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1/*
2 * Slabinfo: Tool to get reports about slabs
3 *
4 * (C) 2007 sgi, Christoph Lameter
5 * (C) 2011 Linux Foundation, Christoph Lameter
6 *
7 * Compile with:
8 *
9 * gcc -o slabinfo slabinfo.c
10 */
11#include <stdio.h>
12#include <stdlib.h>
13#include <sys/types.h>
14#include <dirent.h>
15#include <strings.h>
16#include <string.h>
17#include <unistd.h>
18#include <stdarg.h>
19#include <getopt.h>
20#include <regex.h>
21#include <errno.h>
22
23#define MAX_SLABS 500
24#define MAX_ALIASES 500
25#define MAX_NODES 1024
26
27struct slabinfo {
28 char *name;
29 int alias;
30 int refs;
31 int aliases, align, cache_dma, cpu_slabs, destroy_by_rcu;
32 int hwcache_align, object_size, objs_per_slab;
33 int sanity_checks, slab_size, store_user, trace;
34 int order, poison, reclaim_account, red_zone;
35 unsigned long partial, objects, slabs, objects_partial, objects_total;
36 unsigned long alloc_fastpath, alloc_slowpath;
37 unsigned long free_fastpath, free_slowpath;
38 unsigned long free_frozen, free_add_partial, free_remove_partial;
39 unsigned long alloc_from_partial, alloc_slab, free_slab, alloc_refill;
40 unsigned long cpuslab_flush, deactivate_full, deactivate_empty;
41 unsigned long deactivate_to_head, deactivate_to_tail;
42 unsigned long deactivate_remote_frees, order_fallback;
43 unsigned long cmpxchg_double_cpu_fail, cmpxchg_double_fail;
44 unsigned long alloc_node_mismatch, deactivate_bypass;
45 unsigned long cpu_partial_alloc, cpu_partial_free;
46 int numa[MAX_NODES];
47 int numa_partial[MAX_NODES];
48} slabinfo[MAX_SLABS];
49
50struct aliasinfo {
51 char *name;
52 char *ref;
53 struct slabinfo *slab;
54} aliasinfo[MAX_ALIASES];
55
56int slabs;
57int actual_slabs;
58int aliases;
59int alias_targets;
60int highest_node;
61
62char buffer[4096];
63
64int show_empty;
65int show_report;
66int show_alias;
67int show_slab;
68int skip_zero = 1;
69int show_numa;
70int show_track;
71int show_first_alias;
72int validate;
73int shrink;
74int show_inverted;
75int show_single_ref;
76int show_totals;
77int sort_size;
78int sort_active;
79int set_debug;
80int show_ops;
81int show_activity;
82int output_lines = -1;
83int sort_loss;
84int extended_totals;
85int show_bytes;
86
87/* Debug options */
88int sanity;
89int redzone;
90int poison;
91int tracking;
92int tracing;
93
94int page_size;
95
96regex_t pattern;
97
98static void fatal(const char *x, ...)
99{
100 va_list ap;
101
102 va_start(ap, x);
103 vfprintf(stderr, x, ap);
104 va_end(ap);
105 exit(EXIT_FAILURE);
106}
107
108static void usage(void)
109{
110 printf("slabinfo 4/15/2011. (c) 2007 sgi/(c) 2011 Linux Foundation.\n\n"
111 "slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
112 "-a|--aliases Show aliases\n"
113 "-A|--activity Most active slabs first\n"
114 "-d<options>|--debug=<options> Set/Clear Debug options\n"
115 "-D|--display-active Switch line format to activity\n"
116 "-e|--empty Show empty slabs\n"
117 "-f|--first-alias Show first alias\n"
118 "-h|--help Show usage information\n"
119 "-i|--inverted Inverted list\n"
120 "-l|--slabs Show slabs\n"
121 "-n|--numa Show NUMA information\n"
122 "-o|--ops Show kmem_cache_ops\n"
123 "-s|--shrink Shrink slabs\n"
124 "-r|--report Detailed report on single slabs\n"
125 "-S|--Size Sort by size\n"
126 "-t|--tracking Show alloc/free information\n"
127 "-T|--Totals Show summary information\n"
128 "-v|--validate Validate slabs\n"
129 "-z|--zero Include empty slabs\n"
130 "-1|--1ref Single reference\n"
131 "-N|--lines=K Show the first K slabs\n"
132 "-L|--Loss Sort by loss\n"
133 "-X|--Xtotals Show extended summary information\n"
134 "-B|--Bytes Show size in bytes\n"
135 "\nValid debug options (FZPUT may be combined)\n"
136 "a / A Switch on all debug options (=FZUP)\n"
137 "- Switch off all debug options\n"
138 "f / F Sanity Checks (SLAB_CONSISTENCY_CHECKS)\n"
139 "z / Z Redzoning\n"
140 "p / P Poisoning\n"
141 "u / U Tracking\n"
142 "t / T Tracing\n"
143 );
144}
145
146static unsigned long read_obj(const char *name)
147{
148 FILE *f = fopen(name, "r");
149
150 if (!f)
151 buffer[0] = 0;
152 else {
153 if (!fgets(buffer, sizeof(buffer), f))
154 buffer[0] = 0;
155 fclose(f);
156 if (buffer[strlen(buffer)] == '\n')
157 buffer[strlen(buffer)] = 0;
158 }
159 return strlen(buffer);
160}
161
162
163/*
164 * Get the contents of an attribute
165 */
166static unsigned long get_obj(const char *name)
167{
168 if (!read_obj(name))
169 return 0;
170
171 return atol(buffer);
172}
173
174static unsigned long get_obj_and_str(const char *name, char **x)
175{
176 unsigned long result = 0;
177 char *p;
178
179 *x = NULL;
180
181 if (!read_obj(name)) {
182 x = NULL;
183 return 0;
184 }
185 result = strtoul(buffer, &p, 10);
186 while (*p == ' ')
187 p++;
188 if (*p)
189 *x = strdup(p);
190 return result;
191}
192
193static void set_obj(struct slabinfo *s, const char *name, int n)
194{
195 char x[100];
196 FILE *f;
197
198 snprintf(x, 100, "%s/%s", s->name, name);
