1 /*
2 * Slabinfo: Tool to get reports about slabs
3 *
4 * (C) 2007 sgi, Christoph Lameter
5 *
6 * Compile by:
7 *
8 * gcc -o slabinfo slabinfo.c
9 */
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <sys/types.h>
13 #include <dirent.h>
14 #include <strings.h>
15 #include <string.h>
16 #include <unistd.h>
17 #include <stdarg.h>
18 #include <getopt.h>
19 #include <regex.h>
20 #include <errno.h>
21
22 #define MAX_SLABS 500
23 #define MAX_ALIASES 500
24 #define MAX_NODES 1024
25
26 struct slabinfo {
27 char *name;
28 int alias;
29 int refs;
30 int aliases, align, cache_dma, cpu_slabs, destroy_by_rcu;
31 int hwcache_align, object_size, objs_per_slab;
32 int sanity_checks, slab_size, store_user, trace;
33 int order, poison, reclaim_account, red_zone;
34 unsigned long partial, objects, slabs, objects_partial, objects_total;
35 unsigned long alloc_fastpath, alloc_slowpath;
36 unsigned long free_fastpath, free_slowpath;
37 unsigned long free_frozen, free_add_partial, free_remove_partial;
38 unsigned long alloc_from_partial, alloc_slab, free_slab, alloc_refill;
39 unsigned long cpuslab_flush, deactivate_full, deactivate_empty;
40 unsigned long deactivate_to_head, deactivate_to_tail;
41 unsigned long deactivate_remote_frees, order_fallback;
42 int numa[MAX_NODES];
43 int numa_partial[MAX_NODES];
44 } slabinfo[MAX_SLABS];
45
46 struct aliasinfo {
47 char *name;
48 char *ref;
49 struct slabinfo *slab;
50 } aliasinfo[MAX_ALIASES];
51
52 int slabs = 0;
53 int actual_slabs = 0;
54 int aliases = 0;
55 int alias_targets = 0;
56 int highest_node = 0;
57
58 char buffer[4096];
59
60 int show_empty = 0;
61 int show_report = 0;
62 int show_alias = 0;
63 int show_slab = 0;
64 int skip_zero = 1;
65 int show_numa = 0;
66 int show_track = 0;
67 int show_first_alias = 0;
68 int validate = 0;
69 int shrink = 0;
70 int show_inverted = 0;
71 int show_single_ref = 0;
72 int show_totals = 0;
73 int sort_size = 0;
74 int sort_active = 0;
75 int set_debug = 0;
76 int show_ops = 0;
77 int show_activity = 0;
78
79 /* Debug options */
80 int sanity = 0;
81 int redzone = 0;
82 int poison = 0;
83 int tracking = 0;
84 int tracing = 0;
85
86 int page_size;
87
88 regex_t pattern;
89
fatal(const char * x,...)90 void fatal(const char *x, ...)
91 {
92 va_list ap;
93
94 va_start(ap, x);
95 vfprintf(stderr, x, ap);
96 va_end(ap);
97 exit(EXIT_FAILURE);
98 }
99
usage(void)100 void usage(void)
101 {
102 printf("slabinfo 5/7/2007. (c) 2007 sgi.\n\n"
103 "slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
104 "-a|--aliases Show aliases\n"
105 "-A|--activity Most active slabs first\n"
106 "-d<options>|--debug=<options> Set/Clear Debug options\n"
107 "-D|--display-active Switch line format to activity\n"
108 "-e|--empty Show empty slabs\n"
109 "-f|--first-alias Show first alias\n"
110 "-h|--help Show usage information\n"
111 "-i|--inverted Inverted list\n"
112 "-l|--slabs Show slabs\n"
113 "-n|--numa Show NUMA information\n"
114 "-o|--ops Show kmem_cache_ops\n"
115 "-s|--shrink Shrink slabs\n"
116 "-r|--report Detailed report on single slabs\n"
117 "-S|--Size Sort by size\n"
118 "-t|--tracking Show alloc/free information\n"
119 "-T|--Totals Show summary information\n"
120 "-v|--validate Validate slabs\n"
121 "-z|--zero Include empty slabs\n"
122 "-1|--1ref Single reference\n"
123 "\nValid debug options (FZPUT may be combined)\n"
124 "a / A Switch on all debug options (=FZUP)\n"
125 "- Switch off all debug options\n"
126 "f / F Sanity Checks (SLAB_DEBUG_FREE)\n"
127 "z / Z Redzoning\n"
128 "p / P Poisoning\n"
129 "u / U Tracking\n"
130 "t / T Tracing\n"
131 );
132 }
133
read_obj(const char * name)134 unsigned long read_obj(const char *name)
135 {
136 FILE *f = fopen(name, "r");
137
138 if (!f)
139 buffer[0] = 0;
140 else {
141 if (!fgets(buffer, sizeof(buffer), f))
142 buffer[0] = 0;
143 fclose(f);
144 if (buffer[strlen(buffer)] == '\n')
145 buffer[strlen(buffer)] = 0;
146 }
147 return strlen(buffer);
148 }
149
150
151 /*
152 * Get the contents of an attribute
153 */
get_obj(const char * name)154 unsigned long get_obj(const char *name)
155 {
156 if (!read_obj(name))
157 return 0;
158
159 return atol(buffer);
160 }
161
get_obj_and_str(const char * name,char ** x)162 unsigned long get_obj_and_str(const char *name, char **x)
163 {
164 unsigned long result = 0;
165 char *p;
166
167 *x = NULL;
168
169 if (!read_obj(name)) {
170 x = NULL;
171 return 0;
172 }
173 result = strtoul(buffer, &p, 10);
174 while (*p == ' ')
175 p++;
176 if (*p)
177 *x = strdup(p);
178 return result;
179 }
180
set_obj(struct slabinfo * s,const char * name,int n)181 void set_obj(struct slabinfo *s, const char *name, int n)
