Documentation/vm/slabinfo.c

/*
 * Slabinfo: Tool to get reports about slabs
 *
 * (C) 2007 sgi, Christoph Lameter <clameter@sgi.com>
 *
 * Compile by:
 *
 * gcc -o slabinfo slabinfo.c
 */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <dirent.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include <getopt.h>
#include <regex.h>
#include <errno.h>

#define MAX_SLABS 500
#define MAX_ALIASES 500
#define MAX_NODES 1024

struct slabinfo {
	char *name;
	int alias;
	int refs;
	int aliases, align, cache_dma, cpu_slabs, destroy_by_rcu;
	int hwcache_align, object_size, objs_per_slab;
	int sanity_checks, slab_size, store_user, trace;
	int order, poison, reclaim_account, red_zone;
	unsigned long partial, objects, slabs;
	int numa[MAX_NODES];
	int numa_partial[MAX_NODES];
} slabinfo[MAX_SLABS];

struct aliasinfo {
	char *name;
	char *ref;
	struct slabinfo *slab;
} aliasinfo[MAX_ALIASES];

int slabs = 0;
int actual_slabs = 0;
int aliases = 0;
int alias_targets = 0;
int highest_node = 0;

char buffer[4096];

int show_empty = 0;
int show_report = 0;
int show_alias = 0;
int show_slab = 0;
int skip_zero = 1;
int show_numa = 0;
int show_track = 0;
int show_first_alias = 0;
int validate = 0;
int shrink = 0;
int show_inverted = 0;
int show_single_ref = 0;
int show_totals = 0;
int sort_size = 0;
int set_debug = 0;
int show_ops = 0;

/* Debug options */
int sanity = 0;
int redzone = 0;
int poison = 0;
int tracking = 0;
int tracing = 0;

int page_size;

regex_t pattern;

void fatal(const char *x, ...)
{
	va_list ap;

	va_start(ap, x);
	vfprintf(stderr, x, ap);
	va_end(ap);
	exit(1);
}

void usage(void)
{
	printf("slabinfo 5/7/2007. (c) 2007 sgi. clameter@sgi.com\n\n"
		"slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
		"-a|--aliases           Show aliases\n"
		"-d<options>|--debug=<options> Set/Clear Debug options\n"
		"-e|--empty		Show empty slabs\n"
		"-f|--first-alias       Show first alias\n"
		"-h|--help              Show usage information\n"
		"-i|--inverted          Inverted list\n"
		"-l|--slabs             Show slabs\n"
		"-n|--numa              Show NUMA information\n"
		"-o|--ops		Show kmem_cache_ops\n"
		"-s|--shrink            Shrink slabs\n"
		"-r|--report		Detailed report on single slabs\n"
		"-S|--Size              Sort by size\n"
		"-t|--tracking          Show alloc/free information\n"
		"-T|--Totals            Show summary information\n"
		"-v|--validate          Validate slabs\n"
		"-z|--zero              Include empty slabs\n"
		"-1|--1ref              Single reference\n"
		"\nValid debug options (FZPUT may be combined)\n"
		"a / A          Switch on all debug options (=FZUP)\n"
		"-              Switch off all debug options\n"
		"f / F          Sanity Checks (SLAB_DEBUG_FREE)\n"
		"z / Z          Redzoning\n"
		"p / P          Poisoning\n"
		"u / U          Tracking\n"
		"t / T          Tracing\n"
	);
}

unsigned long read_obj(char *name)
{
	FILE *f = fopen(name, "r");

	if (!f)
		buffer[0] = 0;
	else {
		if (!fgets(buffer,sizeof(buffer), f))
			buffer[0] = 0;
		fclose(f);
		if (buffer[strlen(buffer)] == '\n')
			buffer[strlen(buffer)] = 0;
	}
	return strlen(buffer);
}


/*
 * Get the contents of an attribute
 */
unsigned long get_obj(char *name)
{
	if (!read_obj(name))
		return 0;

	return atol(buffer);
}

unsigned long get_obj_and_str(char *name, char **x)
{
	unsigned long result = 0;
	char *p;

