slabinfo.c

linux 内核源代码

	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);
			free(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);
			free(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);
		else if (show_report)
			report(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;
}