Root/tools/vm/slabinfo.c

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 = 0;
57int actual_slabs = 0;
58int aliases = 0;
59int alias_targets = 0;
60int highest_node = 0;
61
62char buffer[4096];
63
64int show_empty = 0;
65int show_report = 0;
66int show_alias = 0;
67int show_slab = 0;
68int skip_zero = 1;
69int show_numa = 0;
70int show_track = 0;
71int show_first_alias = 0;
72int validate = 0;
73int shrink = 0;
74int show_inverted = 0;
75int show_single_ref = 0;
76int show_totals = 0;
77int sort_size = 0;
78int sort_active = 0;
79int set_debug = 0;
80int show_ops = 0;
81int show_activity = 0;
82
83/* Debug options */
84int sanity = 0;
85int redzone = 0;
86int poison = 0;
87int tracking = 0;
88int tracing = 0;
89
90int page_size;
91
92regex_t pattern;
93
94static void fatal(const char *x, ...)
95{
96    va_list ap;
97
98    va_start(ap, x);
99    vfprintf(stderr, x, ap);
100    va_end(ap);
101    exit(EXIT_FAILURE);
102}
103
104static void usage(void)
105{
106    printf("slabinfo 4/15/2011. (c) 2007 sgi/(c) 2011 Linux Foundation.\n\n"
107        "slabinfo [-ahnpvtsz] [-d debugopts] [slab-regexp]\n"
108        "-a|--aliases Show aliases\n"
109        "-A|--activity Most active slabs first\n"
110        "-d<options>|--debug=<options> Set/Clear Debug options\n"
111        "-D|--display-active Switch line format to activity\n"
112        "-e|--empty Show empty slabs\n"
113        "-f|--first-alias Show first alias\n"
114        "-h|--help Show usage information\n"
115        "-i|--inverted Inverted list\n"
116        "-l|--slabs Show slabs\n"
117        "-n|--numa Show NUMA information\n"
118        "-o|--ops Show kmem_cache_ops\n"
119        "-s|--shrink Shrink slabs\n"
120        "-r|--report Detailed report on single slabs\n"
121        "-S|--Size Sort by size\n"
122        "-t|--tracking Show alloc/free information\n"
123        "-T|--Totals Show summary information\n"
124        "-v|--validate Validate slabs\n"
125        "-z|--zero Include empty slabs\n"
126        "-1|--1ref Single reference\n"
127        "\nValid debug options (FZPUT may be combined)\n"
128        "a / A Switch on all debug options (=FZUP)\n"
129        "- Switch off all debug options\n"
130        "f / F Sanity Checks (SLAB_DEBUG_FREE)\n"
131        "z / Z Redzoning\n"
132        "p / P Poisoning\n"
133        "u / U Tracking\n"
134        "t / T Tracing\n"
135    );
136}
137
138static unsigned long read_obj(const char *name)
139{
140    FILE *f = fopen(name, "r");
141
142    if (!f)
143        buffer[0] = 0;
144    else {
145        if (!fgets(buffer, sizeof(buffer), f))
146            buffer[0] = 0;
147        fclose(f);
148        if (buffer[strlen(buffer)] == '\n')
149            buffer[strlen(buffer)] = 0;
150    }
151    return strlen(buffer);
152}
153
154
155/*
156 * Get the contents of an attribute
157 */
158static unsigned long get_obj(const char *name)
159{
160    if (!read_obj(name))
161        return 0;
162
163    return atol(buffer);
164}
165
166static unsigned long get_obj_and_str(const char *name, char **x)
167{
168    unsigned long result = 0;
169    char *p;
170
171    *x = NULL;
172
173    if (!read_obj(name)) {
174        x = NULL;
175        return 0;
176    }
177    result = strtoul(buffer, &p, 10);
178    while (*p == ' ')
179        p++;
180    if (*p)
181        *x = strdup(p);
182    return result;
183}
184
185static void set_obj(struct slabinfo *s, const char *name, int n)
186{
187    char x[100];
188    FILE *f;
189
190    snprintf(x, 100, "%s/%s", s->name, name);
191    f = fopen(x, "w");
192    if (!f)
193        fatal("Cannot write to %s\n", x);
194
195    fprintf(f, "%d\n", n);
196    fclose(f);
197}
198
199static unsigned long read_slab_obj(struct slabinfo *s, const char *name)
200{
201    char x[100];
202    FILE *f;
203    size_t l;
204
205    snprintf(x, 100, "%s/%s", s->name, name);
206    f = fopen(x, "r");
207    if (!f) {
208        buffer[0] = 0;
209        l = 0;
210    } else {
211        l = fread(buffer, 1, sizeof(buffer), f);
212        buffer[l] = 0;
213        fclose(f);
214    }
215    return l;
216}
217
218
219/*
220 * Put a size string together
221 */
222static int store_size(char *buffer, unsigned long value)
223{
224    unsigned long divisor = 1;
225    char trailer = 0;
226    int n;
227
228    if (value > 1000000000UL) {
229        divisor = 100000000UL;
230        trailer = 'G';
231    } else if (value > 1000000UL) {
232        divisor = 100000UL;
233        trailer = 'M';
234    } else if (value > 1000UL) {
235        divisor = 100;
236        trailer = 'K';
237    }
238
239    value /= divisor;
240    n = sprintf(buffer, "%ld",value);
241    if (trailer) {
242        buffer[n] = trailer;
243        n++;
244        buffer[n] = 0;
245    }
246    if (divisor != 1) {
247        memmove(buffer + n - 2, buffer + n - 3, 4);
248        buffer[n-2] = '.';
249        n++;
250    }
251    return n;
252}
253
254static void decode_numa_list(int *numa, char *t)
255{
256    int node;
257    int nr;
258
259    memset(numa, 0, MAX_NODES * sizeof(int));
260
261    if (!t)
262        return;
263
264    while (*t == 'N') {
265        t++;
266        node = strtoul(t, &t, 10);
267        if (*t == '=') {
268            t++;
269            nr = strtoul(t, &t, 10);
270            numa[node] = nr;
271            if (node > highest_node)
272                highest_node = node;
273        }
274        while (*t == ' ')
275            t++;
276    }
277}
278
279static void slab_validate(struct slabinfo *s)
280{
281    if (strcmp(s->name, "*") == 0)
282        return;
283
284    set_obj(s, "validate", 1);
285}
286
287static void slab_shrink(struct slabinfo *s)
288{
289    if (strcmp(s->name, "*") == 0)