	*x = NULL;

	if (!read_obj(name)) {
		x = NULL;
		return 0;
	}
	result = strtoul(buffer, &p, 10);
	while (*p == ' ')
		p++;
	if (*p)
		*x = strdup(p);
	return result;
}

void set_obj(struct slabinfo *s, char *name, int n)
{
	char x[100];
	FILE *f;

	sprintf(x, "%s/%s", s->name, name);
	f = fopen(x, "w");
	if (!f)
		fatal("Cannot write to %s\n", x);

	fprintf(f, "%d\n", n);
	fclose(f);
}

unsigned long read_slab_obj(struct slabinfo *s, char *name)
{
	char x[100];
	FILE *f;
	int l;

	sprintf(x, "%s/%s", s->name, name);
	f = fopen(x, "r");
	if (!f) {
		buffer[0] = 0;
		l = 0;
	} else {
		l = fread(buffer, 1, sizeof(buffer), f);
		buffer[l] = 0;
		fclose(f);
	}
	return l;
}


/*
 * Put a size string together
 */
int store_size(char *buffer, unsigned long value)
{
	unsigned long divisor = 1;
	char trailer = 0;
	int n;

	if (value > 1000000000UL) {
		divisor = 100000000UL;
		trailer = 'G';
	} else if (value > 1000000UL) {
		divisor = 100000UL;
		trailer = 'M';
	} else if (value > 1000UL) {
		divisor = 100;
		trailer = 'K';
	}

	value /= divisor;
	n = sprintf(buffer, "%ld",value);
	if (trailer) {
		buffer[n] = trailer;
		n++;
		buffer[n] = 0;
	}
	if (divisor != 1) {
		memmove(buffer + n - 2, buffer + n - 3, 4);
		buffer[n-2] = '.';
		n++;
	}
	return n;
}

void decode_numa_list(int *numa, char *t)
{
	int node;
	int nr;

	memset(numa, 0, MAX_NODES * sizeof(int));

	while (*t == 'N') {
		t++;
		node = strtoul(t, &t, 10);
		if (*t == '=') {
			t++;
			nr = strtoul(t, &t, 10);
			numa[node] = nr;
			if (node > highest_node)
				highest_node = node;
		}
		while (*t == ' ')
			t++;
	}
}

void slab_validate(struct slabinfo *s)
{
	set_obj(s, "validate", 1);
}

void slab_shrink(struct slabinfo *s)
{
	set_obj(s, "shrink", 1);
}

int line = 0;

void first_line(void)
{
	printf("Name                   Objects Objsize    Space "
		"Slabs/Part/Cpu  O/S O %%Fr %%Ef Flg\n");
}

/*
 * Find the shortest alias of a slab
 */
struct aliasinfo *find_one_alias(struct slabinfo *find)
{
	struct aliasinfo *a;
	struct aliasinfo *best = NULL;

	for(a = aliasinfo;a < aliasinfo + aliases; a++) {
		if (a->slab == find &&
			(!best || strlen(best->name) < strlen(a->name))) {
				best = a;
				if (strncmp(a->name,"kmall", 5) == 0)
					return best;
			}
	}
	return best;
}

unsigned long slab_size(struct slabinfo *s)
{
	return 	s->slabs * (page_size << s->order);
}

void slab_numa(struct slabinfo *s, int mode)
{
	int node;

	if (strcmp(s->name, "*") == 0)
		return;

	if (!highest_node) {
		printf("\n%s: No NUMA information available.\n", s->name);
		return;
	}

	if (skip_zero && !s->slabs)
		return;

	if (!line) {
		printf("\n%-21s:", mode ? "NUMA nodes" : "Slab");
		for(node = 0; node <= highest_node; node++)
			printf(" %4d", node);
		printf("\n----------------------");
		for(node = 0; node <= highest_node; node++)
			printf("-----");
		printf("\n");
	}
	printf("%-21s ", mode ? "All slabs" : s->name);
	for(node = 0; node <= highest_node; node++) {
		char b[20];

		store_size(b, s->numa[node]);
		printf(" %4s", b);
	}
	printf("\n");
	if (mode) {
		printf("%-21s ", "Partial slabs");
		for(node = 0; node <= highest_node; node++) {
			char b[20];

			store_size(b, s->numa_partial[node]);
			printf(" %4s", b);
		}
		printf("\n");
	}
	line++;
}

void show_tracking(struct slabinfo *s)
{
	printf("\n%s: Kernel object allocation\n", s->name);
	printf("-----------------------------------------------------------------------\n");
	if (read_slab_obj(s, "alloc_calls"))
		printf(buffer);
	else
		printf("No Data\n");

	printf("\n%s: Kernel object freeing\n", s->name);
	printf("------------------------------------------------------------------------\n");
	if (read_slab_obj(s, "free_calls"))
		printf(buffer);
	else
		printf("No Data\n");