182 {
183 char x[100];
184 FILE *f;
185
186 snprintf(x, 100, "%s/%s", s->name, name);
187 f = fopen(x, "w");
188 if (!f)
189 fatal("Cannot write to %s\n", x);
190
191 fprintf(f, "%d\n", n);
192 fclose(f);
193 }
194
read_slab_obj(struct slabinfo * s,const char * name)195 unsigned long read_slab_obj(struct slabinfo *s, const char *name)
196 {
197 char x[100];
198 FILE *f;
199 size_t l;
200
201 snprintf(x, 100, "%s/%s", s->name, name);
202 f = fopen(x, "r");
203 if (!f) {
204 buffer[0] = 0;
205 l = 0;
206 } else {
207 l = fread(buffer, 1, sizeof(buffer), f);
208 buffer[l] = 0;
209 fclose(f);
210 }
211 return l;
212 }
213
214
215 /*
216 * Put a size string together
217 */
store_size(char * buffer,unsigned long value)218 int store_size(char *buffer, unsigned long value)
219 {
220 unsigned long divisor = 1;
221 char trailer = 0;
222 int n;
223
224 if (value > 1000000000UL) {
225 divisor = 100000000UL;
226 trailer = 'G';
227 } else if (value > 1000000UL) {
228 divisor = 100000UL;
229 trailer = 'M';
230 } else if (value > 1000UL) {
231 divisor = 100;
232 trailer = 'K';
233 }
234
235 value /= divisor;
236 n = sprintf(buffer, "%ld",value);
237 if (trailer) {
238 buffer[n] = trailer;
239 n++;
240 buffer[n] = 0;
241 }
242 if (divisor != 1) {
243 memmove(buffer + n - 2, buffer + n - 3, 4);
244 buffer[n-2] = '.';
245 n++;
246 }
247 return n;
248 }
249
decode_numa_list(int * numa,char * t)250 void decode_numa_list(int *numa, char *t)
251 {
252 int node;
253 int nr;
254
255 memset(numa, 0, MAX_NODES * sizeof(int));
256
257 if (!t)
258 return;
259
260 while (*t == 'N') {
261 t++;
262 node = strtoul(t, &t, 10);
263 if (*t == '=') {
264 t++;
265 nr = strtoul(t, &t, 10);
266 numa[node] = nr;
267 if (node > highest_node)
268 highest_node = node;
269 }
270 while (*t == ' ')
271 t++;
272 }
273 }
274
slab_validate(struct slabinfo * s)275 void slab_validate(struct slabinfo *s)
276 {
277 if (strcmp(s->name, "*") == 0)
278 return;
279
280 set_obj(s, "validate", 1);
281 }
282
slab_shrink(struct slabinfo * s)283 void slab_shrink(struct slabinfo *s)
284 {
285 if (strcmp(s->name, "*") == 0)
286 return;
287
288 set_obj(s, "shrink", 1);
289 }
290
291 int line = 0;
292
first_line(void)293 void first_line(void)
294 {
295 if (show_activity)
296 printf("Name Objects Alloc Free %%Fast Fallb O\n");
297 else
298 printf("Name Objects Objsize Space "
299 "Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n");
300 }
301
302 /*
303 * Find the shortest alias of a slab
304 */
find_one_alias(struct slabinfo * find)305 struct aliasinfo *find_one_alias(struct slabinfo *find)
306 {
307 struct aliasinfo *a;
308 struct aliasinfo *best = NULL;
309
310 for(a = aliasinfo;a < aliasinfo + aliases; a++) {
311 if (a->slab == find &&
312 (!best || strlen(best->name) < strlen(a->name))) {
313 best = a;
314 if (strncmp(a->name,"kmall", 5) == 0)
315 return best;
316 }
317 }
318 return best;
319 }
320
slab_size(struct slabinfo * s)321 unsigned long slab_size(struct slabinfo *s)
322 {
323 return s->slabs * (page_size << s->order);
324 }
325
slab_activity(struct slabinfo * s)326 unsigned long slab_activity(struct slabinfo *s)
327 {
328 return s->alloc_fastpath + s->free_fastpath +
329 s->alloc_slowpath + s->free_slowpath;
330 }
331
slab_numa(struct slabinfo * s,int mode)332 void slab_numa(struct slabinfo *s, int mode)
333 {
334 int node;
335
336 if (strcmp(s->name, "*") == 0)
337 return;
338
339 if (!highest_node) {
340 printf("\n%s: No NUMA information available.\n", s->name);
341 return;
342 }
343
344 if (skip_zero && !s->slabs)
345 return;
346
347 if (!line) {
348 printf("\n%-21s:", mode ? "NUMA nodes" : "Slab");
349 for(node = 0; node <= highest_node; node++)
350 printf(" %4d", node);
351 printf("\n----------------------");
352 for(node = 0; node <= highest_node; node++)
353 printf("-----");
354 printf("\n");
355 }
356 printf("%-21s ", mode ? "All slabs" : s->name);
357 for(node = 0; node <= highest_node; node++) {
358 char b[20];
359
360 store_size(b, s->numa[node]);
361 printf(" %4s", b);
362 }
363 printf("\n");
364 if (mode) {
365 printf("%-21s ", "Partial slabs");
366 for(node = 0; node <= highest_node; node++) {
367 char b[20];
368
369 store_size(b, s->numa_partial[node]);
370 printf(" %4s", b);
371 }
372 printf("\n");
373 }
374 line++;
375 }
376
show_tracking(struct slabinfo * s)377 void show_tracking(struct slabinfo *s)
378 {
379 printf("\n%s: Kernel object allocation\n", s->name);
380 printf("-----------------------------------------------------------------------\n");
381 if (read_slab_obj(s, "alloc_calls"))
382 printf(buffer);
383 else
384 printf("No Data\n");