290        return;
291
292    set_obj(s, "shrink", 1);
293}
294
295int line = 0;
296
297static void first_line(void)
298{
299    if (show_activity)
300        printf("Name Objects Alloc Free %%Fast Fallb O CmpX UL\n");
301    else
302        printf("Name Objects Objsize Space "
303            "Slabs/Part/Cpu O/S O %%Fr %%Ef Flg\n");
304}
305
306/*
307 * Find the shortest alias of a slab
308 */
309static struct aliasinfo *find_one_alias(struct slabinfo *find)
310{
311    struct aliasinfo *a;
312    struct aliasinfo *best = NULL;
313
314    for(a = aliasinfo;a < aliasinfo + aliases; a++) {
315        if (a->slab == find &&
316            (!best || strlen(best->name) < strlen(a->name))) {
317                best = a;
318                if (strncmp(a->name,"kmall", 5) == 0)
319                    return best;
320            }
321    }
322    return best;
323}
324
325static unsigned long slab_size(struct slabinfo *s)
326{
327    return s->slabs * (page_size << s->order);
328}
329
330static unsigned long slab_activity(struct slabinfo *s)
331{
332    return s->alloc_fastpath + s->free_fastpath +
333        s->alloc_slowpath + s->free_slowpath;
334}
335
336static void slab_numa(struct slabinfo *s, int mode)
337{
338    int node;
339
340    if (strcmp(s->name, "*") == 0)
341        return;
342
343    if (!highest_node) {
344        printf("\n%s: No NUMA information available.\n", s->name);
345        return;
346    }
347
348    if (skip_zero && !s->slabs)
349        return;
350
351    if (!line) {
352        printf("\n%-21s:", mode ? "NUMA nodes" : "Slab");
353        for(node = 0; node <= highest_node; node++)
354            printf(" %4d", node);
355        printf("\n----------------------");
356        for(node = 0; node <= highest_node; node++)
357            printf("-----");
358        printf("\n");
359    }
360    printf("%-21s ", mode ? "All slabs" : s->name);
361    for(node = 0; node <= highest_node; node++) {
362        char b[20];
363
364        store_size(b, s->numa[node]);
365        printf(" %4s", b);
366    }
367    printf("\n");
368    if (mode) {
369        printf("%-21s ", "Partial slabs");
370        for(node = 0; node <= highest_node; node++) {
371            char b[20];
372
373            store_size(b, s->numa_partial[node]);
374            printf(" %4s", b);
375        }
376        printf("\n");
377    }
378    line++;
379}
380
381static void show_tracking(struct slabinfo *s)
382{
383    printf("\n%s: Kernel object allocation\n", s->name);
384    printf("-----------------------------------------------------------------------\n");
385    if (read_slab_obj(s, "alloc_calls"))
386        printf("%s", buffer);
387    else
388        printf("No Data\n");
389
390    printf("\n%s: Kernel object freeing\n", s->name);
391    printf("------------------------------------------------------------------------\n");
392    if (read_slab_obj(s, "free_calls"))
393        printf("%s", buffer);
394    else
395        printf("No Data\n");
396
397}
398
399static void ops(struct slabinfo *s)
400{
401    if (strcmp(s->name, "*") == 0)
402        return;
403
404    if (read_slab_obj(s, "ops")) {
405        printf("\n%s: kmem_cache operations\n", s->name);
406        printf("--------------------------------------------\n");
407        printf("%s", buffer);
408    } else
409        printf("\n%s has no kmem_cache operations\n", s->name);
410}
411
412static const char *onoff(int x)
413{
414    if (x)
415        return "On ";
416    return "Off";
417}
418
419static void slab_stats(struct slabinfo *s)
420{
421    unsigned long total_alloc;
422    unsigned long total_free;
423    unsigned long total;
424
425    if (!s->alloc_slab)
426        return;
427
428    total_alloc = s->alloc_fastpath + s->alloc_slowpath;
429    total_free = s->free_fastpath + s->free_slowpath;
430
431    if (!total_alloc)
432        return;
433
434    printf("\n");
435    printf("Slab Perf Counter Alloc Free %%Al %%Fr\n");
436    printf("--------------------------------------------------\n");
437    printf("Fastpath %8lu %8lu %3lu %3lu\n",
438        s->alloc_fastpath, s->free_fastpath,
439        s->alloc_fastpath * 100 / total_alloc,
440        s->free_fastpath * 100 / total_free);
441    printf("Slowpath %8lu %8lu %3lu %3lu\n",
442        total_alloc - s->alloc_fastpath, s->free_slowpath,
443        (total_alloc - s->alloc_fastpath) * 100 / total_alloc,
444        s->free_slowpath * 100 / total_free);
445    printf("Page Alloc %8lu %8lu %3lu %3lu\n",
446        s->alloc_slab, s->free_slab,
447        s->alloc_slab * 100 / total_alloc,
448        s->free_slab * 100 / total_free);
449    printf("Add partial %8lu %8lu %3lu %3lu\n",
450        s->deactivate_to_head + s->deactivate_to_tail,
451        s->free_add_partial,
452        (s->deactivate_to_head + s->deactivate_to_tail) * 100 / total_alloc,
453        s->free_add_partial * 100 / total_free);
454    printf("Remove partial %8lu %8lu %3lu %3lu\n",
455        s->alloc_from_partial, s->free_remove_partial,
456        s->alloc_from_partial * 100 / total_alloc,
457        s->free_remove_partial * 100 / total_free);
458
459    printf("Cpu partial list %8lu %8lu %3lu %3lu\n",
460        s->cpu_partial_alloc, s->cpu_partial_free,
461        s->cpu_partial_alloc * 100 / total_alloc,
462        s->cpu_partial_free * 100 / total_free);
463
464    printf("RemoteObj/SlabFrozen %8lu %8lu %3lu %3lu\n",
465        s->deactivate_remote_frees, s->free_frozen,
466        s->deactivate_remote_frees * 100 / total_alloc,
467        s->free_frozen * 100 / total_free);
468
469    printf("Total %8lu %8lu\n\n", total_alloc, total_free);
470
471    if (s->cpuslab_flush)
472        printf("Flushes %8lu\n", s->cpuslab_flush);
