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intel_menlo: fix build warning
[linux-2.6/btrfs-unstable.git] / Documentation / vm / slabinfo.c
blobd3ce295bffac59ce6ca9a4be032194210e5ac41f
1 /*
2 * Slabinfo: Tool to get reports about slabs
3 *
4 * (C) 2007 sgi, Christoph Lameter <clameter@sgi.com>
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;
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
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
100 void usage(void)
101 {
102 printf("slabinfo 5/7/2007. (c) 2007 sgi. clameter@sgi.com\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
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 */
154 unsigned long get_obj(const char *name)
155 {
156 if (!read_obj(name))
157 return 0;
158
159 return atol(buffer);
160 }
161
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
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
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 */
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
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
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
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
293 void first_line(void)
294 {
295 if (show_activity)
296 printf("Name Objects Alloc Free %%Fast\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 */
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
321 unsigned long slab_size(struct slabinfo *s)
322 {
323 return s->slabs * (page_size << s->order);
324 }
325
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
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
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
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
408 const char *onoff(int x)
409 {
410 if (x)
411 return "On ";
412 return "Off";
413 }
414
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
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
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 %8ld %8ld %3ld %3ld \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 }
582 else
583 printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
584 s->name, s->objects, s->object_size, size_str, dist_str,
585 s->objs_per_slab, s->order,
586 s->slabs ? (s->partial * 100) / s->slabs : 100,
587 s->slabs ? (s->objects * s->object_size * 100) /
588 (s->slabs * (page_size << s->order)) : 100,
589 flags);
590 }
591
592 /*
593 * Analyze debug options. Return false if something is amiss.
594 */
595 int debug_opt_scan(char *opt)
596 {
597 if (!opt || !opt[0] || strcmp(opt, "-") == 0)
598 return 1;
599
600 if (strcasecmp(opt, "a") == 0) {
601 sanity = 1;
602 poison = 1;
603 redzone = 1;
604 tracking = 1;
605 return 1;
606 }
607
608 for ( ; *opt; opt++)
609 switch (*opt) {
610 case 'F' : case 'f':
611 if (sanity)
612 return 0;
613 sanity = 1;
614 break;
615 case 'P' : case 'p':
616 if (poison)
617 return 0;
618 poison = 1;
619 break;
620
621 case 'Z' : case 'z':
622 if (redzone)
623 return 0;
624 redzone = 1;
625 break;
626
627 case 'U' : case 'u':
628 if (tracking)
629 return 0;
630 tracking = 1;
631 break;
632
633 case 'T' : case 't':
634 if (tracing)
635 return 0;
636 tracing = 1;
637 break;
638 default:
639 return 0;
640 }
641 return 1;
642 }
643
644 int slab_empty(struct slabinfo *s)
645 {
646 if (s->objects > 0)
647 return 0;
648
649 /*
650 * We may still have slabs even if there are no objects. Shrinking will
651 * remove them.