385
386 printf("\n%s: Kernel object freeing\n", s->name);
387 printf("------------------------------------------------------------------------\n");
388 if (read_slab_obj(s, "free_calls"))
389 printf(buffer);
390 else
391 printf("No Data\n");
392
393 }
394
ops(struct slabinfo * s)395 void ops(struct slabinfo *s)
396 {
397 if (strcmp(s->name, "*") == 0)
398 return;
399
400 if (read_slab_obj(s, "ops")) {
401 printf("\n%s: kmem_cache operations\n", s->name);
402 printf("--------------------------------------------\n");
403 printf(buffer);
404 } else
405 printf("\n%s has no kmem_cache operations\n", s->name);
406 }
407
onoff(int x)408 const char *onoff(int x)
409 {
410 if (x)
411 return "On ";
412 return "Off";
413 }
414
slab_stats(struct slabinfo * s)415 void slab_stats(struct slabinfo *s)
416 {
417 unsigned long total_alloc;
418 unsigned long total_free;
419 unsigned long total;
420
421 if (!s->alloc_slab)
422 return;
423
424 total_alloc = s->alloc_fastpath + s->alloc_slowpath;
425 total_free = s->free_fastpath + s->free_slowpath;
426
427 if (!total_alloc)
428 return;
429
430 printf("\n");
431 printf("Slab Perf Counter Alloc Free %%Al %%Fr\n");
432 printf("--------------------------------------------------\n");
433 printf("Fastpath %8lu %8lu %3lu %3lu\n",
434 s->alloc_fastpath, s->free_fastpath,
435 s->alloc_fastpath * 100 / total_alloc,
436 s->free_fastpath * 100 / total_free);
437 printf("Slowpath %8lu %8lu %3lu %3lu\n",
438 total_alloc - s->alloc_fastpath, s->free_slowpath,
439 (total_alloc - s->alloc_fastpath) * 100 / total_alloc,
440 s->free_slowpath * 100 / total_free);
441 printf("Page Alloc %8lu %8lu %3lu %3lu\n",
442 s->alloc_slab, s->free_slab,
443 s->alloc_slab * 100 / total_alloc,
444 s->free_slab * 100 / total_free);
445 printf("Add partial %8lu %8lu %3lu %3lu\n",
446 s->deactivate_to_head + s->deactivate_to_tail,
447 s->free_add_partial,
448 (s->deactivate_to_head + s->deactivate_to_tail) * 100 / total_alloc,
449 s->free_add_partial * 100 / total_free);
450 printf("Remove partial %8lu %8lu %3lu %3lu\n",
451 s->alloc_from_partial, s->free_remove_partial,
452 s->alloc_from_partial * 100 / total_alloc,
453 s->free_remove_partial * 100 / total_free);
454
455 printf("RemoteObj/SlabFrozen %8lu %8lu %3lu %3lu\n",
456 s->deactivate_remote_frees, s->free_frozen,
457 s->deactivate_remote_frees * 100 / total_alloc,
458 s->free_frozen * 100 / total_free);
459
460 printf("Total %8lu %8lu\n\n", total_alloc, total_free);
461
462 if (s->cpuslab_flush)
463 printf("Flushes %8lu\n", s->cpuslab_flush);
464
465 if (s->alloc_refill)
466 printf("Refill %8lu\n", s->alloc_refill);
467
468 total = s->deactivate_full + s->deactivate_empty +
469 s->deactivate_to_head + s->deactivate_to_tail;
470
471 if (total)
472 printf("Deactivate Full=%lu(%lu%%) Empty=%lu(%lu%%) "
473 "ToHead=%lu(%lu%%) ToTail=%lu(%lu%%)\n",
474 s->deactivate_full, (s->deactivate_full * 100) / total,
475 s->deactivate_empty, (s->deactivate_empty * 100) / total,
476 s->deactivate_to_head, (s->deactivate_to_head * 100) / total,
477 s->deactivate_to_tail, (s->deactivate_to_tail * 100) / total);
478 }
479
report(struct slabinfo * s)480 void report(struct slabinfo *s)
481 {
482 if (strcmp(s->name, "*") == 0)
483 return;
484
485 printf("\nSlabcache: %-20s Aliases: %2d Order : %2d Objects: %lu\n",
486 s->name, s->aliases, s->order, s->objects);
487 if (s->hwcache_align)
488 printf("** Hardware cacheline aligned\n");
489 if (s->cache_dma)
490 printf("** Memory is allocated in a special DMA zone\n");
491 if (s->destroy_by_rcu)
492 printf("** Slabs are destroyed via RCU\n");
493 if (s->reclaim_account)
494 printf("** Reclaim accounting active\n");
495
496 printf("\nSizes (bytes) Slabs Debug Memory\n");
497 printf("------------------------------------------------------------------------\n");
498 printf("Object : %7d Total : %7ld Sanity Checks : %s Total: %7ld\n",
499 s->object_size, s->slabs, onoff(s->sanity_checks),
500 s->slabs * (page_size << s->order));
501 printf("SlabObj: %7d Full : %7ld Redzoning : %s Used : %7ld\n",
502 s->slab_size, s->slabs - s->partial - s->cpu_slabs,
503 onoff(s->red_zone), s->objects * s->object_size);
504 printf("SlabSiz: %7d Partial: %7ld Poisoning : %s Loss : %7ld\n",
505 page_size << s->order, s->partial, onoff(s->poison),
506 s->slabs * (page_size << s->order) - s->objects * s->object_size);
507 printf("Loss : %7d CpuSlab: %7d Tracking : %s Lalig: %7ld\n",
508 s->slab_size - s->object_size, s->cpu_slabs, onoff(s->store_user),
509 (s->slab_size - s->object_size) * s->objects);
510 printf("Align : %7d Objects: %7d Tracing : %s Lpadd: %7ld\n",