199 f = fopen(x, "w");
200 if (!f)
201 fatal("Cannot write to %s\n", x);
202
203 fprintf(f, "%d\n", n);
204 fclose(f);
205}
206
207static unsigned long read_slab_obj(struct slabinfo *s, const char *name)
208{
209 char x[100];
210 FILE *f;
211 size_t l;
212
213 snprintf(x, 100, "%s/%s", s->name, name);
214 f = fopen(x, "r");
215 if (!f) {
216 buffer[0] = 0;
217 l = 0;
218 } else {
219 l = fread(buffer, 1, sizeof(buffer), f);
220 buffer[l] = 0;
221 fclose(f);
222 }
223 return l;
224}
225
226
227/*
228 * Put a size string together
229 */
230static int store_size(char *buffer, unsigned long value)
231{
232 unsigned long divisor = 1;
233 char trailer = 0;
234 int n;
235
236 if (!show_bytes) {
237 if (value > 1000000000UL) {
238 divisor = 100000000UL;
239 trailer = 'G';
240 } else if (value > 1000000UL) {
241 divisor = 100000UL;
242 trailer = 'M';
243 } else if (value > 1000UL) {
244 divisor = 100;
245 trailer = 'K';
246 }
247 }
248
249 value /= divisor;
250 n = sprintf(buffer, "%ld",value);
251 if (trailer) {
252 buffer[n] = trailer;
253 n++;
254 buffer[n] = 0;
255 }
256 if (divisor != 1) {
257 memmove(buffer + n - 2, buffer + n - 3, 4);
258 buffer[n-2] = '.';
259 n++;
260 }
261 return n;
262}
263
264static void decode_numa_list(int *numa, char *t)
265{
266 int node;
267 int nr;
268
269 memset(numa, 0, MAX_NODES * sizeof(int));
270
271 if (!t)
272 return;
273
274 while (*t == 'N') {
275 t++;
276 node = strtoul(t, &t, 10);
277 if (*t == '=') {
278 t++;
279 nr = strtoul(t, &t, 10);
280 numa[node] = nr;
281 if (node > highest_node)
282 highest_node = node;
283 }
284 while (*t == ' ')
285 t++;
286 }
287}
288
289static void slab_validate(struct slabinfo *s)
290{
291 if (strcmp(s->name, "*") == 0)
292 return;
293
294 set_obj(s, "validate", 1);
295}
296
297static void slab_shrink(struct slabinfo *s)
298{
299 if (strcmp(s->name, "*") == 0)
300 return;
301
302 set_obj(s, "shrink", 1);
303}
304
305int line = 0;
306
307static void first_line(void)
308{
309 if (show_activity)
310 printf("Name Objects Alloc Free"
311 " %%Fast Fallb O CmpX UL\n");
312 else
313 printf("Name Objects Objsize %s "
314 "Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n",
315 sort_loss ? " Loss" : "Space");
316}
317
318/*
319 * Find the shortest alias of a slab
320 */
321static struct aliasinfo *find_one_alias(struct slabinfo *find)
322{
323 struct aliasinfo *a;
324 struct aliasinfo *best = NULL;
325
326 for(a = aliasinfo;a < aliasinfo + aliases; a++) {
327 if (a->slab == find &&
328 (!best || strlen(best->name) < strlen(a->name))) {
329 best = a;
330 if (strncmp(a->name,"kmall", 5) == 0)
331 return best;
332 }
333 }
334 return best;
335}
336
337static unsigned long slab_size(struct slabinfo *s)
338{
339 return s->slabs * (page_size << s->order);
340}
341
342static unsigned long slab_activity(struct slabinfo *s)
343{
344 return s->alloc_fastpath + s->free_fastpath +
345 s->alloc_slowpath + s->free_slowpath;
346}
347
348static unsigned long slab_waste(struct slabinfo *s)
349{
350 return slab_size(s) - s->objects * s->object_size;
351}
352
353static void slab_numa(struct slabinfo *s, int mode)
354{
355 int node;
356
357 if (strcmp(s->name, "*") == 0)
358 return;
359
360 if (!highest_node) {
361 printf("\n%s: No NUMA information available.\n", s->name);
362 return;
363 }
364
365 if (skip_zero && !s->slabs)
366 return;
367
368 if (!line) {
369 printf("\n%-21s:", mode ? "NUMA nodes" : "Slab");
370 for(node = 0; node <= highest_node; node++)
371 printf(" %4d", node);
372 printf("\n----------------------");
373 for(node = 0; node <= highest_node; node++)
374 printf("-----");
375 printf("\n");
376 }
377 printf("%-21s ", mode ? "All slabs" : s->name);
378 for(node = 0; node <= highest_node; node++) {
379 char b[20];
380
381 store_size(b, s->numa[node]);
382 printf(" %4s", b);
383 }
384 printf("\n");
385 if (mode) {
386 printf("%-21s ", "Partial slabs");
387 for(node = 0; node <= highest_node; node++) {
388 char b[20];
389
390 store_size(b, s->numa_partial[node]);
391 printf(" %4s", b);
392 }
393 printf("\n");
394 }
395 line++;
396}
397
398static void show_tracking(struct slabinfo *s)
399{
400 printf("\n%s: Kernel object allocation\n", s->name);
401 printf("-----------------------------------------------------------------------\n");
402 if (read_slab_obj(s, "alloc_calls"))
403 printf("%s", buffer);
404 else
405 printf("No Data\n");
406
407 printf("\n%s: Kernel object freeing\n", s->name);
408 printf("------------------------------------------------------------------------\n");
409 if (read_slab_obj(s, "free_calls"))
410 printf("%s", buffer);
411 else
412 printf("No Data\n");
413
414}
415
416static void ops(struct slabinfo *s)
417{
418 if (strcmp(s->name, "*") == 0)
419 return;
420
421 if (read_slab_obj(s, "ops")) {
422 printf("\n%s: kmem_cache operations\n", s->name);
423 printf("--------------------------------------------\n");
424 printf("%s", buffer);
425 } else
426 printf("\n%s has no kmem_cache operations\n", s->name);
427}
428
