// SPDX-License-Identifier: GPL-2.0
/*
* Slabinfo: Tool to get reports about slabs
*
* (C) 2007 sgi, Christoph Lameter
* (C) 2011 Linux Foundation, Christoph Lameter
*
* Compile with:
*
* 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;
unsigned int hwcache_align, object_size, objs_per_slab;
unsigned int sanity_checks, slab_size, store_user, trace;
int order, poison, reclaim_account, red_zone;
unsigned long partial, objects, slabs, objects_partial, objects_total;
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, order_fallback;
unsigned long cmpxchg_double_cpu_fail, cmpxchg_double_fail;
unsigned long alloc_node_mismatch, deactivate_bypass;
unsigned long cpu_partial_alloc, cpu_partial_free;
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;
int actual_slabs;
int aliases;
int alias_targets;
int highest_node;
char buffer[4096];
int show_empty;
int show_report;
int show_alias;
int show_slab;
int skip_zero = 1;
int show_numa;
int show_track;
int show_first_alias;
int validate;
int shrink;
int show_inverted;
int show_single_ref;
int show_totals;
int sort_size;
int sort_active;
int set_debug;
int show_ops;
int sort_partial;
int show_activity;
int output_lines = -1;
int sort_loss;
int extended_totals;
int show_bytes;
int unreclaim_only;
/* Debug options */
int sanity;
int redzone;
int poison;
int tracking;
int tracing;
int page_size;
regex_t pattern;
static void fatal(const char *x, ...)
{
va_list ap;
va_start(ap, x);
vfprintf(stderr, x, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
static void usage(void)
{
printf("slabinfo 4/15/2011. (c) 2007 sgi/(c) 2011 Linux Foundation.\n\n"
"slabinfo [-aABDefhilLnoPrsStTUvXz1] [N=K] [-dafzput] [slab-regexp]\n"
"-a|--aliases Show aliases\n"
"-A|--activity Most active slabs first\n"
"-B|--Bytes Show size in bytes\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"
"-L|--Loss Sort by loss\n"
"-n|--numa Show NUMA information\n"
"-N|--lines=K Show the first K slabs\n"
"-o|--ops Show kmem_cache_ops\n"
"-P|--partial Sort by number of partial slabs\n"
"-r|--report Detailed report on single slabs\n"
"-s|--shrink Shrink slabs\n"
"-S|--Size Sort by size\n"
"-t|--tracking Show alloc/free information\n"
"-T|--Totals Show summary information\n"
"-U|--Unreclaim Show unreclaimable slabs only\n"
"-v|--validate Validate slabs\n"
"-X|--Xtotals Show extended summary information\n"
"-z|--zero Include empty slabs\n"
"-1|--1ref Single reference\n"
"\n"
"-d | --debug Switch off all debug options\n"
"-da | --debug=a Switch on all debug options (--debug=FZPU)\n"
"\n"
"-d[afzput] | --debug=[afzput]\n"
" f | F Sanity Checks (SLAB_CONSISTENCY_CHECKS)\n"
" z | Z Redzoning\n"
" p | P Poisoning\n"
" u | U Tracking\n"
" t | T Tracing\n"
"\nSorting options (--Loss, --Size, --Partial) are mutually exclusive\n"
);
}
static unsigned long read_obj(const char *name)
{
FILE *f = fopen(name, "r");
if (!f) {
buffer[0] = 0;
if (errno == EACCES)
fatal("%s, Try using superuser\n", strerror(errno));
} 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
*/
static unsigned long get_obj(const char *name)
{
if (!read_obj(name))
return 0;
return atol(buffer);
}
static 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;
}
static 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);
}
static 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;
}
static unsigned long read_debug_slab_obj(struct slabinfo *s, const char *name)
{
char x[128];
FILE *f;
size_t l;
snprintf(x, 128, "/sys/kernel/debug/slab/%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
*/
static int store_size(char *buffer, unsigned long value)
{
unsigned long divisor = 1;
char trailer = 0;
int n;
if (!show_bytes) {
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;
}
static 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++;
}
}
static void slab_validate(struct slabinfo *s)
{
if (strcmp(s->name, "*") == 0)
return;
set_obj(s, "validate", 1);
}
static void slab_shrink(struct slabinfo *s)
{
if (strcmp(s->name, "*") == 0)
return;
set_obj(s, "shrink", 1);
}
int line = 0;
static void first_line(void)
{
if (show_activity)