511 s->align, s->objs_per_slab, onoff(s->trace),
512 ((page_size << s->order) - s->objs_per_slab * s->slab_size) *
513 s->slabs);
514
515 ops(s);
516 show_tracking(s);
517 slab_numa(s, 1);
518 slab_stats(s);
519 }
520
slabcache(struct slabinfo * s)521 void slabcache(struct slabinfo *s)
522 {
523 char size_str[20];
524 char dist_str[40];
525 char flags[20];
526 char *p = flags;
527
528 if (strcmp(s->name, "*") == 0)
529 return;
530
531 if (actual_slabs == 1) {
532 report(s);
533 return;
534 }
535
536 if (skip_zero && !show_empty && !s->slabs)
537 return;
538
539 if (show_empty && s->slabs)
540 return;
541
542 store_size(size_str, slab_size(s));
543 snprintf(dist_str, 40, "%lu/%lu/%d", s->slabs - s->cpu_slabs,
544 s->partial, s->cpu_slabs);
545
546 if (!line++)
547 first_line();
548
549 if (s->aliases)
550 *p++ = '*';
551 if (s->cache_dma)
552 *p++ = 'd';
553 if (s->hwcache_align)
554 *p++ = 'A';
555 if (s->poison)
556 *p++ = 'P';
557 if (s->reclaim_account)
558 *p++ = 'a';
559 if (s->red_zone)
560 *p++ = 'Z';
561 if (s->sanity_checks)
562 *p++ = 'F';
563 if (s->store_user)
564 *p++ = 'U';
565 if (s->trace)
566 *p++ = 'T';
567
568 *p = 0;
569 if (show_activity) {
570 unsigned long total_alloc;
571 unsigned long total_free;
572
573 total_alloc = s->alloc_fastpath + s->alloc_slowpath;
574 total_free = s->free_fastpath + s->free_slowpath;
575
576 printf("%-21s %8ld %10ld %10ld %3ld %3ld %5ld %1d\n",
577 s->name, s->objects,
578 total_alloc, total_free,
579 total_alloc ? (s->alloc_fastpath * 100 / total_alloc) : 0,
580 total_free ? (s->free_fastpath * 100 / total_free) : 0,
581 s->order_fallback, s->order);
582 }
583 else
584 printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
585 s->name, s->objects, s->object_size, size_str, dist_str,
586 s->objs_per_slab, s->order,
587 s->slabs ? (s->partial * 100) / s->slabs : 100,
588 s->slabs ? (s->objects * s->object_size * 100) /
589 (s->slabs * (page_size << s->order)) : 100,
590 flags);
591 }
592
593 /*
594 * Analyze debug options. Return false if something is amiss.
595 */
debug_opt_scan(char * opt)596 int debug_opt_scan(char *opt)
597 {
598 if (!opt || !opt[0] || strcmp(opt, "-") == 0)
599 return 1;
600
601 if (strcasecmp(opt, "a") == 0) {
602 sanity = 1;
603 poison = 1;
604 redzone = 1;
605 tracking = 1;
606 return 1;
607 }
608
609 for ( ; *opt; opt++)
610 switch (*opt) {
611 case 'F' : case 'f':
612 if (sanity)
613 return 0;
614 sanity = 1;
615 break;
616 case 'P' : case 'p':
617 if (poison)
618 return 0;
619 poison = 1;
620 break;
621
622 case 'Z' : case 'z':
623 if (redzone)
624 return 0;
625 redzone = 1;
626 break;
627
628 case 'U' : case 'u':
629 if (tracking)
630 return 0;
631 tracking = 1;
632 break;
633
634 case 'T' : case 't':
635 if (tracing)
636 return 0;
637 tracing = 1;
638 break;
639 default:
640 return 0;
641 }
642 return 1;
643 }
644
slab_empty(struct slabinfo * s)645 int slab_empty(struct slabinfo *s)
646 {
647 if (s->objects > 0)
648 return 0;
649
650 /*
651 * We may still have slabs even if there are no objects. Shrinking will
652 * remove them.
653 */
654 if (s->slabs != 0)
655 set_obj(s, "shrink", 1);
656
657 return 1;
658 }
659
slab_debug(struct slabinfo * s)660 void slab_debug(struct slabinfo *s)
661 {
662 if (strcmp(s->name, "*") == 0)
663 return;
664
665 if (sanity && !s->sanity_checks) {
666 set_obj(s, "sanity", 1);
667 }
668 if (!sanity && s->sanity_checks) {
669 if (slab_empty(s))
670 set_obj(s, "sanity", 0);
671 else
672 fprintf(stderr, "%s not empty cannot disable sanity checks\n", s->name);
673 }
674 if (redzone && !s->red_zone) {
675 if (slab_empty(s))
676 set_obj(s, "red_zone", 1);
677 else
678 fprintf(stderr, "%s not empty cannot enable redzoning\n", s->name);
679 }
680 if (!redzone && s->red_zone) {
681 if (slab_empty(s))
682 set_obj(s, "red_zone", 0);
683 else
684 fprintf(stderr, "%s not empty cannot disable redzoning\n", s->name);
685 }
686 if (poison && !s->poison) {
687 if (slab_empty(s))
688 set_obj(s, "poison", 1);
689 else
690 fprintf(stderr, "%s not empty cannot enable poisoning\n", s->name);
691 }
692 if (!poison && s->poison) {
693 if (slab_empty(s))
694 set_obj(s, "poison", 0);
695 else
696 fprintf(stderr, "%s not empty cannot disable poisoning\n", s->name);
697 }
698 if (tracking && !s->store_user) {
699 if (slab_empty(s))
700 set_obj(s, "store_user", 1);
701 else
702 fprintf(stderr, "%s not empty cannot enable tracking\n", s->name);
703 }
704 if (!tracking && s->store_user) {
705 if (slab_empty(s))
706 set_obj(s, "store_user", 0);
707 else
708 fprintf(stderr, "%s not empty cannot disable tracking\n", s->name);
709 }