473
474    total = s->deactivate_full + s->deactivate_empty +
475            s->deactivate_to_head + s->deactivate_to_tail + s->deactivate_bypass;
476
477    if (total) {
478        printf("\nSlab Deactivation Ocurrences %%\n");
479        printf("-------------------------------------------------\n");
480        printf("Slab full %7lu %3lu%%\n",
481            s->deactivate_full, (s->deactivate_full * 100) / total);
482        printf("Slab empty %7lu %3lu%%\n",
483            s->deactivate_empty, (s->deactivate_empty * 100) / total);
484        printf("Moved to head of partial list %7lu %3lu%%\n",
485            s->deactivate_to_head, (s->deactivate_to_head * 100) / total);
486        printf("Moved to tail of partial list %7lu %3lu%%\n",
487            s->deactivate_to_tail, (s->deactivate_to_tail * 100) / total);
488        printf("Deactivation bypass %7lu %3lu%%\n",
489            s->deactivate_bypass, (s->deactivate_bypass * 100) / total);
490        printf("Refilled from foreign frees %7lu %3lu%%\n",
491            s->alloc_refill, (s->alloc_refill * 100) / total);
492        printf("Node mismatch %7lu %3lu%%\n",
493            s->alloc_node_mismatch, (s->alloc_node_mismatch * 100) / total);
494    }
495
496    if (s->cmpxchg_double_fail || s->cmpxchg_double_cpu_fail)
497        printf("\nCmpxchg_double Looping\n------------------------\n");
498        printf("Locked Cmpxchg Double redos %lu\nUnlocked Cmpxchg Double redos %lu\n",
499            s->cmpxchg_double_fail, s->cmpxchg_double_cpu_fail);
500}
501
502static void report(struct slabinfo *s)
503{
504    if (strcmp(s->name, "*") == 0)
505        return;
506
507    printf("\nSlabcache: %-20s Aliases: %2d Order : %2d Objects: %lu\n",
508        s->name, s->aliases, s->order, s->objects);
509    if (s->hwcache_align)
510        printf("** Hardware cacheline aligned\n");
511    if (s->cache_dma)
512        printf("** Memory is allocated in a special DMA zone\n");
513    if (s->destroy_by_rcu)
514        printf("** Slabs are destroyed via RCU\n");
515    if (s->reclaim_account)
516        printf("** Reclaim accounting active\n");
517
518    printf("\nSizes (bytes) Slabs Debug Memory\n");
519    printf("------------------------------------------------------------------------\n");
520    printf("Object : %7d Total : %7ld Sanity Checks : %s Total: %7ld\n",
521            s->object_size, s->slabs, onoff(s->sanity_checks),
522            s->slabs * (page_size << s->order));
523    printf("SlabObj: %7d Full : %7ld Redzoning : %s Used : %7ld\n",
524            s->slab_size, s->slabs - s->partial - s->cpu_slabs,
525            onoff(s->red_zone), s->objects * s->object_size);
526    printf("SlabSiz: %7d Partial: %7ld Poisoning : %s Loss : %7ld\n",
527            page_size << s->order, s->partial, onoff(s->poison),
528            s->slabs * (page_size << s->order) - s->objects * s->object_size);
529    printf("Loss : %7d CpuSlab: %7d Tracking : %s Lalig: %7ld\n",
530            s->slab_size - s->object_size, s->cpu_slabs, onoff(s->store_user),
531            (s->slab_size - s->object_size) * s->objects);
532    printf("Align : %7d Objects: %7d Tracing : %s Lpadd: %7ld\n",
533            s->align, s->objs_per_slab, onoff(s->trace),
534            ((page_size << s->order) - s->objs_per_slab * s->slab_size) *
535            s->slabs);
536
537    ops(s);
538    show_tracking(s);
539    slab_numa(s, 1);
540    slab_stats(s);
541}
542
543static void slabcache(struct slabinfo *s)
544{
545    char size_str[20];
546    char dist_str[40];
547    char flags[20];
548    char *p = flags;
549
550    if (strcmp(s->name, "*") == 0)
551        return;
552
553    if (actual_slabs == 1) {
554        report(s);
555        return;
556    }
557
558    if (skip_zero && !show_empty && !s->slabs)
559        return;
560
561    if (show_empty && s->slabs)
562        return;
563
564    store_size(size_str, slab_size(s));
565    snprintf(dist_str, 40, "%lu/%lu/%d", s->slabs - s->cpu_slabs,
566                        s->partial, s->cpu_slabs);
567
568    if (!line++)
569        first_line();
570
571    if (s->aliases)
572        *p++ = '*';
573    if (s->cache_dma)
574        *p++ = 'd';
575    if (s->hwcache_align)
576        *p++ = 'A';
577    if (s->poison)
578        *p++ = 'P';
579    if (s->reclaim_account)
580        *p++ = 'a';
581    if (s->red_zone)
582        *p++ = 'Z';
583    if (s->sanity_checks)
584        *p++ = 'F';
585    if (s->store_user)
586        *p++ = 'U';
587    if (s->trace)
588        *p++ = 'T';
589
590    *p = 0;
591    if (show_activity) {
592        unsigned long total_alloc;
593        unsigned long total_free;
594
595        total_alloc = s->alloc_fastpath + s->alloc_slowpath;
596        total_free = s->free_fastpath + s->free_slowpath;
597
598        printf("%-21s %8ld %10ld %10ld %3ld %3ld %5ld %1d %4ld %4ld\n",
599            s->name, s->objects,
600            total_alloc, total_free,
601            total_alloc ? (s->alloc_fastpath * 100 / total_alloc) : 0,
602            total_free ? (s->free_fastpath * 100 / total_free) : 0,
603            s->order_fallback, s->order, s->cmpxchg_double_fail,
604            s->cmpxchg_double_cpu_fail);
605    }
606    else
607        printf("%-21s %8ld %7d %8s %14s %4d %1d %3ld %3ld %s\n",
608            s->name, s->objects, s->object_size, size_str, dist_str,
609            s->objs_per_slab, s->order,
610            s->slabs ? (s->partial * 100) / s->slabs : 100,
611            s->slabs ? (s->objects * s->object_size * 100) /
612                (s->slabs * (page_size << s->order)) : 100,
613            flags);
614}
615
616/*
617 * Analyze debug options. Return false if something is amiss.