printf("Name Objects Alloc Free"
" %%Fast Fallb O CmpX UL\n");
else
printf("Name Objects Objsize %s "
"Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n",
sort_loss ? " Loss" : "Space");
}
/*
* Find the shortest alias of a slab
*/
static 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;
}
static unsigned long slab_size(struct slabinfo *s)
{
return s->slabs * (page_size << s->order);
}
static unsigned long slab_activity(struct slabinfo *s)
{
return s->alloc_fastpath + s->free_fastpath +
s->alloc_slowpath + s->free_slowpath;
}
static unsigned long slab_waste(struct slabinfo *s)
{
return slab_size(s) - s->objects * s->object_size;
}
static 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++;
}
static void show_tracking(struct slabinfo *s)
{
printf("\n%s: Kernel object allocation\n", s->name);
printf("-----------------------------------------------------------------------\n");
if (read_debug_slab_obj(s, "alloc_traces"))
printf("%s", buffer);
else if (read_slab_obj(s, "alloc_calls"))
printf("%s", buffer);
else
printf("No Data\n");
printf("\n%s: Kernel object freeing\n", s->name);
printf("------------------------------------------------------------------------\n");
if (read_debug_slab_obj(s, "free_traces"))
printf("%s", buffer);
else if (read_slab_obj(s, "free_calls"))
printf("%s", buffer);
else
printf("No Data\n");
}
static 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("%s", buffer);
} else
printf("\n%s has no kmem_cache operations\n", s->name);
}
static const char *onoff(int x)
{
if (x)
return "On ";
return "Off";
}
static 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,
total_free ? s->free_fastpath * 100 / total_free : 0);
printf("Slowpath %8lu %8lu %3lu %3lu\n",
total_alloc - s->alloc_fastpath, s->free_slowpath,
(total_alloc - s->alloc_fastpath) * 100 / total_alloc,
total_free ? s->free_slowpath * 100 / total_free : 0);
printf("Page Alloc %8lu %8lu %3lu %3lu\n",
s->alloc_slab, s->free_slab,
s->alloc_slab * 100 / total_alloc,
total_free ? s->free_slab * 100 / total_free : 0);
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,
total_free ? s->free_add_partial * 100 / total_free : 0);
printf("Remove partial %8lu %8lu %3lu %3lu\n",
s->alloc_from_partial, s->free_remove_partial,
s->alloc_from_partial * 100 / total_alloc,
total_free ? s->free_remove_partial * 100 / total_free : 0);
printf("Cpu partial list %8lu %8lu %3lu %3lu\n",
s->cpu_partial_alloc, s->cpu_partial_free,
s->cpu_partial_alloc * 100 / total_alloc,
total_free ? s->cpu_partial_free * 100 / total_free : 0);
printf("RemoteObj/SlabFrozen %8lu %8lu %3lu %3lu\n",
s->deactivate_remote_frees, s->free_frozen,
s->deactivate_remote_frees * 100 / total_alloc,
total_free ? s->free_frozen * 100 / total_free : 0);
printf("Total %8lu %8lu\n\n", total_alloc, total_free);
if (s->cpuslab_flush)
printf("Flushes %8lu\n", s->cpuslab_flush);
total = s->deactivate_full + s->deactivate_empty +
s->deactivate_to_head + s->deactivate_to_tail + s->deactivate_bypass;
if (total) {
printf("\nSlab Deactivation Occurrences %%\n");
printf("-------------------------------------------------\n");
printf("Slab full %7lu %3lu%%\n",
s->deactivate_full, (s->deactivate_full * 100) / total);
printf("Slab empty %7lu %3lu%%\n",
s->deactivate_empty, (s->deactivate_empty * 100) / total);
printf("Moved to head of partial list %7lu %3lu%%\n",
s->deactivate_to_head, (s->deactivate_to_head * 100) / total);
printf("Moved to tail of partial list %7lu %3lu%%\n",
s->deactivate_to_tail, (s->deactivate_to_tail * 100) / total);
printf("Deactivation bypass %7lu %3lu%%\n",
s->deactivate_bypass, (s->deactivate_bypass * 100) / total);
printf("Refilled from foreign frees %7lu %3lu%%\n",
s->alloc_refill, (s->alloc_refill * 100) / total);
printf("Node mismatch %7lu %3lu%%\n",
s->alloc_node_mismatch, (s->alloc_node_mismatch * 100) / total);
}
if (s->cmpxchg_double_fail || s->cmpxchg_double_cpu_fail) {
printf("\nCmpxchg_double Looping\n------------------------\n");
printf("Locked Cmpxchg Double redos %lu\nUnlocked Cmpxchg Double redos %lu\n",
s->cmpxchg_double_fail, s->cmpxchg_double_cpu_fail);
