Documentation / vm / slabinfo.c

Based on kernel version 2.6.26. Page generated on 2008-07-16 21:13 EST.

	/*
	 * Slabinfo: Tool to get reports about slabs
	 *
	 * (C) 2007 sgi, Christoph Lameter <clameter[AT]sgi[DOT]com>
	 *
	 * Compile by:
	 *
	 * gcc -o slabinfo slabinfo.c
	 */
	#include <stdio.h>
	#include <stdlib.h>
	#include <sys/types.h>
	#include <dirent.h>
	#include <strings.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;
		unsigned long alloc_fastpath, alloc_slowpath;
		unsigned long free_fastpath, free_slowpath;
		unsigned long free_frozen, free_add_partial, free_remove_partial;
		unsigned long alloc_from_partial, alloc_slab, free_slab, alloc_refill;
		unsigned long cpuslab_flush, deactivate_full, deactivate_empty;
		unsigned long deactivate_to_head, deactivate_to_tail;
		unsigned long deactivate_remote_frees;
		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 sort_active = 0;
	int set_debug = 0;
	int show_ops = 0;
	int show_activity = 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(EXIT_FAILURE);
	}
	
	void usage(void)
	{
		printf("slabinfo 5/7/2007. (c) 2007 sgi. clameter[AT]sgi[DOT]com\n\n"
			"slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
			"-a|--aliases           Show aliases\n"
			"-A|--activity          Most active slabs first\n"
			"-d<options>|--debug=<options> Set/Clear Debug options\n"
			"-D|--display-active    Switch line format to activity\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(const 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(const char *name)
	{
		if (!read_obj(name))
			return 0;
	
		return atol(buffer);
	}
	
	unsigned long get_obj_and_str(const 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, const char *name, int n)
	{
		char x[100];
		FILE *f;
	
		snprintf(x, 100, "%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, const char *name)
	{
		char x[100];
		FILE *f;
		size_t l;
	
		snprintf(x, 100, "%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));
	
		if (!t)
			return;
	
		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)
	{
		if (strcmp(s->name, "*") == 0)
			return;
	
		set_obj(s, "validate", 1);
	}
	
	void slab_shrink(struct slabinfo *s)
	{
		if (strcmp(s->name, "*") == 0)
			return;
	
		set_obj(s, "shrink", 1);
	}
	
	int line = 0;
	
	void first_line(void)
	{
		if (show_activity)
			printf("Name                   Objects    Alloc     Free   %%Fast\n");
		else
			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);
	}
	
	unsigned long slab_activity(struct slabinfo *s)
	{
		return 	s->alloc_fastpath + s->free_fastpath +
			s->alloc_slowpath + s->free_slowpath;
	}
	
	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 slab_stats(struct slabinfo *s)
	{
		unsigned long total_alloc;
		unsigned long total_free;
		unsigned long total;
	
		if (!s->alloc_slab)
			return;
	
		total_alloc = s->alloc_fastpath + s->alloc_slowpath;
		total_free = s->free_fastpath + s->free_slowpath;
	
		if (!total_alloc)
			return;
	
		printf("\n");
		printf("Slab Perf Counter       Alloc     Free %%Al %%Fr\n");
		printf("--------------------------------------------------\n");
		printf("Fastpath             %8lu %8lu %3lu %3lu\n",
			s->alloc_fastpath, s->free_fastpath,
			s->alloc_fastpath * 100 / total_alloc,
			s->free_fastpath * 100 / total_free);
		printf("Slowpath             %8lu %8lu %3lu %3lu\n",
			total_alloc - s->alloc_fastpath, s->free_slowpath,
			(total_alloc - s->alloc_fastpath) * 100 / total_alloc,
			s->free_slowpath * 100 / total_free);
		printf("Page Alloc           %8lu %8lu %3lu %3lu\n",
			s->alloc_slab, s->free_slab,
			s->alloc_slab * 100 / total_alloc,
			s->free_slab * 100 / total_free);
		printf("Add partial          %8lu %8lu %3lu %3lu\n",
			s->deactivate_to_head + s->deactivate_to_tail,
			s->free_add_partial,
			(s->deactivate_to_head + s->deactivate_to_tail) * 100 / total_alloc,
			s->free_add_partial * 100 / total_free);
		printf("Remove partial       %8lu %8lu %3lu %3lu\n",
			s->alloc_from_partial, s->free_remove_partial,
			s->alloc_from_partial * 100 / total_alloc,
			s->free_remove_partial * 100 / total_free);
	
