_CALLBACK_PRI, /* use lowest priority */ }; static int __init mm_compute_batch_init(void) { mm_compute_batch(); register_hotmemory_notifier(&compute_batch_nb); return 0; } __initcall(mm_compute_batch_init); #endif 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);