}
}
static void report(struct slabinfo *s)
{
if (strcmp(s->name, "*") == 0)
return;
printf("\nSlabcache: %-15s 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);
}
static 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 (unreclaim_only && s->reclaim_account)
return;
if (actual_slabs == 1) {
report(s);
return;
}
if (skip_zero && !show_empty && !s->slabs)
return;
if (show_empty && s->slabs)
return;
if (sort_loss == 0)
store_size(size_str, slab_size(s));
else
store_size(size_str, slab_waste(s));
snprintf(dist_str, 40, "%lu/%lu/%d", s->slabs - s->cpu_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 %10ld %10ld %3ld %3ld %5ld %1d %4ld %4ld\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,
s->order_fallback, s->order, s->cmpxchg_double_fail,
s->cmpxchg_double_cpu_fail);
} else {
printf("%-21s %8ld %7d %15s %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.
*/
static 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;
}
static 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;
}
static void slab_debug(struct slabinfo *s)
{
if (strcmp(s->name, "*") == 0)
return;
if (sanity && !s->sanity_checks) {
set_obj(s, "sanity_checks", 1);
}
if (!sanity && s->sanity_checks) {
if (slab_empty(s))
set_obj(s, "sanity_checks", 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);
}
static 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;
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;
percentage_partial_slabs = s->partial * 100 / s->slabs;
if (percentage_partial_slabs > 100)
percentage_partial_slabs = 100;
percentage_partial_objs = s->objects_partial * 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 (s->objects_partial < min_partobj)
min_partobj = s->objects_partial;
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 (s->objects_partial > max_partobj)
max_partobj = s->objects_partial;
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 += s->objects_partial;
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 : %15d Aliases : %11d->%-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: %15s # Loss : %15s 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 : %15s # PartObj: %15s 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 %15s %15s %15s %15s\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 %15s %15s %15s %15s\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 %15s %15s %15s %15s\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%15s%% %15s%% %15s%% %15s%%\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 %15s %15s %15s %15s\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%15s%% %15s%% %15s%% %15s%%\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 %15s %15s %15s %15s\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 %15s %15s %15s %15s\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 %15s %15s %15s %15s\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 %15s %15s %15s\n",
b1, b2, b3);
store_size(b1, avg_objsize);store_size(b2, min_objsize);
store_size(b3, max_objsize);
printf("User %15s %15s %15s\n",
b1, b2, b3);
store_size(b1, avg_objwaste);store_size(b2, min_objwaste);
store_size(b3, max_objwaste);
printf("Loss %15s %15s %15s\n",
b1, b2, b3);
}
static 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) {
if (slab_size(s1) == slab_size(s2))
result = strcasecmp(s1->name, s2->name);
else
result = slab_size(s1) < slab_size(s2);
} else if (sort_active) {
if (slab_activity(s1) == slab_activity(s2))
result = strcasecmp(s1->name, s2->name);
else
result = slab_activity(s1) < slab_activity(s2);
} else if (sort_loss) {
if (slab_waste(s1) == slab_waste(s2))
result = strcasecmp(s1->name, s2->name);
else
result = slab_waste(s1) < slab_waste(s2);
} else if (sort_partial) {
if (s1->partial == s2->partial)
result = strcasecmp(s1->name, s2->name);
else
result = s1->partial < s2->partial;
} 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));
}
}
}
}
static 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));
}
}
}
}
static 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);
}
}