652 */
653 if (s->slabs != 0)
654 set_obj(s, "shrink", 1);
655
656 return 1;
657 }
658
659 void slab_debug(struct slabinfo *s)
660 {
661 if (strcmp(s->name, "*") == 0)
662 return;
663
664 if (sanity && !s->sanity_checks) {
665 set_obj(s, "sanity", 1);
666 }
667 if (!sanity && s->sanity_checks) {
668 if (slab_empty(s))
669 set_obj(s, "sanity", 0);
670 else
671 fprintf(stderr, "%s not empty cannot disable sanity checks\n", s->name);
672 }
673 if (redzone && !s->red_zone) {
674 if (slab_empty(s))
675 set_obj(s, "red_zone", 1);
676 else
677 fprintf(stderr, "%s not empty cannot enable redzoning\n", s->name);
678 }
679 if (!redzone && s->red_zone) {
680 if (slab_empty(s))
681 set_obj(s, "red_zone", 0);
682 else
683 fprintf(stderr, "%s not empty cannot disable redzoning\n", s->name);
684 }
685 if (poison && !s->poison) {
686 if (slab_empty(s))
687 set_obj(s, "poison", 1);
688 else
689 fprintf(stderr, "%s not empty cannot enable poisoning\n", s->name);
690 }
691 if (!poison && s->poison) {
692 if (slab_empty(s))
693 set_obj(s, "poison", 0);
694 else
695 fprintf(stderr, "%s not empty cannot disable poisoning\n", s->name);
696 }
697 if (tracking && !s->store_user) {
698 if (slab_empty(s))
699 set_obj(s, "store_user", 1);
700 else
701 fprintf(stderr, "%s not empty cannot enable tracking\n", s->name);
702 }
703 if (!tracking && s->store_user) {
704 if (slab_empty(s))
705 set_obj(s, "store_user", 0);
706 else
707 fprintf(stderr, "%s not empty cannot disable tracking\n", s->name);
708 }
709 if (tracing && !s->trace) {
710 if (slabs == 1)
711 set_obj(s, "trace", 1);
712 else
713 fprintf(stderr, "%s can only enable trace for one slab at a time\n", s->name);
714 }
715 if (!tracing && s->trace)
716 set_obj(s, "trace", 1);
717 }
718
719 void totals(void)
720 {
721 struct slabinfo *s;
722
723 int used_slabs = 0;
724 char b1[20], b2[20], b3[20], b4[20];
725 unsigned long long max = 1ULL << 63;
726
727 /* Object size */
728 unsigned long long min_objsize = max, max_objsize = 0, avg_objsize;
729
730 /* Number of partial slabs in a slabcache */
731 unsigned long long min_partial = max, max_partial = 0,
732 avg_partial, total_partial = 0;
733
734 /* Number of slabs in a slab cache */
735 unsigned long long min_slabs = max, max_slabs = 0,
736 avg_slabs, total_slabs = 0;
737
738 /* Size of the whole slab */
739 unsigned long long min_size = max, max_size = 0,
740 avg_size, total_size = 0;
741
742 /* Bytes used for object storage in a slab */
743 unsigned long long min_used = max, max_used = 0,
744 avg_used, total_used = 0;
745
746 /* Waste: Bytes used for alignment and padding */
747 unsigned long long min_waste = max, max_waste = 0,
748 avg_waste, total_waste = 0;
749 /* Number of objects in a slab */
750 unsigned long long min_objects = max, max_objects = 0,
751 avg_objects, total_objects = 0;
752 /* Waste per object */
753 unsigned long long min_objwaste = max,
754 max_objwaste = 0, avg_objwaste,
755 total_objwaste = 0;
756
757 /* Memory per object */
758 unsigned long long min_memobj = max,
759 max_memobj = 0, avg_memobj,
760 total_objsize = 0;
761
762 /* Percentage of partial slabs per slab */
763 unsigned long min_ppart = 100, max_ppart = 0,
764 avg_ppart, total_ppart = 0;
765
766 /* Number of objects in partial slabs */
767 unsigned long min_partobj = max, max_partobj = 0,