}

void ops(struct slabinfo *s)
{
	if (strcmp(s->name, "*") == 0)
		return;

	if (read_slab_obj(s, "ops")) {
		printf("\n%s: kmem_cache operations\n", s->name);
		printf("--------------------------------------------\n");
		printf(buffer);
	} else
		printf("\n%s has no kmem_cache operations\n", s->name);
}

const char *onoff(int x)
{
	if (x)
		return "On ";
	return "Off";
}

void report(struct slabinfo *s)
{
	if (strcmp(s->name, "*") == 0)
		return;
	printf("\nSlabcache: %-20s  Aliases: %2d Order : %2d\n", s->name, s->aliases, s->order);
	if (s->hwcache_align)
		printf("** Hardware cacheline aligned\n");
	if (s->cache_dma)
		printf("** Memory is allocated in a special DMA zone\n");
	if (s->destroy_by_rcu)
		printf("** Slabs are destroyed via RCU\n");
	if (s->reclaim_account)
		printf("** Reclaim accounting active\n");

	printf("\nSizes (bytes)     Slabs              Debug                Memory\n");
	printf("------------------------------------------------------------------------\n");
	printf("Object : %7d  Total  : %7ld   Sanity Checks : %s  Total: %7ld\n",
			s->object_size, s->slabs, onoff(s->sanity_checks),
			s->slabs * (page_size << s->order));
	printf("SlabObj: %7d  Full   : %7ld   Redzoning     : %s  Used : %7ld\n",
			s->slab_size, s->slabs - s->partial - s->cpu_slabs,
			onoff(s->red_zone), s->objects * s->object_size);
	printf("SlabSiz: %7d  Partial: %7ld   Poisoning     : %s  Loss : %7ld\n",
			page_size << s->order, s->partial, onoff(s->poison),
			s->slabs * (page_size << s->order) - s->objects * s->object_size);
	printf("Loss   : %7d  CpuSlab: %7d   Tracking      : %s  Lalig: %7ld\n",
			s->slab_size - s->object_size, s->cpu_slabs, onoff(s->store_user),
			(s->slab_size - s->object_size) * s->objects);
	printf("Align  : %7d  Objects: %7d   Tracing       : %s  Lpadd: %7ld\n",
			s->align, s->objs_per_slab, onoff(s->trace),
			((page_size << s->order) - s->objs_per_slab * s->slab_size) *
			s->slabs);

	ops(s);
	show_tracking(s);
	slab_numa(s, 1);
}

void slabcache(struct slabinfo *s)
{
	char size_str[20];
	char dist_str[40];
	char flags[20];
	char *p = flags;

	if (strcmp(s->name, "*") == 0)
		return;

	if (actual_slabs == 1) {
		report(s);
		return;
	}

	if (skip_zero && !show_empty && !s->slabs)
		return;

	if (show_empty && s->slabs)
		return;

	store_size(size_str, slab_size(s));
	sprintf(dist_str,"%lu/%lu/%d", s->slabs, s->partial, s->cpu_slabs);

	if (!line++)
		first_line();

	if (s->aliases)
		*p++ = '*';
	if (s->cache_dma)
		*p++ = 'd';
	if (s->hwcache_align)
		*p++ = 'A';
	if (s->poison)
		*p++ = 'P';
	if (s->reclaim_account)
		*p++ = 'a';
	if (s->red_zone)
		*p++ = 'Z';
	if (s->sanity_checks)
		*p++ = 'F';
	if (s->store_user)
		*p++ = 'U';
	if (s->trace)
		*p++ = 'T';

	*p = 0;
	printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
		s->name, s->objects, s->object_size, size_str, dist_str,
		s->objs_per_slab, s->order,
		s->slabs ? (s->partial * 100) / s->slabs : 100,
		s->slabs ? (s->objects * s->object_size * 100) /
			(s->slabs * (page_size << s->order)) : 100,
		flags);
}