710 if (tracing && !s->trace) {
711 if (slabs == 1)
712 set_obj(s, "trace", 1);
713 else
714 fprintf(stderr, "%s can only enable trace for one slab at a time\n", s->name);
715 }
716 if (!tracing && s->trace)
717 set_obj(s, "trace", 1);
718 }
719
totals(void)720 void totals(void)
721 {
722 struct slabinfo *s;
723
724 int used_slabs = 0;
725 char b1[20], b2[20], b3[20], b4[20];
726 unsigned long long max = 1ULL << 63;
727
728 /* Object size */
729 unsigned long long min_objsize = max, max_objsize = 0, avg_objsize;
730
731 /* Number of partial slabs in a slabcache */
732 unsigned long long min_partial = max, max_partial = 0,
733 avg_partial, total_partial = 0;
734
735 /* Number of slabs in a slab cache */
736 unsigned long long min_slabs = max, max_slabs = 0,
737 avg_slabs, total_slabs = 0;
738
739 /* Size of the whole slab */
740 unsigned long long min_size = max, max_size = 0,
741 avg_size, total_size = 0;
742
743 /* Bytes used for object storage in a slab */
744 unsigned long long min_used = max, max_used = 0,
745 avg_used, total_used = 0;
746
747 /* Waste: Bytes used for alignment and padding */
748 unsigned long long min_waste = max, max_waste = 0,
749 avg_waste, total_waste = 0;
750 /* Number of objects in a slab */
751 unsigned long long min_objects = max, max_objects = 0,
752 avg_objects, total_objects = 0;
753 /* Waste per object */
754 unsigned long long min_objwaste = max,
755 max_objwaste = 0, avg_objwaste,
756 total_objwaste = 0;
757
758 /* Memory per object */
759 unsigned long long min_memobj = max,
760 max_memobj = 0, avg_memobj,
761 total_objsize = 0;
762
763 /* Percentage of partial slabs per slab */
764 unsigned long min_ppart = 100, max_ppart = 0,
765 avg_ppart, total_ppart = 0;
766
767 /* Number of objects in partial slabs */
768 unsigned long min_partobj = max, max_partobj = 0,
769 avg_partobj, total_partobj = 0;
770
771 /* Percentage of partial objects of all objects in a slab */
772 unsigned long min_ppartobj = 100, max_ppartobj = 0,
773 avg_ppartobj, total_ppartobj = 0;
774
775
776 for (s = slabinfo; s < slabinfo + slabs; s++) {
777 unsigned long long size;
778 unsigned long used;
779 unsigned long long wasted;
780 unsigned long long objwaste;
781 unsigned long percentage_partial_slabs;
782 unsigned long percentage_partial_objs;
783
784 if (!s->slabs || !s->objects)
785 continue;
786
787 used_slabs++;
788
789 size = slab_size(s);
790 used = s->objects * s->object_size;
791 wasted = size - used;
792 objwaste = s->slab_size - s->object_size;
793
794 percentage_partial_slabs = s->partial * 100 / s->slabs;
795 if (percentage_partial_slabs > 100)
796 percentage_partial_slabs = 100;
797
798 percentage_partial_objs = s->objects_partial * 100
799 / s->objects;
800
801 if (percentage_partial_objs > 100)
802 percentage_partial_objs = 100;
803
804 if (s->object_size < min_objsize)
805 min_objsize = s->object_size;
806 if (s->partial < min_partial)
807 min_partial = s->partial;
808 if (s->slabs < min_slabs)
809 min_slabs = s->slabs;
810 if (size < min_size)
811 min_size = size;
812 if (wasted < min_waste)
813 min_waste = wasted;
814 if (objwaste < min_objwaste)
815 min_objwaste = objwaste;
816 if (s->objects < min_objects)
817 min_objects = s->objects;
818 if (used < min_used)
819 min_used = used;
820 if (s->objects_partial < min_partobj)
821 min_partobj = s->objects_partial;
822 if (percentage_partial_slabs < min_ppart)
823 min_ppart = percentage_partial_slabs;
824 if (percentage_partial_objs < min_ppartobj)
825 min_ppartobj = percentage_partial_objs;
826 if (s->slab_size < min_memobj)
827 min_memobj = s->slab_size;
828
829 if (s->object_size > max_objsize)
830 max_objsize = s->object_size;
831 if (s->partial > max_partial)
832 max_partial = s->partial;
833 if (s->slabs > max_slabs)
834 max_slabs = s->slabs;
835 if (size > max_size)
836 max_size = size;
837 if (wasted > max_waste)
838 max_waste = wasted;
839 if (objwaste > max_objwaste)
840 max_objwaste = objwaste;
841 if (s->objects > max_objects)
842 max_objects = s->objects;
843 if (used > max_used)
844 max_used = used;
845 if (s->objects_partial > max_partobj)
846 max_partobj = s->objects_partial;
847 if (percentage_partial_slabs > max_ppart)
848 max_ppart = percentage_partial_slabs;
849 if (percentage_partial_objs > max_ppartobj)
850 max_ppartobj = percentage_partial_objs;
851 if (s->slab_size > max_memobj)
852 max_memobj = s->slab_size;
853
854 total_partial += s->partial;
855 total_slabs += s->slabs;
856 total_size += size;
857 total_waste += wasted;
858
859 total_objects += s->objects;
860 total_used += used;
861 total_partobj += s->objects_partial;