768 avg_partobj, total_partobj = 0;
769
770 /* Percentage of partial objects of all objects in a slab */
771 unsigned long min_ppartobj = 100, max_ppartobj = 0,
772 avg_ppartobj, total_ppartobj = 0;
773
774
775 for (s = slabinfo; s < slabinfo + slabs; s++) {
776 unsigned long long size;
777 unsigned long used;
778 unsigned long long wasted;
779 unsigned long long objwaste;
780 unsigned long percentage_partial_slabs;
781 unsigned long percentage_partial_objs;
782
783 if (!s->slabs || !s->objects)
784 continue;
785
786 used_slabs++;
787
788 size = slab_size(s);
789 used = s->objects * s->object_size;
790 wasted = size - used;
791 objwaste = s->slab_size - s->object_size;
792
793 percentage_partial_slabs = s->partial * 100 / s->slabs;
794 if (percentage_partial_slabs > 100)
795 percentage_partial_slabs = 100;
796
797 percentage_partial_objs = s->objects_partial * 100
798 / s->objects;
799
800 if (percentage_partial_objs > 100)
801 percentage_partial_objs = 100;
802
803 if (s->object_size < min_objsize)
804 min_objsize = s->object_size;
805 if (s->partial < min_partial)
806 min_partial = s->partial;
807 if (s->slabs < min_slabs)
808 min_slabs = s->slabs;
809 if (size < min_size)
810 min_size = size;
811 if (wasted < min_waste)
812 min_waste = wasted;
813 if (objwaste < min_objwaste)
814 min_objwaste = objwaste;
815 if (s->objects < min_objects)
816 min_objects = s->objects;
817 if (used < min_used)
818 min_used = used;
819 if (s->objects_partial < min_partobj)
820 min_partobj = s->objects_partial;
821 if (percentage_partial_slabs < min_ppart)
822 min_ppart = percentage_partial_slabs;
823 if (percentage_partial_objs < min_ppartobj)
824 min_ppartobj = percentage_partial_objs;
825 if (s->slab_size < min_memobj)
826 min_memobj = s->slab_size;
827
828 if (s->object_size > max_objsize)
829 max_objsize = s->object_size;
830 if (s->partial > max_partial)
831 max_partial = s->partial;
832 if (s->slabs > max_slabs)
833 max_slabs = s->slabs;
834 if (size > max_size)
835 max_size = size;
836 if (wasted > max_waste)
837 max_waste = wasted;
838 if (objwaste > max_objwaste)
839 max_objwaste = objwaste;
840 if (s->objects > max_objects)
841 max_objects = s->objects;
842 if (used > max_used)
843 max_used = used;
844 if (s->objects_partial > max_partobj)
845 max_partobj = s->objects_partial;
846 if (percentage_partial_slabs > max_ppart)
847 max_ppart = percentage_partial_slabs;
848 if (percentage_partial_objs > max_ppartobj)
849 max_ppartobj = percentage_partial_objs;
850 if (s->slab_size > max_memobj)
851 max_memobj = s->slab_size;
852
853 total_partial += s->partial;
854 total_slabs += s->slabs;
855 total_size += size;
856 total_waste += wasted;
857
858 total_objects += s->objects;
859 total_used += used;
860 total_partobj += s->objects_partial;
861 total_ppart += percentage_partial_slabs;
862 total_ppartobj += percentage_partial_objs;
863
864 total_objwaste += s->objects * objwaste;
865 total_objsize += s->objects * s->slab_size;
866 }
867
868 if (!total_objects) {
869 printf("No objects\n");
870 return;
871 }
872 if (!used_slabs) {
873 printf("No slabs\n");
874 return;
875 }
876
877 /* Per slab averages */
878 avg_partial = total_partial / used_slabs;
879 avg_slabs = total_slabs / used_slabs;
880 avg_size = total_size / used_slabs;