/*
 * Analyze debug options. Return false if something is amiss.
 */
int debug_opt_scan(char *opt)
{
	if (!opt || !opt[0] || strcmp(opt, "-") == 0)
		return 1;

	if (strcasecmp(opt, "a") == 0) {
		sanity = 1;
		poison = 1;
		redzone = 1;
		tracking = 1;
		return 1;
	}

	for ( ; *opt; opt++)
	 	switch (*opt) {
		case 'F' : case 'f':
			if (sanity)
				return 0;
			sanity = 1;
			break;
		case 'P' : case 'p':
			if (poison)
				return 0;
			poison = 1;
			break;

		case 'Z' : case 'z':
			if (redzone)
				return 0;
			redzone = 1;
			break;

		case 'U' : case 'u':
			if (tracking)
				return 0;
			tracking = 1;
			break;

		case 'T' : case 't':
			if (tracing)
				return 0;
			tracing = 1;
			break;
		default:
			return 0;
		}
	return 1;
}

int slab_empty(struct slabinfo *s)
{
	if (s->objects > 0)
		return 0;

	/*
	 * We may still have slabs even if there are no objects. Shrinking will
	 * remove them.
	 */
	if (s->slabs != 0)
		set_obj(s, "shrink", 1);

	return 1;
}

void slab_debug(struct slabinfo *s)
{
	if (sanity && !s->sanity_checks) {
		set_obj(s, "sanity", 1);
	}
	if (!sanity && s->sanity_checks) {
		if (slab_empty(s))
			set_obj(s, "sanity", 0);
		else
			fprintf(stderr, "%s not empty cannot disable sanity checks\n", s->name);
	}
	if (redzone && !s->red_zone) {
		if (slab_empty(s))
			set_obj(s, "red_zone", 1);
		else
			fprintf(stderr, "%s not empty cannot enable redzoning\n", s->name);
	}
	if (!redzone && s->red_zone) {
		if (slab_empty(s))
			set_obj(s, "red_zone", 0);
		else
			fprintf(stderr, "%s not empty cannot disable redzoning\n", s->name);
	}
	if (poison && !s->poison) {
		if (slab_empty(s))
			set_obj(s, "poison", 1);
		else
			fprintf(stderr, "%s not empty cannot enable poisoning\n", s->name);
	}
	if (!poison && s->poison) {
		if (slab_empty(s))
			set_obj(s, "poison", 0);
		else
			fprintf(stderr, "%s not empty cannot disable poisoning\n", s->name);
	}
	if (tracking && !s->store_user) {
		if (slab_empty(s))
			set_obj(s, "store_user", 1);
		else
			fprintf(stderr, "%s not empty cannot enable tracking\n", s->name);
	}
	if (!tracking && s->store_user) {
		if (slab_empty(s))
			set_obj(s, "store_user", 0);
		else
			fprintf(stderr, "%s not empty cannot disable tracking\n", s->name);
	}
	if (tracing && !s->trace) {
		if (slabs == 1)
			set_obj(s, "trace", 1);
		else
			fprintf(stderr, "%s can only enable trace for one slab at a time\n", s->name);
	}
	if (!tracing && s->trace)
		set_obj(s, "trace", 1);
}

void totals(void)
{
	struct slabinfo *s;

	int used_slabs = 0;
	char b1[20], b2[20], b3[20], b4[20];
	unsigned long long max = 1ULL << 63;

	/* Object size */
	unsigned long long min_objsize = max, max_objsize = 0, avg_objsize;

	/* Number of partial slabs in a slabcache */
	unsigned long long min_partial = max, max_partial = 0,
				avg_partial, total_partial = 0;

	/* Number of slabs in a slab cache */
	unsigned long long min_slabs = max, max_slabs = 0,
				avg_slabs, total_slabs = 0;

	/* Size of the whole slab */
	unsigned long long min_size = max, max_size = 0,
				avg_size, total_size = 0;

	/* Bytes used for object storage in a slab */
	unsigned long long min_used = max, max_used = 0,
				avg_used, total_used = 0;

	/* Waste: Bytes used for alignment and padding */
	unsigned long long min_waste = max, max_waste = 0,
				avg_waste, total_waste = 0;
	/* Number of objects in a slab */
	unsigned long long min_objects = max, max_objects = 0,
				avg_objects, total_objects = 0;
	/* Waste per object */
	unsigned long long min_objwaste = max,
				max_objwaste = 0, avg_objwaste,
				total_objwaste = 0;

	/* Memory per object */
	unsigned long long min_memobj = max,
				max_memobj = 0, avg_memobj,
				total_objsize = 0;

	/* Percentage of partial slabs per slab */
	unsigned long min_ppart = 100, max_ppart = 0,
				avg_ppart, total_ppart = 0;