429static const char *onoff(int x)
430{
431 if (x)
432 return "On ";
433 return "Off";
434}
435
436static void slab_stats(struct slabinfo *s)
437{
438 unsigned long total_alloc;
439 unsigned long total_free;
440 unsigned long total;
441
442 if (!s->alloc_slab)
443 return;
444
445 total_alloc = s->alloc_fastpath + s->alloc_slowpath;
446 total_free = s->free_fastpath + s->free_slowpath;
447
448 if (!total_alloc)
449 return;
450
451 printf("\n");
452 printf("Slab Perf Counter Alloc Free %%Al %%Fr\n");
453 printf("--------------------------------------------------\n");
454 printf("Fastpath %8lu %8lu %3lu %3lu\n",
455 s->alloc_fastpath, s->free_fastpath,
456 s->alloc_fastpath * 100 / total_alloc,
457 total_free ? s->free_fastpath * 100 / total_free : 0);
458 printf("Slowpath %8lu %8lu %3lu %3lu\n",
459 total_alloc - s->alloc_fastpath, s->free_slowpath,
460 (total_alloc - s->alloc_fastpath) * 100 / total_alloc,
461 total_free ? s->free_slowpath * 100 / total_free : 0);
462 printf("Page Alloc %8lu %8lu %3lu %3lu\n",
463 s->alloc_slab, s->free_slab,
464 s->alloc_slab * 100 / total_alloc,
465 total_free ? s->free_slab * 100 / total_free : 0);
466 printf("Add partial %8lu %8lu %3lu %3lu\n",
467 s->deactivate_to_head + s->deactivate_to_tail,
468 s->free_add_partial,
469 (s->deactivate_to_head + s->deactivate_to_tail) * 100 / total_alloc,
470 total_free ? s->free_add_partial * 100 / total_free : 0);
471 printf("Remove partial %8lu %8lu %3lu %3lu\n",
472 s->alloc_from_partial, s->free_remove_partial,
473 s->alloc_from_partial * 100 / total_alloc,
474 total_free ? s->free_remove_partial * 100 / total_free : 0);
475
476 printf("Cpu partial list %8lu %8lu %3lu %3lu\n",
477 s->cpu_partial_alloc, s->cpu_partial_free,
478 s->cpu_partial_alloc * 100 / total_alloc,
479 total_free ? s->cpu_partial_free * 100 / total_free : 0);
480
481 printf("RemoteObj/SlabFrozen %8lu %8lu %3lu %3lu\n",
482 s->deactivate_remote_frees, s->free_frozen,
483 s->deactivate_remote_frees * 100 / total_alloc,
484 total_free ? s->free_frozen * 100 / total_free : 0);
485
486 printf("Total %8lu %8lu\n\n", total_alloc, total_free);
487
488 if (s->cpuslab_flush)
489 printf("Flushes %8lu\n", s->cpuslab_flush);
490
491 total = s->deactivate_full + s->deactivate_empty +
492 s->deactivate_to_head + s->deactivate_to_tail + s->deactivate_bypass;
493
494 if (total) {
495 printf("\nSlab Deactivation Ocurrences %%\n");
496 printf("-------------------------------------------------\n");
497 printf("Slab full %7lu %3lu%%\n",
498 s->deactivate_full, (s->deactivate_full * 100) / total);
499 printf("Slab empty %7lu %3lu%%\n",
500 s->deactivate_empty, (s->deactivate_empty * 100) / total);
501 printf("Moved to head of partial list %7lu %3lu%%\n",
502 s->deactivate_to_head, (s->deactivate_to_head * 100) / total);
503 printf("Moved to tail of partial list %7lu %3lu%%\n",
504 s->deactivate_to_tail, (s->deactivate_to_tail * 100) / total);
505 printf("Deactivation bypass %7lu %3lu%%\n",
506 s->deactivate_bypass, (s->deactivate_bypass * 100) / total);
507 printf("Refilled from foreign frees %7lu %3lu%%\n",
508 s->alloc_refill, (s->alloc_refill * 100) / total);
509 printf("Node mismatch %7lu %3lu%%\n",
510 s->alloc_node_mismatch, (s->alloc_node_mismatch * 100) / total);
511 }
512
513 if (s->cmpxchg_double_fail || s->cmpxchg_double_cpu_fail)
514 printf("\nCmpxchg_double Looping\n------------------------\n");
515 printf("Locked Cmpxchg Double redos %lu\nUnlocked Cmpxchg Double redos %lu\n",
516 s->cmpxchg_double_fail, s->cmpxchg_double_cpu_fail);
517}
518
519static void report(struct slabinfo *s)
520{
521 if (strcmp(s->name, "*") == 0)
522 return;
523
524 printf("\nSlabcache: %-15s Aliases: %2d Order : %2d Objects: %lu\n",
525 s->name, s->aliases, s->order, s->objects);
526 if (s->hwcache_align)
527 printf("** Hardware cacheline aligned\n");
528 if (s->cache_dma)
529 printf("** Memory is allocated in a special DMA zone\n");
530 if (s->destroy_by_rcu)
531 printf("** Slabs are destroyed via RCU\n");
532 if (s->reclaim_account)
533 printf("** Reclaim accounting active\n");
534
535 printf("\nSizes (bytes) Slabs Debug Memory\n");
536 printf("------------------------------------------------------------------------\n");
537 printf("Object : %7d Total : %7ld Sanity Checks : %s Total: %7ld\n",
538 s->object_size, s->slabs, onoff(s->sanity_checks),
539 s->slabs * (page_size << s->order));
540 printf("SlabObj: %7d Full : %7ld Redzoning : %s Used : %7ld\n",
541 s->slab_size, s->slabs - s->partial - s->cpu_slabs,
542 onoff(s->red_zone), s->objects * s->object_size);
543 printf("SlabSiz: %7d Partial: %7ld Poisoning : %s Loss : %7ld\n",
544 page_size << s->order, s->partial, onoff(s->poison),
545 s->slabs * (page_size << s->order) - s->objects * s->object_size);
546 printf("Loss : %7d CpuSlab: %7d Tracking : %s Lalig: %7ld\n",
547 s->slab_size - s->object_size, s->cpu_slabs, onoff(s->store_user),
548 (s->slab_size - s->object_size) * s->objects);
549 printf("Align : %7d Objects: %7d Tracing : %s Lpadd: %7ld\n",