881 avg_waste = total_waste / used_slabs;
882
883 avg_objects = total_objects / used_slabs;
884 avg_used = total_used / used_slabs;
885 avg_partobj = total_partobj / used_slabs;
886 avg_ppart = total_ppart / used_slabs;
887 avg_ppartobj = total_ppartobj / used_slabs;
888
889 /* Per object object sizes */
890 avg_objsize = total_used / total_objects;
891 avg_objwaste = total_objwaste / total_objects;
892 avg_partobj = total_partobj * 100 / total_objects;
893 avg_memobj = total_objsize / total_objects;
894
895 printf("Slabcache Totals\n");
896 printf("----------------\n");
897 printf("Slabcaches : %3d Aliases : %3d->%-3d Active: %3d\n",
898 slabs, aliases, alias_targets, used_slabs);
899
900 store_size(b1, total_size);store_size(b2, total_waste);
901 store_size(b3, total_waste * 100 / total_used);
902 printf("Memory used: %6s # Loss : %6s MRatio:%6s%%\n", b1, b2, b3);
903
904 store_size(b1, total_objects);store_size(b2, total_partobj);
905 store_size(b3, total_partobj * 100 / total_objects);
906 printf("# Objects : %6s # PartObj: %6s ORatio:%6s%%\n", b1, b2, b3);
907
908 printf("\n");
909 printf("Per Cache Average Min Max Total\n");
910 printf("---------------------------------------------------------\n");
911
912 store_size(b1, avg_objects);store_size(b2, min_objects);
913 store_size(b3, max_objects);store_size(b4, total_objects);
914 printf("#Objects %10s %10s %10s %10s\n",
915 b1, b2, b3, b4);
916
917 store_size(b1, avg_slabs);store_size(b2, min_slabs);
918 store_size(b3, max_slabs);store_size(b4, total_slabs);
919 printf("#Slabs %10s %10s %10s %10s\n",
920 b1, b2, b3, b4);
921
922 store_size(b1, avg_partial);store_size(b2, min_partial);
923 store_size(b3, max_partial);store_size(b4, total_partial);
924 printf("#PartSlab %10s %10s %10s %10s\n",
925 b1, b2, b3, b4);
926 store_size(b1, avg_ppart);store_size(b2, min_ppart);
927 store_size(b3, max_ppart);
928 store_size(b4, total_partial * 100 / total_slabs);
929 printf("%%PartSlab%10s%% %10s%% %10s%% %10s%%\n",
930 b1, b2, b3, b4);
931
932 store_size(b1, avg_partobj);store_size(b2, min_partobj);
933 store_size(b3, max_partobj);
934 store_size(b4, total_partobj);
935 printf("PartObjs %10s %10s %10s %10s\n",
936 b1, b2, b3, b4);
937
938 store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj);
939 store_size(b3, max_ppartobj);
940 store_size(b4, total_partobj * 100 / total_objects);
941 printf("%% PartObj%10s%% %10s%% %10s%% %10s%%\n",
942 b1, b2, b3, b4);
943
944 store_size(b1, avg_size);store_size(b2, min_size);
945 store_size(b3, max_size);store_size(b4, total_size);
946 printf("Memory %10s %10s %10s %10s\n",
947 b1, b2, b3, b4);
948
949 store_size(b1, avg_used);store_size(b2, min_used);
950 store_size(b3, max_used);store_size(b4, total_used);
951 printf("Used %10s %10s %10s %10s\n",
952 b1, b2, b3, b4);
953
954 store_size(b1, avg_waste);store_size(b2, min_waste);
955 store_size(b3, max_waste);store_size(b4, total_waste);
956 printf("Loss %10s %10s %10s %10s\n",
957 b1, b2, b3, b4);
958
959 printf("\n");
960 printf("Per Object Average Min Max\n");
961 printf("---------------------------------------------\n");
962
963 store_size(b1, avg_memobj);store_size(b2, min_memobj);
964 store_size(b3, max_memobj);
965 printf("Memory %10s %10s %10s\n",
966 b1, b2, b3);