	/* Number of objects in partial slabs */
	unsigned long min_partobj = max, max_partobj = 0,
				avg_partobj, total_partobj = 0;

	/* Percentage of partial objects of all objects in a slab */
	unsigned long min_ppartobj = 100, max_ppartobj = 0,
				avg_ppartobj, total_ppartobj = 0;


	for (s = slabinfo; s < slabinfo + slabs; s++) {
		unsigned long long size;
		unsigned long used;
		unsigned long long wasted;
		unsigned long long objwaste;
		long long objects_in_partial_slabs;
		unsigned long percentage_partial_slabs;
		unsigned long percentage_partial_objs;

		if (!s->slabs || !s->objects)
			continue;

		used_slabs++;

		size = slab_size(s);
		used = s->objects * s->object_size;
		wasted = size - used;
		objwaste = s->slab_size - s->object_size;

		objects_in_partial_slabs = s->objects -
			(s->slabs - s->partial - s ->cpu_slabs) *
			s->objs_per_slab;

		if (objects_in_partial_slabs < 0)
			objects_in_partial_slabs = 0;

		percentage_partial_slabs = s->partial * 100 / s->slabs;
		if (percentage_partial_slabs > 100)
			percentage_partial_slabs = 100;

		percentage_partial_objs = objects_in_partial_slabs * 100
							/ s->objects;

		if (percentage_partial_objs > 100)
			percentage_partial_objs = 100;

		if (s->object_size < min_objsize)
			min_objsize = s->object_size;
		if (s->partial < min_partial)
			min_partial = s->partial;
		if (s->slabs < min_slabs)
			min_slabs = s->slabs;
		if (size < min_size)
			min_size = size;
		if (wasted < min_waste)
			min_waste = wasted;
		if (objwaste < min_objwaste)
			min_objwaste = objwaste;
		if (s->objects < min_objects)
			min_objects = s->objects;
		if (used < min_used)
			min_used = used;
		if (objects_in_partial_slabs < min_partobj)
			min_partobj = objects_in_partial_slabs;
		if (percentage_partial_slabs < min_ppart)
			min_ppart = percentage_partial_slabs;
		if (percentage_partial_objs < min_ppartobj)
			min_ppartobj = percentage_partial_objs;
		if (s->slab_size < min_memobj)
			min_memobj = s->slab_size;

		if (s->object_size > max_objsize)
			max_objsize = s->object_size;
		if (s->partial > max_partial)
			max_partial = s->partial;
		if (s->slabs > max_slabs)
			max_slabs = s->slabs;
		if (size > max_size)
			max_size = size;
		if (wasted > max_waste)
			max_waste = wasted;
		if (objwaste > max_objwaste)
			max_objwaste = objwaste;
		if (s->objects > max_objects)
			max_objects = s->objects;
		if (used > max_used)
			max_used = used;
		if (objects_in_partial_slabs > max_partobj)
			max_partobj = objects_in_partial_slabs;
		if (percentage_partial_slabs > max_ppart)
			max_ppart = percentage_partial_slabs;
		if (percentage_partial_objs > max_ppartobj)
			max_ppartobj = percentage_partial_objs;
		if (s->slab_size > max_memobj)
			max_memobj = s->slab_size;

		total_partial += s->partial;
		total_slabs += s->slabs;
		total_size += size;
		total_waste += wasted;

		total_objects += s->objects;
		total_used += used;
		total_partobj += objects_in_partial_slabs;
		total_ppart += percentage_partial_slabs;
		total_ppartobj += percentage_partial_objs;

		total_objwaste += s->objects * objwaste;
		total_objsize += s->objects * s->slab_size;
	}

	if (!total_objects) {
		printf("No objects\n");
		return;
	}
	if (!used_slabs) {
		printf("No slabs\n");
		return;
	}

	/* Per slab averages */
	avg_partial = total_partial / used_slabs;
	avg_slabs = total_slabs / used_slabs;
	avg_size = total_size / used_slabs;
	avg_waste = total_waste / used_slabs;

	avg_objects = total_objects / used_slabs;
	avg_used = total_used / used_slabs;
	avg_partobj = total_partobj / used_slabs;
	avg_ppart = total_ppart / used_slabs;
	avg_ppartobj = total_ppartobj / used_slabs;