618 */
619static int debug_opt_scan(char *opt)
620{
621    if (!opt || !opt[0] || strcmp(opt, "-") == 0)
622        return 1;
623
624    if (strcasecmp(opt, "a") == 0) {
625        sanity = 1;
626        poison = 1;
627        redzone = 1;
628        tracking = 1;
629        return 1;
630    }
631
632    for ( ; *opt; opt++)
633        switch (*opt) {
634        case 'F' : case 'f':
635            if (sanity)
636                return 0;
637            sanity = 1;
638            break;
639        case 'P' : case 'p':
640            if (poison)
641                return 0;
642            poison = 1;
643            break;
644
645        case 'Z' : case 'z':
646            if (redzone)
647                return 0;
648            redzone = 1;
649            break;
650
651        case 'U' : case 'u':
652            if (tracking)
653                return 0;
654            tracking = 1;
655            break;
656
657        case 'T' : case 't':
658            if (tracing)
659                return 0;
660            tracing = 1;
661            break;
662        default:
663            return 0;
664        }
665    return 1;
666}
667
668static int slab_empty(struct slabinfo *s)
669{
670    if (s->objects > 0)
671        return 0;
672
673    /*
674     * We may still have slabs even if there are no objects. Shrinking will
675     * remove them.
676     */
677    if (s->slabs != 0)
678        set_obj(s, "shrink", 1);
679
680    return 1;
681}
682
683static void slab_debug(struct slabinfo *s)
684{
685    if (strcmp(s->name, "*") == 0)
686        return;
687
688    if (sanity && !s->sanity_checks) {
689        set_obj(s, "sanity", 1);
690    }
691    if (!sanity && s->sanity_checks) {
692        if (slab_empty(s))
693            set_obj(s, "sanity", 0);
694        else
695            fprintf(stderr, "%s not empty cannot disable sanity checks\n", s->name);
696    }
697    if (redzone && !s->red_zone) {
698        if (slab_empty(s))
699            set_obj(s, "red_zone", 1);
700        else
701            fprintf(stderr, "%s not empty cannot enable redzoning\n", s->name);
702    }
703    if (!redzone && s->red_zone) {
704        if (slab_empty(s))
705            set_obj(s, "red_zone", 0);
706        else
707            fprintf(stderr, "%s not empty cannot disable redzoning\n", s->name);
708    }
709    if (poison && !s->poison) {
710        if (slab_empty(s))
711            set_obj(s, "poison", 1);
712        else
713            fprintf(stderr, "%s not empty cannot enable poisoning\n", s->name);
714    }
715    if (!poison && s->poison) {
716        if (slab_empty(s))
717            set_obj(s, "poison", 0);
718        else
719            fprintf(stderr, "%s not empty cannot disable poisoning\n", s->name);
720    }
721    if (tracking && !s->store_user) {
722        if (slab_empty(s))
723            set_obj(s, "store_user", 1);
724        else
725            fprintf(stderr, "%s not empty cannot enable tracking\n", s->name);
726    }
727    if (!tracking && s->store_user) {
728        if (slab_empty(s))
729            set_obj(s, "store_user", 0);
730        else
731            fprintf(stderr, "%s not empty cannot disable tracking\n", s->name);
732    }
733    if (tracing && !s->trace) {
734        if (slabs == 1)
735            set_obj(s, "trace", 1);
736        else
737            fprintf(stderr, "%s can only enable trace for one slab at a time\n", s->name);
738    }
739    if (!tracing && s->trace)
740        set_obj(s, "trace", 1);
741}
742
743static void totals(void)
744{
745    struct slabinfo *s;
746
747    int used_slabs = 0;
748    char b1[20], b2[20], b3[20], b4[20];
749    unsigned long long max = 1ULL << 63;
750
751    /* Object size */
752    unsigned long long min_objsize = max, max_objsize = 0, avg_objsize;
753
754    /* Number of partial slabs in a slabcache */
755    unsigned long long min_partial = max, max_partial = 0,
756                avg_partial, total_partial = 0;
757
758    /* Number of slabs in a slab cache */
759    unsigned long long min_slabs = max, max_slabs = 0,
760                avg_slabs, total_slabs = 0;
761
762    /* Size of the whole slab */
763    unsigned long long min_size = max, max_size = 0,
764                avg_size, total_size = 0;
765
766    /* Bytes used for object storage in a slab */
767    unsigned long long min_used = max, max_used = 0,
768                avg_used, total_used = 0;
769
770    /* Waste: Bytes used for alignment and padding */
771    unsigned long long min_waste = max, max_waste = 0,
772                avg_waste, total_waste = 0;
773    /* Number of objects in a slab */
774    unsigned long long min_objects = max, max_objects = 0,
775                avg_objects, total_objects = 0;
776    /* Waste per object */
777    unsigned long long min_objwaste = max,
778                max_objwaste = 0, avg_objwaste,
779                total_objwaste = 0;
780
781    /* Memory per object */
782    unsigned long long min_memobj = max,
783                max_memobj = 0, avg_memobj,
784                total_objsize = 0;
785
786    /* Percentage of partial slabs per slab */
787    unsigned long min_ppart = 100, max_ppart = 0,
788                avg_ppart, total_ppart = 0;
789
