slub: add slabinfo tool
Christoph Lameter [Sun, 6 May 2007 21:49:48 +0000 (14:49 -0700)]
Add the tool which gets reports about slabs to the VM documentation directory.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/vm/slabinfo.c [new file with mode: 0644]

diff --git a/Documentation/vm/slabinfo.c b/Documentation/vm/slabinfo.c
new file mode 100644 (file)
index 0000000..41710cc
--- /dev/null
@@ -0,0 +1,943 @@
+/*
+ * 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>
+
+#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 aliases = 0;
+int alias_targets = 0;
+int highest_node = 0;
+
+char buffer[4096];
+
+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 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 [-ahnpvtsz] [slab-regexp]\n"
+               "-a|--aliases           Show aliases\n"
+               "-h|--help              Show usage information\n"
+               "-n|--numa              Show NUMA information\n"
+               "-s|--shrink            Shrink slabs\n"
+               "-v|--validate          Validate slabs\n"
+               "-t|--tracking          Show alloc/free information\n"
+               "-T|--Totals            Show summary information\n"
+               "-l|--slabs             Show slabs\n"
+               "-S|--Size              Sort by size\n"
+               "-z|--zero              Include empty slabs\n"
+               "-f|--first-alias       Show first alias\n"
+               "-i|--inverted          Inverted list\n"
+               "-1|--1ref              Single reference\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];
+
+       sprintf(x, "%s/%s", s->name, name);
+
+       FILE *f = fopen(x, "w");
+
+       if (!f)
+               fatal("Cannot write to %s\n", x);
+
+       fprintf(f, "%d\n", n);
+       fclose(f);
+}
+
+/*
+ * 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;
+                       }
+       }
+       if (best)
+               return best;
+       fatal("Cannot find alias for %s\n", find->name);
+       return NULL;
+}
+
+unsigned long slab_size(struct slabinfo *s)
+{
+       return  s->slabs * (page_size << s->order);
+}
+
+
+void slabcache(struct slabinfo *s)
+{
+       char size_str[20];
+       char dist_str[40];
+       char flags[20];
+       char *p = flags;
+
+       if (skip_zero && !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);
+}
+
+void slab_numa(struct slabinfo *s)
+{
+       int node;
+
+       if (!highest_node)
+               fatal("No NUMA information available.\n");
+
+       if (skip_zero && !s->slabs)
+               return;
+
+       if (!line) {
+               printf("\nSlab             Node ");
+               for(node = 0; node <= highest_node; node++)
+                       printf(" %4d", node);
+               printf("\n----------------------");
+               for(node = 0; node <= highest_node; node++)
+                       printf("-----");
+               printf("\n");
+       }
+       printf("%-21s ", s->name);
+       for(node = 0; node <= highest_node; node++) {
+               char b[20];
+
+               store_size(b, s->numa[node]);
+               printf(" %4s", b);
+       }
+       printf("\n");
+       line++;
+}
+
+void show_tracking(struct slabinfo *s)
+{
+       printf("\n%s: Calls to allocate a slab object\n", s->name);
+       printf("---------------------------------------------------\n");
+       if (read_obj("alloc_calls"))
+               printf(buffer);
+
+       printf("%s: Calls to free a slab object\n", s->name);
+       printf("-----------------------------------------------\n");
+       if (read_obj("free_calls"))
+               printf(buffer);
+
+}
+
+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%-20s <- %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);
+
+               s->name = a->name;
+       }
+}
+
+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;
+
+       dir = opendir(".");
+       while ((de = readdir(dir))) {
+               if (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;
+       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);
+               else
+               if (show_track)
+                       show_tracking(slab);
+               else
+               if (validate)
+                       slab_validate(slab);
+               else
+               if (shrink)
+                       slab_shrink(slab);
+               else {
+                       if (show_slab)
+                               slabcache(slab);
+               }
+       }
+}
+
+struct option opts[] = {
+       { "aliases", 0, NULL, 'a' },
+       { "slabs", 0, NULL, 'l' },
+       { "numa", 0, NULL, 'n' },
+       { "zero", 0, NULL, 'z' },
+       { "help", 0, NULL, 'h' },
+       { "validate", 0, NULL, 'v' },
+       { "first-alias", 0, NULL, 'f' },
+       { "shrink", 0, NULL, 's' },
+       { "track", 0, NULL, 't'},
+       { "inverted", 0, NULL, 'i'},
+       { "1ref", 0, NULL, '1'},
+       { NULL, 0, NULL, 0 }
+};
+
+int main(int argc, char *argv[])
+{
+       int c;
+       int err;
+       char *pattern_source;
+
+       page_size = getpagesize();
+       if (chdir("/sys/slab"))
+               fatal("This kernel does not have SLUB support.\n");
+
+       while ((c = getopt_long(argc, argv, "afhil1npstvzTS", opts, NULL)) != -1)
+       switch(c) {
+               case '1':
+                       show_single_ref = 1;
+                       break;
+               case 'a':
+                       show_alias = 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 '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
+               && !validate && !shrink)
+                       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;
+}