	/* Per object object sizes */
	avg_objsize = total_used / total_objects;
	avg_objwaste = total_objwaste / total_objects;
	avg_partobj = total_partobj * 100 / total_objects;
	avg_memobj = total_objsize / total_objects;

	printf("Slabcache Totals\n");
	printf("----------------\n");
	printf("Slabcaches : %3d      Aliases  : %3d->%-3d Active: %3d\n",
			slabs, aliases, alias_targets, used_slabs);

	store_size(b1, total_size);store_size(b2, total_waste);
	store_size(b3, total_waste * 100 / total_used);
	printf("Memory used: %6s   # Loss   : %6s   MRatio: %6s%%\n", b1, b2, b3);

	store_size(b1, total_objects);store_size(b2, total_partobj);
	store_size(b3, total_partobj * 100 / total_objects);
	printf("# Objects  : %6s   # PartObj: %6s   ORatio: %6s%%\n", b1, b2, b3);

	printf("\n");
	printf("Per Cache    Average         Min         Max       Total\n");
	printf("---------------------------------------------------------\n");

	store_size(b1, avg_objects);store_size(b2, min_objects);
	store_size(b3, max_objects);store_size(b4, total_objects);
	printf("#Objects  %10s  %10s  %10s  %10s\n",
			b1,	b2,	b3,	b4);

	store_size(b1, avg_slabs);store_size(b2, min_slabs);
	store_size(b3, max_slabs);store_size(b4, total_slabs);
	printf("#Slabs    %10s  %10s  %10s  %10s\n",
			b1,	b2,	b3,	b4);

	store_size(b1, avg_partial);store_size(b2, min_partial);
	store_size(b3, max_partial);store_size(b4, total_partial);
	printf("#PartSlab %10s  %10s  %10s  %10s\n",
			b1,	b2,	b3,	b4);
	store_size(b1, avg_ppart);store_size(b2, min_ppart);
	store_size(b3, max_ppart);
	store_size(b4, total_partial * 100  / total_slabs);
	printf("%%PartSlab %10s%% %10s%% %10s%% %10s%%\n",
			b1,	b2,	b3,	b4);

	store_size(b1, avg_partobj);store_size(b2, min_partobj);
	store_size(b3, max_partobj);
	store_size(b4, total_partobj);
	printf("PartObjs  %10s  %10s  %10s  %10s\n",
			b1,	b2,	b3,	b4);

	store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj);
	store_size(b3, max_ppartobj);
	store_size(b4, total_partobj * 100 / total_objects);
	printf("%% PartObj %10s%% %10s%% %10s%% %10s%%\n",
			b1,	b2,	b3,	b4);

	store_size(b1, avg_size);store_size(b2, min_size);
	store_size(b3, max_size);store_size(b4, total_size);
	printf("Memory    %10s  %10s  %10s  %10s\n",
			b1,	b2,	b3,	b4);

	store_size(b1, avg_used);store_size(b2, min_used);
	store_size(b3, max_used);store_size(b4, total_used);
	printf("Used      %10s  %10s  %10s  %10s\n",
			b1,	b2,	b3,	b4);

	store_size(b1, avg_waste);store_size(b2, min_waste);
	store_size(b3, max_waste);store_size(b4, total_waste);
	printf("Loss      %10s  %10s  %10s  %10s\n",
			b1,	b2,	b3,	b4);

	printf("\n");
	printf("Per Object   Average         Min         Max\n");
	printf("---------------------------------------------\n");

	store_size(b1, avg_memobj);store_size(b2, min_memobj);
	store_size(b3, max_memobj);
	printf("Memory    %10s  %10s  %10s\n",
			b1,	b2,	b3);
	store_size(b1, avg_objsize);store_size(b2, min_objsize);
	store_size(b3, max_objsize);
	printf("User      %10s  %10s  %10s\n",
			b1,	b2,	b3);

	store_size(b1, avg_objwaste);store_size(b2, min_objwaste);
	store_size(b3, max_objwaste);
	printf("Loss      %10s  %10s  %10s\n",
			b1,	b2,	b3);
}

void sort_slabs(void)
{
	struct slabinfo *s1,*s2;

	for (s1 = slabinfo; s1 < slabinfo + slabs; s1++) {
		for (s2 = s1 + 1; s2 < slabinfo + slabs; s2++) {
			int result;

			if (sort_size)
				result = slab_size(s1) < slab_size(s2);
			else
				result = strcasecmp(s1->name, s2->name);

			if (show_inverted)
				result = -result;

			if (result > 0) {
				struct slabinfo t;