550 s->align, s->objs_per_slab, onoff(s->trace),
551 ((page_size << s->order) - s->objs_per_slab * s->slab_size) *
552 s->slabs);
553
554 ops(s);
555 show_tracking(s);
556 slab_numa(s, 1);
557 slab_stats(s);
558}
559
560static void slabcache(struct slabinfo *s)
561{
562 char size_str[20];
563 char dist_str[40];
564 char flags[20];
565 char *p = flags;
566
567 if (strcmp(s->name, "*") == 0)
568 return;
569
570 if (actual_slabs == 1) {
571 report(s);
572 return;
573 }
574
575 if (skip_zero && !show_empty && !s->slabs)
576 return;
577
578 if (show_empty && s->slabs)
579 return;
580
581 if (sort_loss == 0)
582 store_size(size_str, slab_size(s));
583 else
584 store_size(size_str, slab_waste(s));
585 snprintf(dist_str, 40, "%lu/%lu/%d", s->slabs - s->cpu_slabs,
586 s->partial, s->cpu_slabs);
587
588 if (!line++)
589 first_line();
590
591 if (s->aliases)
592 *p++ = '*';
593 if (s->cache_dma)
594 *p++ = 'd';
595 if (s->hwcache_align)
596 *p++ = 'A';
597 if (s->poison)
598 *p++ = 'P';
599 if (s->reclaim_account)
600 *p++ = 'a';
601 if (s->red_zone)
602 *p++ = 'Z';
603 if (s->sanity_checks)
604 *p++ = 'F';
605 if (s->store_user)
606 *p++ = 'U';
607 if (s->trace)
608 *p++ = 'T';
609
610 *p = 0;
611 if (show_activity) {
612 unsigned long total_alloc;
613 unsigned long total_free;
614
615 total_alloc = s->alloc_fastpath + s->alloc_slowpath;
616 total_free = s->free_fastpath + s->free_slowpath;
617
618 printf("%-21s %8ld %10ld %10ld %3ld %3ld %5ld %1d %4ld %4ld\n",
619 s->name, s->objects,
620 total_alloc, total_free,
621 total_alloc ? (s->alloc_fastpath * 100 / total_alloc) : 0,
622 total_free ? (s->free_fastpath * 100 / total_free) : 0,
623 s->order_fallback, s->order, s->cmpxchg_double_fail,
624 s->cmpxchg_double_cpu_fail);
625 } else {
626 printf("%-21s %8ld %7d %15s %14s %4d %1d %3ld %3ld %s\n",
627 s->name, s->objects, s->object_size, size_str, dist_str,
628 s->objs_per_slab, s->order,
629 s->slabs ? (s->partial * 100) / s->slabs : 100,
630 s->slabs ? (s->objects * s->object_size * 100) /
631 (s->slabs * (page_size << s->order)) : 100,
632 flags);
633 }
634}
635
636/*
637 * Analyze debug options. Return false if something is amiss.
638 */
639static int debug_opt_scan(char *opt)
640{
641 if (!opt || !opt[0] || strcmp(opt, "-") == 0)
642 return 1;
643
644 if (strcasecmp(opt, "a") == 0) {
645 sanity = 1;
646 poison = 1;
647 redzone = 1;
648 tracking = 1;
649 return 1;
650 }
651
652 for ( ; *opt; opt++)
653 switch (*opt) {
654 case 'F' : case 'f':
655 if (sanity)
656 return 0;
657 sanity = 1;
658 break;
659 case 'P' : case 'p':
660 if (poison)
661 return 0;
662 poison = 1;
663 break;
664
665 case 'Z' : case 'z':
666 if (redzone)
667 return 0;
668 redzone = 1;
669 break;
670
671 case 'U' : case 'u':
672 if (tracking)
673 return 0;
674 tracking = 1;
675 break;
676
677 case 'T' : case 't':
678 if (tracing)
679 return 0;
680 tracing = 1;
681 break;
682 default:
683 return 0;
684 }
685 return 1;
686}
687
688static int slab_empty(struct slabinfo *s)
689{
690 if (s->objects > 0)
691 return 0;
692
693 /*
694 * We may still have slabs even if there are no objects. Shrinking will
695 * remove them.
696 */
697 if (s->slabs != 0)
698 set_obj(s, "shrink", 1);
699
700 return 1;
701}
702
703static void slab_debug(struct slabinfo *s)
704{
705 if (strcmp(s->name, "*") == 0)
706 return;
707
708 if (sanity && !s->sanity_checks) {
709 set_obj(s, "sanity", 1);
710 }
711 if (!sanity && s->sanity_checks) {
712 if (slab_empty(s))
713 set_obj(s, "sanity", 0);
714 else
715 fprintf(stderr, "%s not empty cannot disable sanity checks\n", s->name);
716 }
717 if (redzone && !s->red_zone) {
718 if (slab_empty(s))
719 set_obj(s, "red_zone", 1);
720 else
721 fprintf(stderr, "%s not empty cannot enable redzoning\n", s->name);
722 }
723 if (!redzone && s->red_zone) {
724 if (slab_empty(s))
725 set_obj(s, "red_zone", 0);
726 else
727 fprintf(stderr, "%s not empty cannot disable redzoning\n", s->name);
728 }
729 if (poison && !s->poison) {
730 if (slab_empty(s))
731 set_obj(s, "poison", 1);
732 else
733 fprintf(stderr, "%s not empty cannot enable poisoning\n", s->name);
734 }
735 if (!poison && s->poison) {
736 if (slab_empty(s))
737 set_obj(s, "poison", 0);
738 else
739 fprintf(stderr, "%s not empty cannot disable poisoning\n", s->name);
740 }
741 if (tracking && !s->store_user) {
742 if (slab_empty(s))
743 set_obj(s, "store_user", 1);
744 else
745 fprintf(stderr, "%s not empty cannot enable tracking\n", s->name);
746 }
747 if (!tracking && s->store_user) {
748 if (slab_empty(s))
749 set_obj(s, "store_user", 0);
750 else
751 fprintf(stderr, "%s not empty cannot disable tracking\n", s->name);
752 }
753 if (tracing && !s->trace) {
754 if (slabs == 1)
755 set_obj(s, "trace", 1);
756 else
757 fprintf(stderr, "%s can only enable trace for one slab at a time\n", s->name);
758 }
759 if (!tracing && s->trace)
760 set_obj(s, "trace", 1);
761}
762
763static void totals(void)
764{
765 struct slabinfo *s;
766
767 int used_slabs = 0;