862 total_ppart += percentage_partial_slabs;
863 total_ppartobj += percentage_partial_objs;
864
865 total_objwaste += s->objects * objwaste;
866 total_objsize += s->objects * s->slab_size;
867 }
868
869 if (!total_objects) {
870 printf("No objects\n");
871 return;
872 }
873 if (!used_slabs) {
874 printf("No slabs\n");
875 return;
876 }
877
878 /* Per slab averages */
879 avg_partial = total_partial / used_slabs;
880 avg_slabs = total_slabs / used_slabs;
881 avg_size = total_size / used_slabs;
882 avg_waste = total_waste / used_slabs;
883
884 avg_objects = total_objects / used_slabs;
885 avg_used = total_used / used_slabs;
886 avg_partobj = total_partobj / used_slabs;
887 avg_ppart = total_ppart / used_slabs;
888 avg_ppartobj = total_ppartobj / used_slabs;
889
890 /* Per object object sizes */
891 avg_objsize = total_used / total_objects;
892 avg_objwaste = total_objwaste / total_objects;
893 avg_partobj = total_partobj * 100 / total_objects;
894 avg_memobj = total_objsize / total_objects;
895
896 printf("Slabcache Totals\n");
897 printf("----------------\n");
898 printf("Slabcaches : %3d Aliases : %3d->%-3d Active: %3d\n",
899 slabs, aliases, alias_targets, used_slabs);
900
901 store_size(b1, total_size);store_size(b2, total_waste);
902 store_size(b3, total_waste * 100 / total_used);
903 printf("Memory used: %6s # Loss : %6s MRatio:%6s%%\n", b1, b2, b3);
904
905 store_size(b1, total_objects);store_size(b2, total_partobj);
906 store_size(b3, total_partobj * 100 / total_objects);
907 printf("# Objects : %6s # PartObj: %6s ORatio:%6s%%\n", b1, b2, b3);
908
909 printf("\n");
910 printf("Per Cache Average Min Max Total\n");
911 printf("---------------------------------------------------------\n");
912
913 store_size(b1, avg_objects);store_size(b2, min_objects);
914 store_size(b3, max_objects);store_size(b4, total_objects);
915 printf("#Objects %10s %10s %10s %10s\n",
916 b1, b2, b3, b4);
917
918 store_size(b1, avg_slabs);store_size(b2, min_slabs);
919 store_size(b3, max_slabs);store_size(b4, total_slabs);
920 printf("#Slabs %10s %10s %10s %10s\n",
921 b1, b2, b3, b4);
922
923 store_size(b1, avg_partial);store_size(b2, min_partial);
924 store_size(b3, max_partial);store_size(b4, total_partial);
925 printf("#PartSlab %10s %10s %10s %10s\n",
926 b1, b2, b3, b4);
927 store_size(b1, avg_ppart);store_size(b2, min_ppart);
928 store_size(b3, max_ppart);
929 store_size(b4, total_partial * 100 / total_slabs);
930 printf("%%PartSlab%10s%% %10s%% %10s%% %10s%%\n",
931 b1, b2, b3, b4);
932
933 store_size(b1, avg_partobj);store_size(b2, min_partobj);
934 store_size(b3, max_partobj);
935 store_size(b4, total_partobj);
936 printf("PartObjs %10s %10s %10s %10s\n",
937 b1, b2, b3, b4);
938
939 store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj);
940 store_size(b3, max_ppartobj);
941 store_size(b4, total_partobj * 100 / total_objects);
942 printf("%% PartObj%10s%% %10s%% %10s%% %10s%%\n",
943 b1, b2, b3, b4);
944
945 store_size(b1, avg_size);store_size(b2, min_size);
946 store_size(b3, max_size);store_size(b4, total_size);
947 printf("Memory %10s %10s %10s %10s\n",
948 b1, b2, b3, b4);
949
950 store_size(b1, avg_used);store_size(b2, min_used);
951 store_size(b3, max_used);store_size(b4, total_used);
952 printf("Used %10s %10s %10s %10s\n",
953 b1, b2, b3, b4);
954
955 store_size(b1, avg_waste);store_size(b2, min_waste);
956 store_size(b3, max_waste);store_size(b4, total_waste);
957 printf("Loss %10s %10s %10s %10s\n",
958 b1, b2, b3, b4);
959
960 printf("\n");
961 printf("Per Object Average Min Max\n");
962 printf("---------------------------------------------\n");
963
964 store_size(b1, avg_memobj);store_size(b2, min_memobj);
965 store_size(b3, max_memobj);
966 printf("Memory %10s %10s %10s\n",
967 b1, b2, b3);
968 store_size(b1, avg_objsize);store_size(b2, min_objsize);
969 store_size(b3, max_objsize);
970 printf("User %10s %10s %10s\n",
971 b1, b2, b3);
972
973 store_size(b1, avg_objwaste);store_size(b2, min_objwaste);
974 store_size(b3, max_objwaste);
975 printf("Loss %10s %10s %10s\n",
976 b1, b2, b3);
977 }
978
sort_slabs(void)979 void sort_slabs(void)
980 {
981 struct slabinfo *s1,*s2;
982
983 for (s1 = slabinfo; s1 < slabinfo + slabs; s1++) {
984 for (s2 = s1 + 1; s2 < slabinfo + slabs; s2++) {
985 int result;
986
987 if (sort_size)
988 result = slab_size(s1) < slab_size(s2);
989 else if (sort_active)
990 result = slab_activity(s1) < slab_activity(s2);
991 else
992 result = strcasecmp(s1->name, s2->name);
993
994 if (show_inverted)
995 result = -result;
996
997 if (result > 0) {
998 struct slabinfo t;
999
1000 memcpy(&t, s1, sizeof(struct slabinfo));
