[thirdparty/kernel/stable.git] / mm / mm_init.c

/*
 * 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 "internal.h"

int __meminitdata mminit_loglevel;

/* 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",
#ifdef SECTIONS_SHIFT
		SECTIONS_SHIFT,
#else
		0,
#endif
		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 << 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);
Commit	Line	Data
6b74ab97 MG	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>
708614e6	10	#include "internal.h"
6b74ab97 MG	11
	12	int __meminitdata mminit_loglevel;
	13
68ad8df4 MG	14	/* The zonelists are simply reported, validation is manual. */
	15	void mminit_verify_zonelist(void)
	16	{
	17	int nid;
	18
	19	if (mminit_loglevel < MMINIT_VERIFY)
	20	return;
	21
	22	for_each_online_node(nid) {
	23	pg_data_t *pgdat = NODE_DATA(nid);
	24	struct zone *zone;
	25	struct zoneref *z;
	26	struct zonelist *zonelist;
	27	int i, listid, zoneid;
	28
	29	BUG_ON(MAX_ZONELISTS > 2);
	30	for (i = 0; i < MAX_ZONELISTS * MAX_NR_ZONES; i++) {
	31
	32	/* Identify the zone and nodelist */
	33	zoneid = i % MAX_NR_ZONES;
	34	listid = i / MAX_NR_ZONES;
	35	zonelist = &pgdat->node_zonelists[listid];
	36	zone = &pgdat->node_zones[zoneid];
	37	if (!populated_zone(zone))
	38	continue;
	39
	40	/* Print information about the zonelist */
	41	printk(KERN_DEBUG "mminit::zonelist %s %d:%s = ",
	42	listid > 0 ? "thisnode" : "general", nid,
	43	zone->name);
	44
	45	/* Iterate the zonelist */
	46	for_each_zone_zonelist(zone, z, zonelist, zoneid) {
	47	#ifdef CONFIG_NUMA
	48	printk(KERN_CONT "%d:%s ",
	49	zone->node, zone->name);
	50	#else
	51	printk(KERN_CONT "0:%s ", zone->name);
	52	#endif /* CONFIG_NUMA */
	53	}
	54	printk(KERN_CONT "\n");
	55	}
	56	}
	57	}
	58
708614e6 MG	59	void __init mminit_verify_pageflags_layout(void)
	60	{
	61	int shift, width;
	62	unsigned long or_mask, add_mask;
	63
	64	shift = 8 * sizeof(unsigned long);
	65	width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH;
	66	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
	67	"Section %d Node %d Zone %d Flags %d\n",
	68	SECTIONS_WIDTH,
	69	NODES_WIDTH,
	70	ZONES_WIDTH,
	71	NR_PAGEFLAGS);
	72	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
	73	"Section %d Node %d Zone %d\n",
	74	#ifdef SECTIONS_SHIFT
	75	SECTIONS_SHIFT,
	76	#else
	77	0,
	78	#endif
	79	NODES_SHIFT,
	80	ZONES_SHIFT);
	81	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_offsets",
	82	"Section %lu Node %lu Zone %lu\n",
	83	(unsigned long)SECTIONS_PGSHIFT,
	84	(unsigned long)NODES_PGSHIFT,
	85	(unsigned long)ZONES_PGSHIFT);
	86	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_zoneid",
	87	"Zone ID: %lu -> %lu\n",
	88	(unsigned long)ZONEID_PGOFF,
	89	(unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT));
	90	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
	91	"location: %d -> %d unused %d -> %d flags %d -> %d\n",
	92	shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
	93	#ifdef NODE_NOT_IN_PAGE_FLAGS
	94	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
	95	"Node not in page flags");
	96	#endif
	97
	98	if (SECTIONS_WIDTH) {
	99	shift -= SECTIONS_WIDTH;
	100	BUG_ON(shift != SECTIONS_PGSHIFT);
	101	}
	102	if (NODES_WIDTH) {
	103	shift -= NODES_WIDTH;
	104	BUG_ON(shift != NODES_PGSHIFT);
	105	}
	106	if (ZONES_WIDTH) {
	107	shift -= ZONES_WIDTH;
	108	BUG_ON(shift != ZONES_PGSHIFT);
	109	}
	110
	111	/* Check for bitmask overlaps */
	112	or_mask = (ZONES_MASK << ZONES_PGSHIFT) \|
	113	(NODES_MASK << NODES_PGSHIFT) \|
	114	(SECTIONS_MASK << SECTIONS_PGSHIFT);
	115	add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
	116	(NODES_MASK << NODES_PGSHIFT) +
	117	(SECTIONS_MASK << SECTIONS_PGSHIFT);
	118	BUG_ON(or_mask != add_mask);
	119	}
	120
	121	void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
	122	unsigned long nid, unsigned long pfn)
123	{
124	BUG_ON(page_to_nid(page) != nid);
125	BUG_ON(page_zonenum(page) != zone);
126	BUG_ON(page_to_pfn(page) != pfn);
127	}
128
6b74ab97 MG	129	static __init int set_mminit_loglevel(char *str)
	130	{
	131	get_option(&str, &mminit_loglevel);
	132	return 0;
	133	}
	134	early_param("mminit_loglevel", set_mminit_loglevel);