790    /* Number of objects in partial slabs */
791    unsigned long min_partobj = max, max_partobj = 0,
792                avg_partobj, total_partobj = 0;
793
794    /* Percentage of partial objects of all objects in a slab */
795    unsigned long min_ppartobj = 100, max_ppartobj = 0,
796                avg_ppartobj, total_ppartobj = 0;
797
798
799    for (s = slabinfo; s < slabinfo + slabs; s++) {
800        unsigned long long size;
801        unsigned long used;
802        unsigned long long wasted;
803        unsigned long long objwaste;
804        unsigned long percentage_partial_slabs;
805        unsigned long percentage_partial_objs;
806
807        if (!s->slabs || !s->objects)
808            continue;
809
810        used_slabs++;
811
812        size = slab_size(s);
813        used = s->objects * s->object_size;
814        wasted = size - used;
815        objwaste = s->slab_size - s->object_size;
816
817        percentage_partial_slabs = s->partial * 100 / s->slabs;
818        if (percentage_partial_slabs > 100)
819            percentage_partial_slabs = 100;
820
821        percentage_partial_objs = s->objects_partial * 100
822                            / s->objects;
823
824        if (percentage_partial_objs > 100)
825            percentage_partial_objs = 100;
826
827        if (s->object_size < min_objsize)
828            min_objsize = s->object_size;
829        if (s->partial < min_partial)
830            min_partial = s->partial;
831        if (s->slabs < min_slabs)
832            min_slabs = s->slabs;
833        if (size < min_size)
834            min_size = size;
835        if (wasted < min_waste)
836            min_waste = wasted;
837        if (objwaste < min_objwaste)
838            min_objwaste = objwaste;
839        if (s->objects < min_objects)
840            min_objects = s->objects;
841        if (used < min_used)
842            min_used = used;
843        if (s->objects_partial < min_partobj)
844            min_partobj = s->objects_partial;
845        if (percentage_partial_slabs < min_ppart)
846            min_ppart = percentage_partial_slabs;
847        if (percentage_partial_objs < min_ppartobj)
848            min_ppartobj = percentage_partial_objs;
849        if (s->slab_size < min_memobj)
850            min_memobj = s->slab_size;
851
852        if (s->object_size > max_objsize)
853            max_objsize = s->object_size;
854        if (s->partial > max_partial)
855            max_partial = s->partial;
856        if (s->slabs > max_slabs)
857            max_slabs = s->slabs;
858        if (size > max_size)
859            max_size = size;
860        if (wasted > max_waste)
861            max_waste = wasted;
862        if (objwaste > max_objwaste)
863            max_objwaste = objwaste;
864        if (s->objects > max_objects)
865            max_objects = s->objects;
866        if (used > max_used)
867            max_used = used;
868        if (s->objects_partial > max_partobj)
869            max_partobj = s->objects_partial;
870        if (percentage_partial_slabs > max_ppart)
871            max_ppart = percentage_partial_slabs;
872        if (percentage_partial_objs > max_ppartobj)
873            max_ppartobj = percentage_partial_objs;
874        if (s->slab_size > max_memobj)
875            max_memobj = s->slab_size;
876
877        total_partial += s->partial;
878        total_slabs += s->slabs;
879        total_size += size;
880        total_waste += wasted;
881
882        total_objects += s->objects;
883        total_used += used;
884        total_partobj += s->objects_partial;
885        total_ppart += percentage_partial_slabs;
886        total_ppartobj += percentage_partial_objs;
887
888        total_objwaste += s->objects * objwaste;
889        total_objsize += s->objects * s->slab_size;
890    }
891
892    if (!total_objects) {
893        printf("No objects\n");
894        return;
895    }
896    if (!used_slabs) {
897        printf("No slabs\n");
898        return;
899    }
900
901    /* Per slab averages */
902    avg_partial = total_partial / used_slabs;
903    avg_slabs = total_slabs / used_slabs;
904    avg_size = total_size / used_slabs;
905    avg_waste = total_waste / used_slabs;
906
907    avg_objects = total_objects / used_slabs;
908    avg_used = total_used / used_slabs;
909    avg_partobj = total_partobj / used_slabs;
910    avg_ppart = total_ppart / used_slabs;
911    avg_ppartobj = total_ppartobj / used_slabs;
912
913    /* Per object object sizes */
914    avg_objsize = total_used / total_objects;
915    avg_objwaste = total_objwaste / total_objects;
916    avg_partobj = total_partobj * 100 / total_objects;
917    avg_memobj = total_objsize / total_objects;
918
919    printf("Slabcache Totals\n");
920    printf("----------------\n");
921    printf("Slabcaches : %3d Aliases : %3d->%-3d Active: %3d\n",
922            slabs, aliases, alias_targets, used_slabs);
923
924    store_size(b1, total_size);store_size(b2, total_waste);
925    store_size(b3, total_waste * 100 / total_used);
926    printf("Memory used: %6s # Loss : %6s MRatio:%6s%%\n", b1, b2, b3);
927
928    store_size(b1, total_objects);store_size(b2, total_partobj);
929    store_size(b3, total_partobj * 100 / total_objects);