1001 memcpy(s1, s2, sizeof(struct slabinfo));
1002 memcpy(s2, &t, sizeof(struct slabinfo));
1003 }
1004 }
1005 }
1006 }
1007
sort_aliases(void)1008 void sort_aliases(void)
1009 {
1010 struct aliasinfo *a1,*a2;
1011
1012 for (a1 = aliasinfo; a1 < aliasinfo + aliases; a1++) {
1013 for (a2 = a1 + 1; a2 < aliasinfo + aliases; a2++) {
1014 char *n1, *n2;
1015
1016 n1 = a1->name;
1017 n2 = a2->name;
1018 if (show_alias && !show_inverted) {
1019 n1 = a1->ref;
1020 n2 = a2->ref;
1021 }
1022 if (strcasecmp(n1, n2) > 0) {
1023 struct aliasinfo t;
1024
1025 memcpy(&t, a1, sizeof(struct aliasinfo));
1026 memcpy(a1, a2, sizeof(struct aliasinfo));
1027 memcpy(a2, &t, sizeof(struct aliasinfo));
1028 }
1029 }
1030 }
1031 }
1032
link_slabs(void)1033 void link_slabs(void)
1034 {
1035 struct aliasinfo *a;
1036 struct slabinfo *s;
1037
1038 for (a = aliasinfo; a < aliasinfo + aliases; a++) {
1039
1040 for (s = slabinfo; s < slabinfo + slabs; s++)
1041 if (strcmp(a->ref, s->name) == 0) {
1042 a->slab = s;
1043 s->refs++;
1044 break;
1045 }
1046 if (s == slabinfo + slabs)
1047 fatal("Unresolved alias %s\n", a->ref);
1048 }
1049 }
1050
alias(void)1051 void alias(void)
1052 {
1053 struct aliasinfo *a;
1054 char *active = NULL;
1055
1056 sort_aliases();
1057 link_slabs();
1058
1059 for(a = aliasinfo; a < aliasinfo + aliases; a++) {
1060
1061 if (!show_single_ref && a->slab->refs == 1)
1062 continue;
1063
1064 if (!show_inverted) {
1065 if (active) {
1066 if (strcmp(a->slab->name, active) == 0) {
1067 printf(" %s", a->name);
1068 continue;
1069 }
1070 }
1071 printf("\n%-12s <- %s", a->slab->name, a->name);
1072 active = a->slab->name;
1073 }
1074 else
1075 printf("%-20s -> %s\n", a->name, a->slab->name);
1076 }
1077 if (active)
1078 printf("\n");
1079 }
1080
1081
rename_slabs(void)1082 void rename_slabs(void)
1083 {
1084 struct slabinfo *s;
1085 struct aliasinfo *a;
1086
1087 for (s = slabinfo; s < slabinfo + slabs; s++) {
1088 if (*s->name != ':')
1089 continue;
1090
1091 if (s->refs > 1 && !show_first_alias)
1092 continue;
1093
1094 a = find_one_alias(s);
1095
1096 if (a)
1097 s->name = a->name;
1098 else {
1099 s->name = "*";
1100 actual_slabs--;
1101 }
1102 }
1103 }
1104
slab_mismatch(char * slab)1105 int slab_mismatch(char *slab)
1106 {
1107 return regexec(&pattern, slab, 0, NULL, 0);
1108 }
1109
read_slab_dir(void)1110 void read_slab_dir(void)
1111 {
1112 DIR *dir;
1113 struct dirent *de;
1114 struct slabinfo *slab = slabinfo;
1115 struct aliasinfo *alias = aliasinfo;
1116 char *p;
1117 char *t;
1118 int count;
1119
1120 if (chdir("/sys/kernel/slab") && chdir("/sys/slab"))
1121 fatal("SYSFS support for SLUB not active\n");
1122
1123 dir = opendir(".");
1124 while ((de = readdir(dir))) {
1125 if (de->d_name[0] == '.' ||
1126 (de->d_name[0] != ':' && slab_mismatch(de->d_name)))
1127 continue;
1128 switch (de->d_type) {
1129 case DT_LNK:
1130 alias->name = strdup(de->d_name);
1131 count = readlink(de->d_name, buffer, sizeof(buffer));
1132
1133 if (count < 0)
1134 fatal("Cannot read symlink %s\n", de->d_name);
1135
1136 buffer[count] = 0;
1137 p = buffer + count;
1138 while (p > buffer && p[-1] != '/')
1139 p--;
1140 alias->ref = strdup(p);
1141 alias++;
1142 break;
1143 case DT_DIR:
1144 if (chdir(de->d_name))
1145 fatal("Unable to access slab %s\n", slab->name);
1146 slab->name = strdup(de->d_name);
1147 slab->alias = 0;
1148 slab->refs = 0;
1149 slab->aliases = get_obj("aliases");
1150 slab->align = get_obj("align");
1151 slab->cache_dma = get_obj("cache_dma");
1152 slab->cpu_slabs = get_obj("cpu_slabs");
1153 slab->destroy_by_rcu = get_obj("destroy_by_rcu");
1154 slab->hwcache_align = get_obj("hwcache_align");
1155 slab->object_size = get_obj("object_size");
1156 slab->objects = get_obj("objects");
1157 slab->objects_partial = get_obj("objects_partial");
1158 slab->objects_total = get_obj("objects_total");
1159 slab->objs_per_slab = get_obj("objs_per_slab");
1160 slab->order = get_obj("order");
1161 slab->partial = get_obj("partial");
1162 slab->partial = get_obj_and_str("partial", &t);
1163 decode_numa_list(slab->numa_partial, t);
1164 free(t);
1165 slab->poison = get_obj("poison");
1166 slab->reclaim_account = get_obj("reclaim_account");
1167 slab->red_zone = get_obj("red_zone");
1168 slab->sanity_checks = get_obj("sanity_checks");
1169 slab->slab_size = get_obj("slab_size");
1170 slab->slabs = get_obj_and_str("slabs", &t);
1171 decode_numa_list(slab->numa, t);
1172 free(t);
1173 slab->store_user = get_obj("store_user");
1174 slab->trace = get_obj("trace");
1175 slab->alloc_fastpath = get_obj("alloc_fastpath");
