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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 <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;
      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(EXIT_FAILURE);
}

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(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)
{
      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 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);
}

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;
      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
                        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;
}

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