930    printf("# Objects : %6s # PartObj: %6s ORatio:%6s%%\n", b1, b2, b3);
931
932    printf("\n");
933    printf("Per Cache Average Min Max Total\n");
934    printf("---------------------------------------------------------\n");
935
936    store_size(b1, avg_objects);store_size(b2, min_objects);
937    store_size(b3, max_objects);store_size(b4, total_objects);
938    printf("#Objects %10s %10s %10s %10s\n",
939            b1, b2, b3, b4);
940
941    store_size(b1, avg_slabs);store_size(b2, min_slabs);
942    store_size(b3, max_slabs);store_size(b4, total_slabs);
943    printf("#Slabs %10s %10s %10s %10s\n",
944            b1, b2, b3, b4);
945
946    store_size(b1, avg_partial);store_size(b2, min_partial);
947    store_size(b3, max_partial);store_size(b4, total_partial);
948    printf("#PartSlab %10s %10s %10s %10s\n",
949            b1, b2, b3, b4);
950    store_size(b1, avg_ppart);store_size(b2, min_ppart);
951    store_size(b3, max_ppart);
952    store_size(b4, total_partial * 100 / total_slabs);
953    printf("%%PartSlab%10s%% %10s%% %10s%% %10s%%\n",
954            b1, b2, b3, b4);
955
956    store_size(b1, avg_partobj);store_size(b2, min_partobj);
957    store_size(b3, max_partobj);
958    store_size(b4, total_partobj);
959    printf("PartObjs %10s %10s %10s %10s\n",
960            b1, b2, b3, b4);
961
962    store_size(b1, avg_ppartobj);store_size(b2, min_ppartobj);
963    store_size(b3, max_ppartobj);
964    store_size(b4, total_partobj * 100 / total_objects);
965    printf("%% PartObj%10s%% %10s%% %10s%% %10s%%\n",
966            b1, b2, b3, b4);
967
968    store_size(b1, avg_size);store_size(b2, min_size);
969    store_size(b3, max_size);store_size(b4, total_size);
970    printf("Memory %10s %10s %10s %10s\n",
971            b1, b2, b3, b4);
972
973    store_size(b1, avg_used);store_size(b2, min_used);
974    store_size(b3, max_used);store_size(b4, total_used);
975    printf("Used %10s %10s %10s %10s\n",
976            b1, b2, b3, b4);
977
978    store_size(b1, avg_waste);store_size(b2, min_waste);
979    store_size(b3, max_waste);store_size(b4, total_waste);
980    printf("Loss %10s %10s %10s %10s\n",
981            b1, b2, b3, b4);
982
983    printf("\n");
984    printf("Per Object Average Min Max\n");
985    printf("---------------------------------------------\n");
986
987    store_size(b1, avg_memobj);store_size(b2, min_memobj);
988    store_size(b3, max_memobj);
989    printf("Memory %10s %10s %10s\n",
990            b1, b2, b3);
991    store_size(b1, avg_objsize);store_size(b2, min_objsize);
992    store_size(b3, max_objsize);
993    printf("User %10s %10s %10s\n",
994            b1, b2, b3);
995
996    store_size(b1, avg_objwaste);store_size(b2, min_objwaste);
997    store_size(b3, max_objwaste);
998    printf("Loss %10s %10s %10s\n",
999            b1, b2, b3);
1000}
1001
1002static void sort_slabs(void)
1003{
1004    struct slabinfo *s1,*s2;
1005
1006    for (s1 = slabinfo; s1 < slabinfo + slabs; s1++) {
1007        for (s2 = s1 + 1; s2 < slabinfo + slabs; s2++) {
1008            int result;
1009
1010            if (sort_size)
1011                result = slab_size(s1) < slab_size(s2);
1012            else if (sort_active)
1013                result = slab_activity(s1) < slab_activity(s2);
1014            else
1015                result = strcasecmp(s1->name, s2->name);
1016
1017            if (show_inverted)
1018                result = -result;
1019
1020            if (result > 0) {
1021                struct slabinfo t;
1022
1023                memcpy(&t, s1, sizeof(struct slabinfo));
1024                memcpy(s1, s2, sizeof(struct slabinfo));
1025                memcpy(s2, &t, sizeof(struct slabinfo));
1026            }
1027        }
1028    }
1029}
1030
1031static void sort_aliases(void)
1032{
1033    struct aliasinfo *a1,*a2;
1034
1035    for (a1 = aliasinfo; a1 < aliasinfo + aliases; a1++) {
1036        for (a2 = a1 + 1; a2 < aliasinfo + aliases; a2++) {
1037            char *n1, *n2;
1038
1039            n1 = a1->name;
1040            n2 = a2->name;
1041            if (show_alias && !show_inverted) {
1042                n1 = a1->ref;
1043                n2 = a2->ref;
1044            }
1045            if (strcasecmp(n1, n2) > 0) {
1046                struct aliasinfo t;
1047
1048                memcpy(&t, a1, sizeof(struct aliasinfo));
1049                memcpy(a1, a2, sizeof(struct aliasinfo));
1050                memcpy(a2, &t, sizeof(struct aliasinfo));
1051            }
1052        }
1053    }
1054}
1055
1056static void link_slabs(void)
1057{
1058    struct aliasinfo *a;
1059    struct slabinfo *s;
1060
1061    for (a = aliasinfo; a < aliasinfo + aliases; a++) {
1062
1063        for (s = slabinfo; s < slabinfo + slabs; s++)
1064            if (strcmp(a->ref, s->name) == 0) {
1065                a->slab = s;
1066                s->refs++;
1067                break;
1068            }
1069        if (s == slabinfo + slabs)
1070            fatal("Unresolved alias %s\n", a->ref);
1071    }
1072}
1073
1074static void alias(void)
1075{
1076    struct aliasinfo *a;
1077    char *active = NULL;
1078
1079    sort_aliases();
1080    link_slabs();
1081
1082    for(a = aliasinfo; a < aliasinfo + aliases; a++) {
1083