967 store_size(b1, avg_objsize);store_size(b2, min_objsize);
968 store_size(b3, max_objsize);
969 printf("User %10s %10s %10s\n",
970 b1, b2, b3);
971
972 store_size(b1, avg_objwaste);store_size(b2, min_objwaste);
973 store_size(b3, max_objwaste);
974 printf("Loss %10s %10s %10s\n",
975 b1, b2, b3);
976 }
977
978 void sort_slabs(void)
979 {
980 struct slabinfo *s1,*s2;
981
982 for (s1 = slabinfo; s1 < slabinfo + slabs; s1++) {
983 for (s2 = s1 + 1; s2 < slabinfo + slabs; s2++) {
984 int result;
985
986 if (sort_size)
987 result = slab_size(s1) < slab_size(s2);
988 else if (sort_active)
989 result = slab_activity(s1) < slab_activity(s2);
990 else
991 result = strcasecmp(s1->name, s2->name);
992
993 if (show_inverted)
994 result = -result;
995
996 if (result > 0) {
997 struct slabinfo t;
998
999 memcpy(&t, s1, sizeof(struct slabinfo));
1000 memcpy(s1, s2, sizeof(struct slabinfo));
1001 memcpy(s2, &t, sizeof(struct slabinfo));
1002 }
1003 }
1004 }
1005 }
1006
1007 void sort_aliases(void)
1008 {
1009 struct aliasinfo *a1,*a2;
1010
1011 for (a1 = aliasinfo; a1 < aliasinfo + aliases; a1++) {
1012 for (a2 = a1 + 1; a2 < aliasinfo + aliases; a2++) {
1013 char *n1, *n2;
1014
1015 n1 = a1->name;
1016 n2 = a2->name;
1017 if (show_alias && !show_inverted) {
1018 n1 = a1->ref;
1019 n2 = a2->ref;
1020 }
1021 if (strcasecmp(n1, n2) > 0) {
1022 struct aliasinfo t;
1023
1024 memcpy(&t, a1, sizeof(struct aliasinfo));
1025 memcpy(a1, a2, sizeof(struct aliasinfo));
1026 memcpy(a2, &t, sizeof(struct aliasinfo));
1027 }
1028 }
1029 }
1030 }
1031
1032 void link_slabs(void)
1033 {
1034 struct aliasinfo *a;
1035 struct slabinfo *s;
1036
1037 for (a = aliasinfo; a < aliasinfo + aliases; a++) {
1038
1039 for (s = slabinfo; s < slabinfo + slabs; s++)
1040 if (strcmp(a->ref, s->name) == 0) {
1041 a->slab = s;
1042 s->refs++;
1043 break;
1044 }
1045 if (s == slabinfo + slabs)
1046 fatal("Unresolved alias %s\n", a->ref);
1047 }
1048 }
1049
1050 void alias(void)
1051 {
1052 struct aliasinfo *a;
1053 char *active = NULL;
1054
1055 sort_aliases();
1056 link_slabs();
1057
1058 for(a = aliasinfo; a < aliasinfo + aliases; a++) {
1059
1060 if (!show_single_ref && a->slab->refs == 1)
1061 continue;
1062
1063 if (!show_inverted) {
1064 if (active) {
1065 if (strcmp(a->slab->name, active) == 0) {
1066 printf(" %s", a->name);
1067 continue;
1068 }
1069 }
1070 printf("\n%-12s <- %s", a->slab->name, a->name);
1071 active = a->slab->name;
1072 }
1073 else
1074 printf("%-20s -> %s\n", a->name, a->slab->name);
1075 }
1076 if (active)
1077 printf("\n");
1078 }
1079
1080
1081 void rename_slabs(void)
1082 {
1083 struct slabinfo *s;
1084 struct aliasinfo *a;
1085
1086 for (s = slabinfo; s < slabinfo + slabs; s++) {
1087 if (*s->name != ':')
1088 continue;
1089
1090 if (s->refs > 1 && !show_first_alias)
1091 continue;
1092
1093 a = find_one_alias(s);
1094
1095 if (a)
1096 s->name = a->name;
1097 else {
1098 s->name = "*";
1099 actual_slabs--;
1100 }
1101 }
1102 }
1103
1104 int slab_mismatch(char *slab)
1105 {
1106 return regexec(&pattern, slab, 0, NULL, 0);
1107 }
1108
1109 void read_slab_dir(void)
1110 {
1111 DIR *dir;
1112 struct dirent *de;
1113 struct slabinfo *slab = slabinfo;
1114 struct aliasinfo *alias = aliasinfo;
1115 char *p;
1116 char *t;
1117 int count;
1118
1119 if (chdir("/sys/kernel/slab") && chdir("/sys/slab"))