768 char b1[20], b2[20], b3[20], b4[20];
769 unsigned long long max = 1ULL << 63;
770
771 /* Object size */
772 unsigned long long min_objsize = max, max_objsize = 0, avg_objsize;
773
774 /* Number of partial slabs in a slabcache */
775 unsigned long long min_partial = max, max_partial = 0,
776 avg_partial, total_partial = 0;
777
778 /* Number of slabs in a slab cache */
779 unsigned long long min_slabs = max, max_slabs = 0,
780 avg_slabs, total_slabs = 0;
781
782 /* Size of the whole slab */
783 unsigned long long min_size = max, max_size = 0,
784 avg_size, total_size = 0;
785
786 /* Bytes used for object storage in a slab */
787 unsigned long long min_used = max, max_used = 0,
788 avg_used, total_used = 0;
789
790 /* Waste: Bytes used for alignment and padding */
791 unsigned long long min_waste = max, max_waste = 0,
792 avg_waste, total_waste = 0;
793 /* Number of objects in a slab */
794 unsigned long long min_objects = max, max_objects = 0,
795 avg_objects, total_objects = 0;
796 /* Waste per object */
797 unsigned long long min_objwaste = max,
798 max_objwaste = 0, avg_objwaste,
799 total_objwaste = 0;
800
801 /* Memory per object */
802 unsigned long long min_memobj = max,
803 max_memobj = 0, avg_memobj,
804 total_objsize = 0;
805
806 /* Percentage of partial slabs per slab */
807 unsigned long min_ppart = 100, max_ppart = 0,
808 avg_ppart, total_ppart = 0;
809
810 /* Number of objects in partial slabs */
811 unsigned long min_partobj = max, max_partobj = 0,
812 avg_partobj, total_partobj = 0;
813
814 /* Percentage of partial objects of all objects in a slab */
815 unsigned long min_ppartobj = 100, max_ppartobj = 0,
816 avg_ppartobj, total_ppartobj = 0;
817
818
819 for (s = slabinfo; s < slabinfo + slabs; s++) {
820 unsigned long long size;
821 unsigned long used;
822 unsigned long long wasted;
823 unsigned long long objwaste;
824 unsigned long percentage_partial_slabs;
825 unsigned long percentage_partial_objs;
826
827 if (!s->slabs || !s->objects)
828 continue;
829
830 used_slabs++;
831
832 size = slab_size(s);
833 used = s->objects * s->object_size;
834 wasted = size - used;
835 objwaste = s->slab_size - s->object_size;
836
837 percentage_partial_slabs = s->partial * 100 / s->slabs;
838 if (percentage_partial_slabs > 100)
839 percentage_partial_slabs = 100;
840
841 percentage_partial_objs = s->objects_partial * 100
842 / s->objects;
843
844 if (percentage_partial_objs > 100)
845 percentage_partial_objs = 100;
846
847 if (s->object_size < min_objsize)
848 min_objsize = s->object_size;
849 if (s->partial < min_partial)
850 min_partial = s->partial;
851 if (s->slabs < min_slabs)
852 min_slabs = s->slabs;
853 if (size < min_size)
854 min_size = size;
855 if (wasted < min_waste)
856 min_waste = wasted;
857 if (objwaste < min_objwaste)
858 min_objwaste = objwaste;
859 if (s->objects < min_objects)
860 min_objects = s->objects;
861 if (used < min_used)
862 min_used = used;
863 if (s->objects_partial < min_partobj)
864 min_partobj = s->objects_partial;
865 if (percentage_partial_slabs < min_ppart)
866 min_ppart = percentage_partial_slabs;
867 if (percentage_partial_objs < min_ppartobj)
868 min_ppartobj = percentage_partial_objs;
869 if (s->slab_size < min_memobj)
870 min_memobj = s->slab_size;
871
872 if (s->object_size > max_objsize)
873 max_objsize = s->object_size;
874 if (s->partial > max_partial)
875 max_partial = s->partial;
876 if (s->slabs > max_slabs)
877 max_slabs = s->slabs;
878 if (size > max_size)
879 max_size = size;
880 if (wasted > max_waste)
881 max_waste = wasted;
882 if (objwaste > max_objwaste)
883 max_objwaste = objwaste;
884 if (s->objects > max_objects)
885 max_objects = s->objects;
886 if (used > max_used)
887 max_used = used;
888 if (s->objects_partial > max_partobj)
889 max_partobj = s->objects_partial;
890 if (percentage_partial_slabs > max_ppart)
891 max_ppart = percentage_partial_slabs;
892 if (percentage_partial_objs > max_ppartobj)
893 max_ppartobj = percentage_partial_objs;
894 if (s->slab_size > max_memobj)
895 max_memobj = s->slab_size;
896
897 total_partial += s->partial;
898 total_slabs += s->slabs;
899 total_size += size;
900 total_waste += wasted;
901
902 total_objects += s->objects;
903 total_used += used;
904 total_partobj += s->objects_partial;
905 total_ppart += percentage_partial_slabs;
906 total_ppartobj += percentage_partial_objs;
907
908 total_objwaste += s->objects * objwaste;
909 total_objsize += s->objects * s->slab_size;
910 }
911
912 if (!total_objects) {
913 printf("No objects\n");
914 return;
915 }
916 if (!used_slabs) {
917 printf("No slabs\n");
918 return;
919 }
920
921 /* Per slab averages */
922 avg_partial = total_partial / used_slabs;
923 avg_slabs = total_slabs / used_slabs;
924 avg_size = total_size / used_slabs;
925 avg_waste = total_waste / used_slabs;
926
927 avg_objects = total_objects / used_slabs;
928 avg_used = total_used / used_slabs;
929 avg_partobj = total_partobj / used_slabs;
930 avg_ppart = total_ppart / used_slabs;