1084        if (!show_single_ref && a->slab->refs == 1)
1085            continue;
1086
1087        if (!show_inverted) {
1088            if (active) {
1089                if (strcmp(a->slab->name, active) == 0) {
1090                    printf(" %s", a->name);
1091                    continue;
1092                }
1093            }
1094            printf("\n%-12s <- %s", a->slab->name, a->name);
1095            active = a->slab->name;
1096        }
1097        else
1098            printf("%-20s -> %s\n", a->name, a->slab->name);
1099    }
1100    if (active)
1101        printf("\n");
1102}
1103
1104
1105static void rename_slabs(void)
1106{
1107    struct slabinfo *s;
1108    struct aliasinfo *a;
1109
1110    for (s = slabinfo; s < slabinfo + slabs; s++) {
1111        if (*s->name != ':')
1112            continue;
1113
1114        if (s->refs > 1 && !show_first_alias)
1115            continue;
1116
1117        a = find_one_alias(s);
1118
1119        if (a)
1120            s->name = a->name;
1121        else {
1122            s->name = "*";
1123            actual_slabs--;
1124        }
1125    }
1126}
1127
1128static int slab_mismatch(char *slab)
1129{
1130    return regexec(&pattern, slab, 0, NULL, 0);
1131}
1132
1133static void read_slab_dir(void)
1134{
1135    DIR *dir;
1136    struct dirent *de;
1137    struct slabinfo *slab = slabinfo;
1138    struct aliasinfo *alias = aliasinfo;
1139    char *p;
1140    char *t;
1141    int count;
1142
1143    if (chdir("/sys/kernel/slab") && chdir("/sys/slab"))
1144        fatal("SYSFS support for SLUB not active\n");
1145
1146    dir = opendir(".");
1147    while ((de = readdir(dir))) {
1148        if (de->d_name[0] == '.' ||
1149            (de->d_name[0] != ':' && slab_mismatch(de->d_name)))
1150                continue;
1151        switch (de->d_type) {
1152           case DT_LNK:
1153            alias->name = strdup(de->d_name);
1154            count = readlink(de->d_name, buffer, sizeof(buffer)-1);
1155
1156            if (count < 0)
1157                fatal("Cannot read symlink %s\n", de->d_name);
1158
1159            buffer[count] = 0;
1160            p = buffer + count;
1161            while (p > buffer && p[-1] != '/')
1162                p--;
1163            alias->ref = strdup(p);
1164            alias++;
1165            break;
1166           case DT_DIR:
1167            if (chdir(de->d_name))
1168                fatal("Unable to access slab %s\n", slab->name);
1169            slab->name = strdup(de->d_name);
1170            slab->alias = 0;
1171            slab->refs = 0;
1172            slab->aliases = get_obj("aliases");
1173            slab->align = get_obj("align");
1174            slab->cache_dma = get_obj("cache_dma");
1175            slab->cpu_slabs = get_obj("cpu_slabs");
1176            slab->destroy_by_rcu = get_obj("destroy_by_rcu");
1177            slab->hwcache_align = get_obj("hwcache_align");
1178            slab->object_size = get_obj("object_size");
1179            slab->objects = get_obj("objects");
1180            slab->objects_partial = get_obj("objects_partial");
1181            slab->objects_total = get_obj("objects_total");
1182            slab->objs_per_slab = get_obj("objs_per_slab");
1183            slab->order = get_obj("order");
1184            slab->partial = get_obj("partial");
1185            slab->partial = get_obj_and_str("partial", &t);
1186            decode_numa_list(slab->numa_partial, t);
1187            free(t);
1188            slab->poison = get_obj("poison");
1189            slab->reclaim_account = get_obj("reclaim_account");
1190            slab->red_zone = get_obj("red_zone");
1191            slab->sanity_checks = get_obj("sanity_checks");
1192            slab->slab_size = get_obj("slab_size");
1193            slab->slabs = get_obj_and_str("slabs", &t);
1194            decode_numa_list(slab->numa, t);
1195            free(t);
1196            slab->store_user = get_obj("store_user");
1197            slab->trace = get_obj("trace");
1198            slab->alloc_fastpath = get_obj("alloc_fastpath");
1199            slab->alloc_slowpath = get_obj("alloc_slowpath");
1200            slab->free_fastpath = get_obj("free_fastpath");
1201            slab->free_slowpath = get_obj("free_slowpath");
1202            slab->free_frozen= get_obj("free_frozen");
1203            slab->free_add_partial = get_obj("free_add_partial");
1204            slab->free_remove_partial = get_obj("free_remove_partial");
1205            slab->alloc_from_partial = get_obj("alloc_from_partial");
1206            slab->alloc_slab = get_obj("alloc_slab");
1207            slab->alloc_refill = get_obj("alloc_refill");
1208            slab->free_slab = get_obj("free_slab");
1209            slab->cpuslab_flush = get_obj("cpuslab_flush");
1210            slab->deactivate_full = get_obj("deactivate_full");
1211            slab->deactivate_empty = get_obj("deactivate_empty");
1212            slab->deactivate_to_head = get_obj("deactivate_to_head");
1213            slab->deactivate_to_tail = get_obj("deactivate_to_tail");
1214            slab->deactivate_remote_frees = get_obj("deactivate_remote_frees");
1215            slab->order_fallback = get_obj("order_fallback");