1120 fatal("SYSFS support for SLUB not active\n");
1121
1122 dir = opendir(".");
1123 while ((de = readdir(dir))) {
1124 if (de->d_name[0] == '.' ||
1125 (de->d_name[0] != ':' && slab_mismatch(de->d_name)))
1126 continue;
1127 switch (de->d_type) {
1128 case DT_LNK:
1129 alias->name = strdup(de->d_name);
1130 count = readlink(de->d_name, buffer, sizeof(buffer));
1131
1132 if (count < 0)
1133 fatal("Cannot read symlink %s\n", de->d_name);
1134
1135 buffer[count] = 0;
1136 p = buffer + count;
1137 while (p > buffer && p[-1] != '/')
1138 p--;
1139 alias->ref = strdup(p);
1140 alias++;
1141 break;
1142 case DT_DIR:
1143 if (chdir(de->d_name))
1144 fatal("Unable to access slab %s\n", slab->name);
1145 slab->name = strdup(de->d_name);
1146 slab->alias = 0;
1147 slab->refs = 0;
1148 slab->aliases = get_obj("aliases");
1149 slab->align = get_obj("align");
1150 slab->cache_dma = get_obj("cache_dma");
1151 slab->cpu_slabs = get_obj("cpu_slabs");
1152 slab->destroy_by_rcu = get_obj("destroy_by_rcu");
1153 slab->hwcache_align = get_obj("hwcache_align");
1154 slab->object_size = get_obj("object_size");
1155 slab->objects = get_obj("objects");
1156 slab->objects_partial = get_obj("objects_partial");
1157 slab->objects_total = get_obj("objects_total");
1158 slab->objs_per_slab = get_obj("objs_per_slab");
1159 slab->order = get_obj("order");
1160 slab->partial = get_obj("partial");
1161 slab->partial = get_obj_and_str("partial", &t);
1162 decode_numa_list(slab->numa_partial, t);
1163 free(t);
1164 slab->poison = get_obj("poison");
1165 slab->reclaim_account = get_obj("reclaim_account");
1166 slab->red_zone = get_obj("red_zone");
1167 slab->sanity_checks = get_obj("sanity_checks");
1168 slab->slab_size = get_obj("slab_size");
1169 slab->slabs = get_obj_and_str("slabs", &t);
1170 decode_numa_list(slab->numa, t);
1171 free(t);
1172 slab->store_user = get_obj("store_user");
1173 slab->trace = get_obj("trace");
1174 slab->alloc_fastpath = get_obj("alloc_fastpath");
1175 slab->alloc_slowpath = get_obj("alloc_slowpath");
1176 slab->free_fastpath = get_obj("free_fastpath");
1177 slab->free_slowpath = get_obj("free_slowpath");
1178 slab->free_frozen= get_obj("free_frozen");
1179 slab->free_add_partial = get_obj("free_add_partial");
1180 slab->free_remove_partial = get_obj("free_remove_partial");
1181 slab->alloc_from_partial = get_obj("alloc_from_partial");
1182 slab->alloc_slab = get_obj("alloc_slab");
1183 slab->alloc_refill = get_obj("alloc_refill");
1184 slab->free_slab = get_obj("free_slab");
1185 slab->cpuslab_flush = get_obj("cpuslab_flush");
1186 slab->deactivate_full = get_obj("deactivate_full");
1187 slab->deactivate_empty = get_obj("deactivate_empty");
1188 slab->deactivate_to_head = get_obj("deactivate_to_head");
1189 slab->deactivate_to_tail = get_obj("deactivate_to_tail");
1190 slab->deactivate_remote_frees = get_obj("deactivate_remote_frees");
1191 chdir("..");
1192 if (slab->name[0] == ':')
1193 alias_targets++;
1194 slab++;
1195 break;
1196 default :
1197 fatal("Unknown file type %lx\n", de->d_type);
1198 }
1199 }
1200 closedir(dir);
1201 slabs = slab - slabinfo;
1202 actual_slabs = slabs;
1203 aliases = alias - aliasinfo;
1204 if (slabs > MAX_SLABS)
1205 fatal("Too many slabs\n");
1206 if (aliases > MAX_ALIASES)