1176 slab->alloc_slowpath = get_obj("alloc_slowpath");
1177 slab->free_fastpath = get_obj("free_fastpath");
1178 slab->free_slowpath = get_obj("free_slowpath");
1179 slab->free_frozen= get_obj("free_frozen");
1180 slab->free_add_partial = get_obj("free_add_partial");
1181 slab->free_remove_partial = get_obj("free_remove_partial");
1182 slab->alloc_from_partial = get_obj("alloc_from_partial");
1183 slab->alloc_slab = get_obj("alloc_slab");
1184 slab->alloc_refill = get_obj("alloc_refill");
1185 slab->free_slab = get_obj("free_slab");
1186 slab->cpuslab_flush = get_obj("cpuslab_flush");
1187 slab->deactivate_full = get_obj("deactivate_full");
1188 slab->deactivate_empty = get_obj("deactivate_empty");
1189 slab->deactivate_to_head = get_obj("deactivate_to_head");
1190 slab->deactivate_to_tail = get_obj("deactivate_to_tail");
1191 slab->deactivate_remote_frees = get_obj("deactivate_remote_frees");
1192 slab->order_fallback = get_obj("order_fallback");
1193 chdir("..");
1194 if (slab->name[0] == ':')
1195 alias_targets++;
1196 slab++;
1197 break;
1198 default :
1199 fatal("Unknown file type %lx\n", de->d_type);
1200 }
1201 }
1202 closedir(dir);
1203 slabs = slab - slabinfo;
1204 actual_slabs = slabs;
1205 aliases = alias - aliasinfo;
1206 if (slabs > MAX_SLABS)
1207 fatal("Too many slabs\n");
1208 if (aliases > MAX_ALIASES)
1209 fatal("Too many aliases\n");
1210 }
1211
output_slabs(void)1212 void output_slabs(void)
1213 {
1214 struct slabinfo *slab;
1215
1216 for (slab = slabinfo; slab < slabinfo + slabs; slab++) {
1217
1218 if (slab->alias)
1219 continue;
1220
1221
1222 if (show_numa)
1223 slab_numa(slab, 0);
1224 else if (show_track)
1225 show_tracking(slab);
1226 else if (validate)
1227 slab_validate(slab);
1228 else if (shrink)
1229 slab_shrink(slab);
1230 else if (set_debug)
1231 slab_debug(slab);
1232 else if (show_ops)
1233 ops(slab);
1234 else if (show_slab)
1235 slabcache(slab);
1236 else if (show_report)
1237 report(slab);
1238 }
1239 }
1240
1241 struct option opts[] = {
1242 { "aliases", 0, NULL, 'a' },
1243 { "activity", 0, NULL, 'A' },
1244 { "debug", 2, NULL, 'd' },
1245 { "display-activity", 0, NULL, 'D' },
1246 { "empty", 0, NULL, 'e' },
1247 { "first-alias", 0, NULL, 'f' },
1248 { "help", 0, NULL, 'h' },
1249 { "inverted", 0, NULL, 'i'},
1250 { "numa", 0, NULL, 'n' },
1251 { "ops", 0, NULL, 'o' },
1252 { "report", 0, NULL, 'r' },
1253 { "shrink", 0, NULL, 's' },
1254 { "slabs", 0, NULL, 'l' },
1255 { "track", 0, NULL, 't'},
1256 { "validate", 0, NULL, 'v' },
1257 { "zero", 0, NULL, 'z' },
1258 { "1ref", 0, NULL, '1'},
1259 { NULL, 0, NULL, 0 }
1260 };
1261
main(int argc,char * argv[])1262 int main(int argc, char *argv[])
1263 {
1264 int c;
1265 int err;
1266 char *pattern_source;
1267
1268 page_size = getpagesize();
1269
1270 while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTS",
1271 opts, NULL)) != -1)
1272 switch (c) {
1273 case '1':
1274 show_single_ref = 1;
1275 break;
1276 case 'a':
1277 show_alias = 1;
1278 break;
1279 case 'A':
1280 sort_active = 1;
1281 break;
1282 case 'd':
1283 set_debug = 1;
1284 if (!debug_opt_scan(optarg))
1285 fatal("Invalid debug option '%s'\n", optarg);
1286 break;
1287 case 'D':
1288 show_activity = 1;
1289 break;
1290 case 'e':
1291 show_empty = 1;
1292 break;
1293 case 'f':
1294 show_first_alias = 1;
1295 break;
1296 case 'h':
1297 usage();
1298 return 0;
1299 case 'i':
1300 show_inverted = 1;
1301 break;
1302 case 'n':
1303 show_numa = 1;
1304 break;
1305 case 'o':
1306 show_ops = 1;
1307 break;
1308 case 'r':
1309 show_report = 1;
1310 break;
1311 case 's':
1312 shrink = 1;
1313 break;
1314 case 'l':
1315 show_slab = 1;
1316 break;
1317 case 't':
1318 show_track = 1;
1319 break;
1320 case 'v':
1321 validate = 1;
1322 break;
1323 case 'z':
1324 skip_zero = 0;
1325 break;
1326 case 'T':
1327 show_totals = 1;
1328 break;
1329 case 'S':
1330 sort_size = 1;
1331 break;
1332
1333 default:
1334 fatal("%s: Invalid option '%c'\n", argv[0], optopt);
1335
1336 }
1337
1338 if (!show_slab && !show_alias && !show_track && !show_report
1339 && !validate && !shrink && !set_debug && !show_ops)
1340 show_slab = 1;
1341
1342 if (argc > optind)
1343 pattern_source = argv[optind];
1344 else
1345 pattern_source = ".*";
1346
1347 err = regcomp(&pattern, pattern_source, REG_ICASE|REG_NOSUB);
1348 if (err)
1349 fatal("%s: Invalid pattern '%s' code %d\n",
1350 argv[0], pattern_source, err);
1351 read_slab_dir();
1352 if (show_alias)
1353 alias();
1354 else
1355 if (show_totals)
1356 totals();
1357 else {
1358 link_slabs();
1359 rename_slabs();
1360 sort_slabs();
1361 output_slabs();
1362 }
1363 return 0;
1364 }
1365