				memcpy(&t, s1, sizeof(struct slabinfo));
				memcpy(s1, s2, sizeof(struct slabinfo));
				memcpy(s2, &t, sizeof(struct slabinfo));
			}
		}
	}
}

void sort_aliases(void)
{
	struct aliasinfo *a1,*a2;

	for (a1 = aliasinfo; a1 < aliasinfo + aliases; a1++) {
		for (a2 = a1 + 1; a2 < aliasinfo + aliases; a2++) {
			char *n1, *n2;

			n1 = a1->name;
			n2 = a2->name;
			if (show_alias && !show_inverted) {
				n1 = a1->ref;
				n2 = a2->ref;
			}
			if (strcasecmp(n1, n2) > 0) {
				struct aliasinfo t;

				memcpy(&t, a1, sizeof(struct aliasinfo));
				memcpy(a1, a2, sizeof(struct aliasinfo));
				memcpy(a2, &t, sizeof(struct aliasinfo));
			}
		}
	}
}

void link_slabs(void)
{
	struct aliasinfo *a;
	struct slabinfo *s;

	for (a = aliasinfo; a < aliasinfo + aliases; a++) {

		for (s = slabinfo; s < slabinfo + slabs; s++)
			if (strcmp(a->ref, s->name) == 0) {
				a->slab = s;
				s->refs++;
				break;
			}
		if (s == slabinfo + slabs)
			fatal("Unresolved alias %s\n", a->ref);
	}
}

void alias(void)
{
	struct aliasinfo *a;
	char *active = NULL;

	sort_aliases();
	link_slabs();

	for(a = aliasinfo; a < aliasinfo + aliases; a++) {

		if (!show_single_ref && a->slab->refs == 1)
			continue;

		if (!show_inverted) {
			if (active) {
				if (strcmp(a->slab->name, active) == 0) {
					printf(" %s", a->name);
					continue;
				}
			}
			printf("\n%-12s <- %s", a->slab->name, a->name);
			active = a->slab->name;
		}
		else
			printf("%-20s -> %s\n", a->name, a->slab->name);
	}
	if (active)
		printf("\n");
}


void rename_slabs(void)
{
	struct slabinfo *s;
	struct aliasinfo *a;

	for (s = slabinfo; s < slabinfo + slabs; s++) {
		if (*s->name != ':')
			continue;

		if (s->refs > 1 && !show_first_alias)
			continue;

		a = find_one_alias(s);

		if (a)
			s->name = a->name;
		else {
			s->name = "*";
			actual_slabs--;
		}
	}
}

int slab_mismatch(char *slab)
{
	return regexec(&pattern, slab, 0, NULL, 0);
}

void read_slab_dir(void)
{
	DIR *dir;
	struct dirent *de;
	struct slabinfo *slab = slabinfo;
	struct aliasinfo *alias = aliasinfo;
	char *p;
	char *t;
	int count;

	if (chdir("/sys/slab"))
		fatal("SYSFS support for SLUB not active\n");

	dir = opendir(".");
	while ((de = readdir(dir))) {
		if (de->d_name[0] == '.' ||
			(de->d_name[0] != ':' && slab_mismatch(de->d_name)))
				continue;
		switch (de->d_type) {
		   case DT_LNK:
		   	alias->name = strdup(de->d_name);
			count = readlink(de->d_name, buffer, sizeof(buffer));

			if (count < 0)
				fatal("Cannot read symlink %s\n", de->d_name);

			buffer[count] = 0;
			p = buffer + count;
			while (p > buffer && p[-1] != '/')
				p--;
			alias->ref = strdup(p);
			alias++;
			break;
		   case DT_DIR:
			if (chdir(de->d_name))
				fatal("Unable to access slab %s\n", slab->name);
		   	slab->name = strdup(de->d_name);
			slab->alias = 0;
			slab->refs = 0;
			slab->aliases = get_obj("aliases");
			slab->align = get_obj("align");
			slab->cache_dma = get_obj("cache_dma");
			slab->cpu_slabs = get_obj("cpu_slabs");
			slab->destroy_by_rcu = get_obj("destroy_by_rcu");
			slab->hwcache_align = get_obj("hwcache_align");
			slab->object_size = get_obj("object_size");
			slab->objects = get_obj("objects");
			slab->objs_per_slab = get_obj("objs_per_slab");
			slab->order = get_obj("order");
			slab->partial = get_obj("partial");
			slab->partial = get_obj_and_str("partial", &t);
			decode_numa_list(slab->numa_partial, t);
			slab->poison = get_obj("poison");
			slab->reclaim_account = get_obj("reclaim_account");
			slab->red_zone = get_obj("red_zone");
			slab->sanity_checks = get_obj("sanity_checks");
			slab->slab_size = get_obj("slab_size");
			slab->slabs = get_obj_and_str("slabs", &t);
			decode_numa_list(slab->numa, t);
			slab->store_user = get_obj("store_user");
			slab->trace = get_obj("trace");
			chdir("..");
			if (slab->name[0] == ':')
				alias_targets++;
			slab++;
			break;
		   default :
			fatal("Unknown file type %lx\n", de->d_type);
		}
	}
	closedir(dir);
	slabs = slab - slabinfo;
	actual_slabs = slabs;
	aliases = alias - aliasinfo;
	if (slabs > MAX_SLABS)
		fatal("Too many slabs\n");
	if (aliases > MAX_ALIASES)
		fatal("Too many aliases\n");
}