931 avg_ppartobj = total_ppartobj / used_slabs;
932
933 /* Per object object sizes */
934 avg_objsize = total_used / total_objects;
935 avg_objwaste = total_objwaste / total_objects;
936 avg_partobj = total_partobj * 100 / total_objects;
937 avg_memobj = total_objsize / total_objects;
938
939 printf("Slabcache Totals\n");
940 printf("----------------\n");
941 printf("Slabcaches : %15d Aliases : %11d->%-3d Active: %3d\n",
942 slabs, aliases, alias_targets, used_slabs);
943
944 store_size(b1, total_size);store_size(b2, total_waste);
945 store_size(b3, total_waste * 100 / total_used);
946 printf("Memory used: %15s # Loss : %15s MRatio:%6s%%\n", b1, b2, b3);
947
948 store_size(b1, total_objects);store_size(b2, total_partobj);
949 store_size(b3, total_partobj * 100 / total_objects);
950 printf("# Objects : %15s # PartObj: %15s ORatio:%6s%%\n", b1, b2, b3);
951
952 printf("\n");
953 printf("Per Cache Average "
954 "Min Max Total\n");
955 printf("---------------------------------------"
956 "-------------------------------------\n");
957
958 store_size(b1, avg_objects);store_size(b2, min_objects);
959 store_size(b3, max_objects);store_size(b4, total_objects);
960 printf("#Objects %15s %15s %15s %15s\n",
961 b1, b2, b3, b4);
962
963 store_size(b1, avg_slabs);store_size(b2, min_slabs);
964 store_size(b3, max_slabs);store_size(b4, total_slabs);
965 printf("#Slabs %15s %15s %15s %15s\n",
966 b1, b2, b3, b4);
967
968 store_size(b1, avg_partial);store_size(b2, min_partial);
969 store_size(b3, max_partial);store_size(b4, total_partial);
970 printf("#PartSlab %15s %15s %15s %15s\n",
971 b1, b2, b3, b4);
972 store_size(b1, avg_ppart);store_size(b2, min_ppart);
973 store_size(b3, max_ppart);
974 store_size(b4, total_partial * 100 / total_slabs);
975 printf("%%PartSlab%15s%% %15s%% %15s%% %15s%%\n",
976 b1, b2, b3, b4);
977
978 store_size(b1, avg_partobj);store_size(b2, min_partobj);
979 store_size(b3, max_partobj);
980 store_size(b4, total_partobj);
981 printf("PartObjs %15s %15s %15s %15s\n",
982 b1, b2, b3, b4);
983
984 store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj);
985 store_size(b3, max_ppartobj);
986 store_size(b4, total_partobj * 100 / total_objects);
987 printf("%% PartObj%15s%% %15s%% %15s%% %15s%%\n",
988 b1, b2, b3, b4);
989
990 store_size(b1, avg_size);store_size(b2, min_size);
991 store_size(b3, max_size);store_size(b4, total_size);
992 printf("Memory %15s %15s %15s %15s\n",
993 b1, b2, b3, b4);
994
995 store_size(b1, avg_used);store_size(b2, min_used);
996 store_size(b3, max_used);store_size(b4, total_used);
997 printf("Used %15s %15s %15s %15s\n",
998 b1, b2, b3, b4);
999
1000 store_size(b1, avg_waste);store_size(b2, min_waste);
1001 store_size(b3, max_waste);store_size(b4, total_waste);
1002 printf("Loss %15s %15s %15s %15s\n",
1003 b1, b2, b3, b4);
1004
1005 printf("\n");
1006 printf("Per Object Average "
1007 "Min Max\n");
1008 printf("---------------------------------------"
1009 "--------------------\n");
1010
1011 store_size(b1, avg_memobj);store_size(b2, min_memobj);
1012 store_size(b3, max_memobj);
1013 printf("Memory %15s %15s %15s\n",
1014 b1, b2, b3);
1015 store_size(b1, avg_objsize);store_size(b2, min_objsize);
1016 store_size(b3, max_objsize);
1017 printf("User %15s %15s %15s\n",
1018 b1, b2, b3);
1019
1020 store_size(b1, avg_objwaste);store_size(b2, min_objwaste);
1021 store_size(b3, max_objwaste);
1022 printf("Loss %15s %15s %15s\n",
1023 b1, b2, b3);
1024}
1025
1026static void sort_slabs(void)
1027{
1028 struct slabinfo *s1,*s2;
1029
1030 for (s1 = slabinfo; s1 < slabinfo + slabs; s1++) {
1031 for (s2 = s1 + 1; s2 < slabinfo + slabs; s2++) {
1032 int result;
1033
1034 if (sort_size)
1035 result = slab_size(s1) < slab_size(s2);
1036 else if (sort_active)
1037 result = slab_activity(s1) < slab_activity(s2);
1038 else if (sort_loss)
1039 result = slab_waste(s1) < slab_waste(s2);
1040 else
1041 result = strcasecmp(s1->name, s2->name);
1042
1043 if (show_inverted)
1044 result = -result;
1045
1046 if (result > 0) {
1047 struct slabinfo t;
1048
1049 memcpy(&t, s1, sizeof(struct slabinfo));
1050 memcpy(s1, s2, sizeof(struct slabinfo));
1051 memcpy(s2, &t, sizeof(struct slabinfo));
1052 }
1053 }
1054 }
1055}
1056
1057static void sort_aliases(void)
1058{
1059 struct aliasinfo *a1,*a2;
1060
1061 for (a1 = aliasinfo; a1 < aliasinfo + aliases; a1++) {
1062 for (a2 = a1 + 1; a2 < aliasinfo + aliases; a2++) {
1063 char *n1, *n2;
1064
1065 n1 = a1->name;
1066 n2 = a2->name;
1067 if (show_alias && !show_inverted) {
1068 n1 = a1->ref;
1069 n2 = a2->ref;
1070 }
1071 if (strcasecmp(n1, n2) > 0) {
1072 struct aliasinfo t;
1073
1074 memcpy(&t, a1, sizeof(struct aliasinfo));
1075 memcpy(a1, a2, sizeof(struct aliasinfo));
1076 memcpy(a2, &t, sizeof(struct aliasinfo));
1077 }
1078 }
1079 }
1080}
1081
1082static void link_slabs(void)
1083{
1084 struct aliasinfo *a;
1085 struct slabinfo *s;
1086
1087 for (a = aliasinfo; a < aliasinfo + aliases; a++) {
1088
1089 for (s = slabinfo; s < slabinfo + slabs; s++)