1216            slab->cmpxchg_double_cpu_fail = get_obj("cmpxchg_double_cpu_fail");
1217            slab->cmpxchg_double_fail = get_obj("cmpxchg_double_fail");
1218            slab->cpu_partial_alloc = get_obj("cpu_partial_alloc");
1219            slab->cpu_partial_free = get_obj("cpu_partial_free");
1220            slab->alloc_node_mismatch = get_obj("alloc_node_mismatch");
1221            slab->deactivate_bypass = get_obj("deactivate_bypass");
1222            chdir("..");
1223            if (slab->name[0] == ':')
1224                alias_targets++;
1225            slab++;
1226            break;
1227           default :
1228            fatal("Unknown file type %lx\n", de->d_type);
1229        }
1230    }
1231    closedir(dir);
1232    slabs = slab - slabinfo;
1233    actual_slabs = slabs;
1234    aliases = alias - aliasinfo;
1235    if (slabs > MAX_SLABS)
1236        fatal("Too many slabs\n");
1237    if (aliases > MAX_ALIASES)
1238        fatal("Too many aliases\n");
1239}
1240
1241static void output_slabs(void)
1242{
1243    struct slabinfo *slab;
1244
1245    for (slab = slabinfo; slab < slabinfo + slabs; slab++) {
1246
1247        if (slab->alias)
1248            continue;
1249
1250
1251        if (show_numa)
1252            slab_numa(slab, 0);
1253        else if (show_track)
1254            show_tracking(slab);
1255        else if (validate)
1256            slab_validate(slab);
1257        else if (shrink)
1258            slab_shrink(slab);
1259        else if (set_debug)
1260            slab_debug(slab);
1261        else if (show_ops)
1262            ops(slab);
1263        else if (show_slab)
1264            slabcache(slab);
1265        else if (show_report)
1266            report(slab);
1267    }
1268}
1269
1270struct option opts[] = {
1271    { "aliases", 0, NULL, 'a' },
1272    { "activity", 0, NULL, 'A' },
1273    { "debug", 2, NULL, 'd' },
1274    { "display-activity", 0, NULL, 'D' },
1275    { "empty", 0, NULL, 'e' },
1276    { "first-alias", 0, NULL, 'f' },
1277    { "help", 0, NULL, 'h' },
1278    { "inverted", 0, NULL, 'i'},
1279    { "numa", 0, NULL, 'n' },
1280    { "ops", 0, NULL, 'o' },
1281    { "report", 0, NULL, 'r' },
1282    { "shrink", 0, NULL, 's' },
1283    { "slabs", 0, NULL, 'l' },
1284    { "track", 0, NULL, 't'},
1285    { "validate", 0, NULL, 'v' },
1286    { "zero", 0, NULL, 'z' },
1287    { "1ref", 0, NULL, '1'},
1288    { NULL, 0, NULL, 0 }
1289};
1290
1291int main(int argc, char *argv[])
1292{
1293    int c;
1294    int err;
1295    char *pattern_source;
1296
1297    page_size = getpagesize();
1298
1299    while ((c = getopt_long(argc, argv, "aAd::Defhil1noprstvzTS",
1300                        opts, NULL)) != -1)
1301        switch (c) {
1302        case '1':
1303            show_single_ref = 1;
1304            break;
1305        case 'a':
1306            show_alias = 1;
1307            break;
1308        case 'A':
1309            sort_active = 1;
1310            break;
1311        case 'd':
1312            set_debug = 1;
1313            if (!debug_opt_scan(optarg))
1314                fatal("Invalid debug option '%s'\n", optarg);
1315            break;
1316        case 'D':
1317            show_activity = 1;
1318            break;
1319        case 'e':
1320            show_empty = 1;
1321            break;
1322        case 'f':
1323            show_first_alias = 1;
1324            break;
1325        case 'h':
1326            usage();
1327            return 0;
1328        case 'i':
1329            show_inverted = 1;
1330            break;
1331        case 'n':
1332            show_numa = 1;
1333            break;
1334        case 'o':
1335            show_ops = 1;
1336            break;
1337        case 'r':
1338            show_report = 1;
1339            break;
1340        case 's':
1341            shrink = 1;
1342            break;
1343        case 'l':
1344            show_slab = 1;
1345            break;
1346        case 't':
1347            show_track = 1;
1348            break;
1349        case 'v':
1350            validate = 1;
1351            break;
1352        case 'z':
1353            skip_zero = 0;
1354            break;
1355        case 'T':
1356            show_totals = 1;
1357            break;
1358        case 'S':
1359            sort_size = 1;
1360            break;
1361
1362        default:
1363            fatal("%s: Invalid option '%c'\n", argv[0], optopt);
1364
1365    }
1366
1367    if (!show_slab && !show_alias && !show_track && !show_report
1368        && !validate && !shrink && !set_debug && !show_ops)
1369            show_slab = 1;
1370
1371    if (argc > optind)
1372        pattern_source = argv[optind];
1373    else
1374        pattern_source = ".*";
1375
1376    err = regcomp(&pattern, pattern_source, REG_ICASE|REG_NOSUB);
1377    if (err)
1378        fatal("%s: Invalid pattern '%s' code %d\n",
1379            argv[0], pattern_source, err);
1380    read_slab_dir();
1381    if (show_alias)
1382        alias();
1383    else
1384    if (show_totals)
1385        totals();
1386    else {
1387        link_slabs();
1388        rename_slabs();
1389        sort_slabs();
1390        output_slabs();
1391    }
1392    return 0;
1393}
1394

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