void output_slabs(void)
{
	struct slabinfo *slab;

	for (slab = slabinfo; slab < slabinfo + slabs; slab++) {

		if (slab->alias)
			continue;


		if (show_numa)
			slab_numa(slab, 0);
		else if (show_track)
			show_tracking(slab);
		else if (validate)
			slab_validate(slab);
		else if (shrink)
			slab_shrink(slab);
		else if (set_debug)
			slab_debug(slab);
		else if (show_ops)
			ops(slab);
		else if (show_slab)
			slabcache(slab);
	}
}

struct option opts[] = {
	{ "aliases", 0, NULL, 'a' },
	{ "debug", 2, NULL, 'd' },
	{ "empty", 0, NULL, 'e' },
	{ "first-alias", 0, NULL, 'f' },
	{ "help", 0, NULL, 'h' },
	{ "inverted", 0, NULL, 'i'},
	{ "numa", 0, NULL, 'n' },
	{ "ops", 0, NULL, 'o' },
	{ "report", 0, NULL, 'r' },
	{ "shrink", 0, NULL, 's' },
	{ "slabs", 0, NULL, 'l' },
	{ "track", 0, NULL, 't'},
	{ "validate", 0, NULL, 'v' },
	{ "zero", 0, NULL, 'z' },
	{ "1ref", 0, NULL, '1'},
	{ NULL, 0, NULL, 0 }
};

int main(int argc, char *argv[])
{
	int c;
	int err;
	char *pattern_source;

	page_size = getpagesize();

	while ((c = getopt_long(argc, argv, "ad::efhil1noprstvzTS",
						opts, NULL)) != -1)
	switch(c) {
		case '1':
			show_single_ref = 1;
			break;
		case 'a':
			show_alias = 1;
			break;
		case 'd':
			set_debug = 1;
			if (!debug_opt_scan(optarg))
				fatal("Invalid debug option '%s'\n", optarg);
			break;
		case 'e':
			show_empty = 1;
			break;
		case 'f':
			show_first_alias = 1;
			break;
		case 'h':
			usage();
			return 0;
		case 'i':
			show_inverted = 1;
			break;
		case 'n':
			show_numa = 1;
			break;
		case 'o':
			show_ops = 1;
			break;
		case 'r':
			show_report = 1;
			break;
		case 's':
			shrink = 1;
			break;
		case 'l':
			show_slab = 1;
			break;
		case 't':
			show_track = 1;
			break;
		case 'v':
			validate = 1;
			break;
		case 'z':
			skip_zero = 0;
			break;
		case 'T':
			show_totals = 1;
			break;
		case 'S':
			sort_size = 1;
			break;

		default:
			fatal("%s: Invalid option '%c'\n", argv[0], optopt);

	}

	if (!show_slab && !show_alias && !show_track && !show_report
		&& !validate && !shrink && !set_debug && !show_ops)
			show_slab = 1;

	if (argc > optind)
		pattern_source = argv[optind];
	else
		pattern_source = ".*";

	err = regcomp(&pattern, pattern_source, REG_ICASE|REG_NOSUB);
	if (err)
		fatal("%s: Invalid pattern '%s' code %d\n",
			argv[0], pattern_source, err);
	read_slab_dir();
	if (show_alias)
		alias();
	else
	if (show_totals)
		totals();
	else {
		link_slabs();
		rename_slabs();
		sort_slabs();
		output_slabs();
	}
	return 0;
}