1207 fatal("Too many aliases\n");
1208 }
1209
1210 void output_slabs(void)
1211 {
1212 struct slabinfo *slab;
1213
1214 for (slab = slabinfo; slab < slabinfo + slabs; slab++) {
1215
1216 if (slab->alias)
1217 continue;
1218
1219
1220 if (show_numa)
1221 slab_numa(slab, 0);
1222 else if (show_track)
1223 show_tracking(slab);
1224 else if (validate)
1225 slab_validate(slab);
1226 else if (shrink)
1227 slab_shrink(slab);
1228 else if (set_debug)
1229 slab_debug(slab);
1230 else if (show_ops)
1231 ops(slab);
1232 else if (show_slab)
1233 slabcache(slab);
1234 else if (show_report)
1235 report(slab);
1236 }
1237 }
1238
1239 struct option opts[] = {
1240 { "aliases", 0, NULL, 'a' },
1241 { "activity", 0, NULL, 'A' },
1242 { "debug", 2, NULL, 'd' },
1243 { "display-activity", 0, NULL, 'D' },
1244 { "empty", 0, NULL, 'e' },
1245 { "first-alias", 0, NULL, 'f' },
1246 { "help", 0, NULL, 'h' },
1247 { "inverted", 0, NULL, 'i'},
1248 { "numa", 0, NULL, 'n' },
1249 { "ops", 0, NULL, 'o' },
1250 { "report", 0, NULL, 'r' },
1251 { "shrink", 0, NULL, 's' },
1252 { "slabs", 0, NULL, 'l' },
1253 { "track", 0, NULL, 't'},
1254 { "validate", 0, NULL, 'v' },
1255 { "zero", 0, NULL, 'z' },
1256 { "1ref", 0, NULL, '1'},
1257 { NULL, 0, NULL, 0 }
1258 };
1259
1260 int main(int argc, char *argv[])
1261 {
1262 int c;
1263 int err;
1264 char *pattern_source;
1265
1266 page_size = getpagesize();
1267
1268 while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTS",
1269 opts, NULL)) != -1)
1270 switch (c) {
1271 case '1':
1272 show_single_ref = 1;
1273 break;
1274 case 'a':
1275 show_alias = 1;
1276 break;
1277 case 'A':
1278 sort_active = 1;
1279 break;
1280 case 'd':
1281 set_debug = 1;
1282 if (!debug_opt_scan(optarg))
1283 fatal("Invalid debug option '%s'\n", optarg);
1284 break;
1285 case 'D':
1286 show_activity = 1;
1287 break;
1288 case 'e':
1289 show_empty = 1;
1290 break;
1291 case 'f':
1292 show_first_alias = 1;
1293 break;
1294 case 'h':
1295 usage();
1296 return 0;
1297 case 'i':
1298 show_inverted = 1;
1299 break;
1300 case 'n':
1301 show_numa = 1;
1302 break;
1303 case 'o':
1304 show_ops = 1;
1305 break;
1306 case 'r':
1307 show_report = 1;
1308 break;
1309 case 's':
1310 shrink = 1;
1311 break;
1312 case 'l':
1313 show_slab = 1;
1314 break;
1315 case 't':
1316 show_track = 1;
1317 break;
1318 case 'v':
1319 validate = 1;
1320 break;
1321 case 'z':
1322 skip_zero = 0;
1323 break;
1324 case 'T':
1325 show_totals = 1;
1326 break;
1327 case 'S':
1328 sort_size = 1;
1329 break;
1330
1331 default:
1332 fatal("%s: Invalid option '%c'\n", argv[0], optopt);
1333
1334 }
1335
1336 if (!show_slab && !show_alias && !show_track && !show_report
1337 && !validate && !shrink && !set_debug && !show_ops)
1338 show_slab = 1;
1339
1340 if (argc > optind)
1341 pattern_source = argv[optind];
1342 else
1343 pattern_source = ".*";
1344
1345 err = regcomp(&pattern, pattern_source, REG_ICASE|REG_NOSUB);
1346 if (err)
1347 fatal("%s: Invalid pattern '%s' code %d\n",
1348 argv[0], pattern_source, err);
1349 read_slab_dir();
1350 if (show_alias)
1351 alias();
1352 else
1353 if (show_totals)
1354 totals();
1355 else {
1356 link_slabs();
1357 rename_slabs();
1358 sort_slabs();
1359 output_slabs();
1360 }
1361 return 0;
1362 }
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