1090 if (strcmp(a->ref, s->name) == 0) {
1091 a->slab = s;
1092 s->refs++;
1093 break;
1094 }
1095 if (s == slabinfo + slabs)
1096 fatal("Unresolved alias %s\n", a->ref);
1097 }
1098}
1099
1100static void alias(void)
1101{
1102 struct aliasinfo *a;
1103 char *active = NULL;
1104
1105 sort_aliases();
1106 link_slabs();
1107
1108 for(a = aliasinfo; a < aliasinfo + aliases; a++) {
1109
1110 if (!show_single_ref && a->slab->refs == 1)
1111 continue;
1112
1113 if (!show_inverted) {
1114 if (active) {
1115 if (strcmp(a->slab->name, active) == 0) {
1116 printf(" %s", a->name);
1117 continue;
1118 }
1119 }
1120 printf("\n%-12s <- %s", a->slab->name, a->name);
1121 active = a->slab->name;
1122 }
1123 else
1124 printf("%-15s -> %s\n", a->name, a->slab->name);
1125 }
1126 if (active)
1127 printf("\n");
1128}
1129
1130
1131static void rename_slabs(void)
1132{
1133 struct slabinfo *s;
1134 struct aliasinfo *a;
1135
1136 for (s = slabinfo; s < slabinfo + slabs; s++) {
1137 if (*s->name != ':')
1138 continue;
1139
1140 if (s->refs > 1 && !show_first_alias)
1141 continue;
1142
1143 a = find_one_alias(s);
1144
1145 if (a)
1146 s->name = a->name;
1147 else {
1148 s->name = "*";
1149 actual_slabs--;
1150 }
1151 }
1152}
1153
1154static int slab_mismatch(char *slab)
1155{
1156 return regexec(&pattern, slab, 0, NULL, 0);
1157}
1158
1159static void read_slab_dir(void)
1160{
1161 DIR *dir;
1162 struct dirent *de;
1163 struct slabinfo *slab = slabinfo;
1164 struct aliasinfo *alias = aliasinfo;
1165 char *p;
1166 char *t;
1167 int count;
1168
1169 if (chdir("/sys/kernel/slab") && chdir("/sys/slab"))
1170 fatal("SYSFS support for SLUB not active\n");
1171
1172 dir = opendir(".");
1173 while ((de = readdir(dir))) {
1174 if (de->d_name[0] == '.' ||
1175 (de->d_name[0] != ':' && slab_mismatch(de->d_name)))
1176 continue;
1177 switch (de->d_type) {
1178 case DT_LNK:
1179 alias->name = strdup(de->d_name);
1180 count = readlink(de->d_name, buffer, sizeof(buffer)-1);
1181
1182 if (count < 0)
1183 fatal("Cannot read symlink %s\n", de->d_name);
1184
1185 buffer[count] = 0;
1186 p = buffer + count;
1187 while (p > buffer && p[-1] != '/')
1188 p--;
1189 alias->ref = strdup(p);
1190 alias++;
1191 break;
1192 case DT_DIR:
1193 if (chdir(de->d_name))
1194 fatal("Unable to access slab %s\n", slab->name);
1195 slab->name = strdup(de->d_name);
1196 slab->alias = 0;
1197 slab->refs = 0;
1198 slab->aliases = get_obj("aliases");
1199 slab->align = get_obj("align");
1200 slab->cache_dma = get_obj("cache_dma");
1201 slab->cpu_slabs = get_obj("cpu_slabs");
1202 slab->destroy_by_rcu = get_obj("destroy_by_rcu");
1203 slab->hwcache_align = get_obj("hwcache_align");
1204 slab->object_size = get_obj("object_size");
1205 slab->objects = get_obj("objects");
1206 slab->objects_partial = get_obj("objects_partial");
1207 slab->objects_total = get_obj("objects_total");
1208 slab->objs_per_slab = get_obj("objs_per_slab");
1209 slab->order = get_obj("order");
1210 slab->partial = get_obj("partial");
1211 slab->partial = get_obj_and_str("partial", &t);
1212 decode_numa_list(slab->numa_partial, t);
1213 free(t);
1214 slab->poison = get_obj("poison");
1215 slab->reclaim_account = get_obj("reclaim_account");
1216 slab->red_zone = get_obj("red_zone");
1217 slab->sanity_checks = get_obj("sanity_checks");
1218 slab->slab_size = get_obj("slab_size");
1219 slab->slabs = get_obj_and_str("slabs", &t);
1220 decode_numa_list(slab->numa, t);
1221 free(t);
1222 slab->store_user = get_obj("store_user");
1223 slab->trace = get_obj("trace");
1224 slab->alloc_fastpath = get_obj("alloc_fastpath");
1225 slab->alloc_slowpath = get_obj("alloc_slowpath");
1226 slab->free_fastpath = get_obj("free_fastpath");
1227 slab->free_slowpath = get_obj("free_slowpath");
1228 slab->free_frozen= get_obj("free_frozen");
1229 slab->free_add_partial = get_obj("free_add_partial");
1230 slab->free_remove_partial = get_obj("free_remove_partial");
1231 slab->alloc_from_partial = get_obj("alloc_from_partial");
1232 slab->alloc_slab = get_obj("alloc_slab");
1233 slab->alloc_refill = get_obj("alloc_refill");
1234 slab->free_slab = get_obj("free_slab");
1235 slab->cpuslab_flush = get_obj("cpuslab_flush");
1236 slab->deactivate_full = get_obj("deactivate_full");
1237 slab->deactivate_empty = get_obj("deactivate_empty");
1238 slab->deactivate_to_head = get_obj("deactivate_to_head");
1239 slab->deactivate_to_tail = get_obj("deactivate_to_tail");
1240 slab->deactivate_remote_frees = get_obj("deactivate_remote_frees");
1241 slab->order_fallback = get_obj("order_fallback");
1242 slab->cmpxchg_double_cpu_fail = get_obj("cmpxchg_double_cpu_fail");
1243 slab->cmpxchg_double_fail = get_obj("cmpxchg_double_fail");
1244 slab->cpu_partial_alloc = get_obj("cpu_partial_alloc");
1245 slab->cpu_partial_free = get_obj("cpu_partial_free");
1246 slab->alloc_node_mismatch = get_obj("alloc_node_mismatch");
1247 slab->deactivate_bypass = get_obj("deactivate_bypass");
1248 chdir("..");
1249 if (slab->name[0] == ':')