static 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("%-15s -> %s\n", a->name, a->slab->name);
}
if (active)
printf("\n");
}
static 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--;
}
}
}
static int slab_mismatch(char *slab)
{
return regexec(&pattern, slab, 0, NULL, 0);
}
static 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)-1);
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->objects_partial = get_obj("objects_partial");
slab->objects_total = get_obj("objects_total");
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");
slab->order_fallback = get_obj("order_fallback");
slab->cmpxchg_double_cpu_fail = get_obj("cmpxchg_double_cpu_fail");
slab->cmpxchg_double_fail = get_obj("cmpxchg_double_fail");
slab->cpu_partial_alloc = get_obj("cpu_partial_alloc");
slab->cpu_partial_free = get_obj("cpu_partial_free");
slab->alloc_node_mismatch = get_obj("alloc_node_mismatch");
slab->deactivate_bypass = get_obj("deactivate_bypass");
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");
}
static void output_slabs(void)
{
struct slabinfo *slab;
int lines = output_lines;
for (slab = slabinfo; (slab < slabinfo + slabs) &&
lines != 0; slab++) {
if (slab->alias)
continue;
if (lines != -1)
lines--;
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);
}
}
static void _xtotals(char *heading, char *underline,
int loss, int size, int partial)
{
printf("%s%s", heading, underline);
line = 0;
sort_loss = loss;
sort_size = size;
sort_partial = partial;
sort_slabs();
output_slabs();
}
static void xtotals(void)
{
char *heading, *underline;
totals();
link_slabs();
rename_slabs();
heading = "\nSlabs sorted by size\n";
underline = "--------------------\n";
_xtotals(heading, underline, 0, 1, 0);
heading = "\nSlabs sorted by loss\n";
underline = "--------------------\n";
_xtotals(heading, underline, 1, 0, 0);
heading = "\nSlabs sorted by number of partial slabs\n";
underline = "---------------------------------------\n";
_xtotals(heading, underline, 0, 0, 1);
printf("\n");
}
struct option opts[] = {
{ "aliases", no_argument, NULL, 'a' },
{ "activity", no_argument, NULL, 'A' },
{ "Bytes", no_argument, NULL, 'B'},
{ "debug", optional_argument, NULL, 'd' },
{ "display-activity", no_argument, NULL, 'D' },
{ "empty", no_argument, NULL, 'e' },
{ "first-alias", no_argument, NULL, 'f' },
{ "help", no_argument, NULL, 'h' },
{ "inverted", no_argument, NULL, 'i'},
{ "slabs", no_argument, NULL, 'l' },
{ "Loss", no_argument, NULL, 'L'},
{ "numa", no_argument, NULL, 'n' },
{ "lines", required_argument, NULL, 'N'},
{ "ops", no_argument, NULL, 'o' },
{ "partial", no_argument, NULL, 'p'},
{ "report", no_argument, NULL, 'r' },
{ "shrink", no_argument, NULL, 's' },
{ "Size", no_argument, NULL, 'S'},
{ "tracking", no_argument, NULL, 't'},
{ "Totals", no_argument, NULL, 'T'},
{ "Unreclaim", no_argument, NULL, 'U'},
{ "validate", no_argument, NULL, 'v' },
{ "Xtotals", no_argument, NULL, 'X'},
{ "zero", no_argument, NULL, 'z' },
{ "1ref", no_argument, 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, "aABd::DefhilLnN:oPrsStTUvXz1",
opts, NULL)) != -1)
switch (c) {
case 'a':
show_alias = 1;
break;
case 'A':
sort_active = 1;
break;
case 'B':
show_bytes = 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 'l':
show_slab = 1;
break;
case 'L':
sort_loss = 1;
break;
case 'n':
show_numa = 1;
break;
case 'N':
if (optarg) {
output_lines = atoi(optarg);
if (output_lines < 1)
output_lines = 1;
}
break;
case 'o':
show_ops = 1;
break;
case 'r':
show_report = 1;
break;
case 'P':
sort_partial = 1;
break;
case 's':
shrink = 1;
break;
case 'S':
sort_size = 1;
break;
case 't':
show_track = 1;
break;
case 'T':
show_totals = 1;
break;
case 'U':
unreclaim_only = 1;
break;
case 'v':
validate = 1;
break;
case 'X':
if (output_lines == -1)
output_lines = 1;
extended_totals = 1;
show_bytes = 1;
break;
case 'z':
skip_zero = 0;
break;
case '1':
show_single_ref = 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 (extended_totals) {
xtotals();
} else if (show_totals) {
totals();
} else {
link_slabs();
rename_slabs();
sort_slabs();
output_slabs();
}
return 0;
}