		printf("RemoteObj/SlabFrozen %8lu %8lu %3lu %3lu\n",
			s->deactivate_remote_frees, s->free_frozen,
			s->deactivate_remote_frees * 100 / total_alloc,
			s->free_frozen * 100 / total_free);
	
		printf("Total                %8lu %8lu\n\n", total_alloc, total_free);
	
		if (s->cpuslab_flush)
			printf("Flushes %8lu\n", s->cpuslab_flush);
	
		if (s->alloc_refill)
			printf("Refill %8lu\n", s->alloc_refill);
	
		total = s->deactivate_full + s->deactivate_empty +
				s->deactivate_to_head + s->deactivate_to_tail;
	
		if (total)
			printf("Deactivate Full=%lu(%lu%%) Empty=%lu(%lu%%) "
				"ToHead=%lu(%lu%%) ToTail=%lu(%lu%%)\n",
				s->deactivate_full, (s->deactivate_full * 100) / total,
				s->deactivate_empty, (s->deactivate_empty * 100) / total,
				s->deactivate_to_head, (s->deactivate_to_head * 100) / total,
				s->deactivate_to_tail, (s->deactivate_to_tail * 100) / total);
	}
	
	void report(struct slabinfo *s)
	{
		if (strcmp(s->name, "*") == 0)
			return;
	
		printf("\nSlabcache: %-20s  Aliases: %2d Order : %2d Objects: %lu\n",
			s->name, s->aliases, s->order, s->objects);
		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);
		slab_stats(s);
	}
	
	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));
		snprintf(dist_str, 40, "%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;
		if (show_activity) {
			unsigned long total_alloc;
			unsigned long total_free;
	
			total_alloc = s->alloc_fastpath + s->alloc_slowpath;
			total_free = s->free_fastpath + s->free_slowpath;
	
			printf("%-21s %8ld %8ld %8ld %3ld %3ld \n",
				s->name, s->objects,
				total_alloc, total_free,
				total_alloc ? (s->alloc_fastpath * 100 / total_alloc) : 0,
				total_free ? (s->free_fastpath * 100 / total_free) : 0);
		}
		else
			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 (strcmp(s->name, "*") == 0)
			return;
	
		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 if (sort_active)
					result = slab_activity(s1) < slab_activity(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/kernel/slab") && 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");
				slab->alloc_fastpath = get_obj("alloc_fastpath");
				slab->alloc_slowpath = get_obj("alloc_slowpath");
				slab->free_fastpath = get_obj("free_fastpath");
				slab->free_slowpath = get_obj("free_slowpath");
				slab->free_frozen= get_obj("free_frozen");
				slab->free_add_partial = get_obj("free_add_partial");
				slab->free_remove_partial = get_obj("free_remove_partial");
				slab->alloc_from_partial = get_obj("alloc_from_partial");
				slab->alloc_slab = get_obj("alloc_slab");
				slab->alloc_refill = get_obj("alloc_refill");
				slab->free_slab = get_obj("free_slab");
				slab->cpuslab_flush = get_obj("cpuslab_flush");
				slab->deactivate_full = get_obj("deactivate_full");
				slab->deactivate_empty = get_obj("deactivate_empty");
				slab->deactivate_to_head = get_obj("deactivate_to_head");
				slab->deactivate_to_tail = get_obj("deactivate_to_tail");
				slab->deactivate_remote_frees = get_obj("deactivate_remote_frees");
				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' },
		{ "activity", 0, NULL, 'A' },
		{ "debug", 2, NULL, 'd' },
		{ "display-activity", 0, 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, "aAd::Defhil1noprstvzTS",
							opts, NULL)) != -1)
			switch (c) {
			case '1':
				show_single_ref = 1;
				break;
			case 'a':
				show_alias = 1;
				break;
			case 'A':
				sort_active = 1;
				break;
			case 'd':
				set_debug = 1;
				if (!debug_opt_scan(optarg))
					fatal("Invalid debug option '%s'\n", optarg);
				break;
			case 'D':
				show_activity = 1;
				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;
	}

• [ vm ]
• 00-INDEX
• balance
• hugetlbpage.txt
• locking
• numa
• numa_memory_policy.txt
• overcommit-accounting
• page_migration
• slabinfo.c
• slub.txt
•