1250 alias_targets++;
1251 slab++;
1252 break;
1253 default :
1254 fatal("Unknown file type %lx\n", de->d_type);
1255 }
1256 }
1257 closedir(dir);
1258 slabs = slab - slabinfo;
1259 actual_slabs = slabs;
1260 aliases = alias - aliasinfo;
1261 if (slabs > MAX_SLABS)
1262 fatal("Too many slabs\n");
1263 if (aliases > MAX_ALIASES)
1264 fatal("Too many aliases\n");
1265}
1266
1267static void output_slabs(void)
1268{
1269 struct slabinfo *slab;
1270 int lines = output_lines;
1271
1272 for (slab = slabinfo; (slab < slabinfo + slabs) &&
1273 lines != 0; slab++) {
1274
1275 if (slab->alias)
1276 continue;
1277
1278 if (lines != -1)
1279 lines--;
1280
1281 if (show_numa)
1282 slab_numa(slab, 0);
1283 else if (show_track)
1284 show_tracking(slab);
1285 else if (validate)
1286 slab_validate(slab);
1287 else if (shrink)
1288 slab_shrink(slab);
1289 else if (set_debug)
1290 slab_debug(slab);
1291 else if (show_ops)
1292 ops(slab);
1293 else if (show_slab)
1294 slabcache(slab);
1295 else if (show_report)
1296 report(slab);
1297 }
1298}
1299
1300static void xtotals(void)
1301{
1302 totals();
1303
1304 link_slabs();
1305 rename_slabs();
1306
1307 printf("\nSlabs sorted by size\n");
1308 printf("--------------------\n");
1309 sort_loss = 0;
1310 sort_size = 1;
1311 sort_slabs();
1312 output_slabs();
1313
1314 printf("\nSlabs sorted by loss\n");
1315 printf("--------------------\n");
1316 line = 0;
1317 sort_loss = 1;
1318 sort_size = 0;
1319 sort_slabs();
1320 output_slabs();
1321 printf("\n");
1322}
1323
1324struct option opts[] = {
1325 { "aliases", no_argument, NULL, 'a' },
1326 { "activity", no_argument, NULL, 'A' },
1327 { "debug", optional_argument, NULL, 'd' },
1328 { "display-activity", no_argument, NULL, 'D' },
1329 { "empty", no_argument, NULL, 'e' },
1330 { "first-alias", no_argument, NULL, 'f' },
1331 { "help", no_argument, NULL, 'h' },
1332 { "inverted", no_argument, NULL, 'i'},
1333 { "slabs", no_argument, NULL, 'l' },
1334 { "numa", no_argument, NULL, 'n' },
1335 { "ops", no_argument, NULL, 'o' },
1336 { "shrink", no_argument, NULL, 's' },
1337 { "report", no_argument, NULL, 'r' },
1338 { "Size", no_argument, NULL, 'S'},
1339 { "tracking", no_argument, NULL, 't'},
1340 { "Totals", no_argument, NULL, 'T'},
1341 { "validate", no_argument, NULL, 'v' },
1342 { "zero", no_argument, NULL, 'z' },
1343 { "1ref", no_argument, NULL, '1'},
1344 { "lines", required_argument, NULL, 'N'},
1345 { "Loss", no_argument, NULL, 'L'},
1346 { "Xtotals", no_argument, NULL, 'X'},
1347 { "Bytes", no_argument, NULL, 'B'},
1348 { NULL, 0, NULL, 0 }
1349};
1350
1351int main(int argc, char *argv[])
1352{
1353 int c;
1354 int err;
1355 char *pattern_source;
1356
1357 page_size = getpagesize();
1358
1359 while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTSN:LXB",
1360 opts, NULL)) != -1)
1361 switch (c) {
1362 case '1':
1363 show_single_ref = 1;
1364 break;
1365 case 'a':
1366 show_alias = 1;
1367 break;
1368 case 'A':
1369 sort_active = 1;
1370 break;
1371 case 'd':
1372 set_debug = 1;
1373 if (!debug_opt_scan(optarg))
1374 fatal("Invalid debug option '%s'\n", optarg);
1375 break;
1376 case 'D':
1377 show_activity = 1;
1378 break;
1379 case 'e':
1380 show_empty = 1;
1381 break;
1382 case 'f':
1383 show_first_alias = 1;
1384 break;
1385 case 'h':
1386 usage();
1387 return 0;
1388 case 'i':
1389 show_inverted = 1;
1390 break;
1391 case 'n':
1392 show_numa = 1;
1393 break;
1394 case 'o':
1395 show_ops = 1;
1396 break;
1397 case 'r':
1398 show_report = 1;
1399 break;
1400 case 's':
1401 shrink = 1;
1402 break;
1403 case 'l':
1404 show_slab = 1;
1405 break;
1406 case 't':
1407 show_track = 1;
1408 break;
1409 case 'v':
1410 validate = 1;
1411 break;
1412 case 'z':
1413 skip_zero = 0;
1414 break;
1415 case 'T':
1416 show_totals = 1;
1417 break;
1418 case 'S':
1419 sort_size = 1;
1420 break;
1421 case 'N':
1422 if (optarg) {
1423 output_lines = atoi(optarg);
1424 if (output_lines < 1)
1425 output_lines = 1;
1426 }
1427 break;
1428 case 'L':
1429 sort_loss = 1;
1430 break;
1431 case 'X':
1432 if (output_lines == -1)
1433 output_lines = 1;
1434 extended_totals = 1;
1435 show_bytes = 1;
1436 break;
1437 case 'B':
1438 show_bytes = 1;
1439 break;
1440 default:
1441 fatal("%s: Invalid option '%c'\n", argv[0], optopt);
1442
1443 }
1444
1445 if (!show_slab && !show_alias && !show_track && !show_report
1446 && !validate && !shrink && !set_debug && !show_ops)
1447 show_slab = 1;
1448
1449 if (argc > optind)
1450 pattern_source = argv[optind];
1451 else
1452 pattern_source = ".*";
1453
1454 err = regcomp(&pattern, pattern_source, REG_ICASE|REG_NOSUB);
1455 if (err)
1456 fatal("%s: Invalid pattern '%s' code %d\n",
1457 argv[0], pattern_source, err);
1458 read_slab_dir();
1459 if (show_alias) {
1460 alias();
1461 } else if (extended_totals) {
1462 xtotals();
1463 } else if (show_totals) {
1464 totals();
1465 } else {
1466 link_slabs();
1467 rename_slabs();
1468 sort_slabs();
1469 output_slabs();
1470 }
1471 return 0;
1472}