Root/tools/slub/slabinfo.c

Source at commit ec7cab4cbb721bff91ec924ec691efd8daf36579 created 9 years 7 months ago.
By Maarten ter Huurne, MIPS: JZ4740: A320: Updated quickstart documentation.
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
26struct 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
46struct aliasinfo {
47    char *name;
48    char *ref;
49    struct slabinfo *slab;
50} aliasinfo[MAX_ALIASES];
51
52int slabs = 0;
53int actual_slabs = 0;
54int aliases = 0;
55int alias_targets = 0;
56int highest_node = 0;
57
58char buffer[4096];
59
60int show_empty = 0;
61int show_report = 0;
62int show_alias = 0;
63int show_slab = 0;
64int skip_zero = 1;
65int show_numa = 0;
66int show_track = 0;
67int show_first_alias = 0;
68int validate = 0;
69int shrink = 0;
70int show_inverted = 0;
71int show_single_ref = 0;
72int show_totals = 0;
73int sort_size = 0;
74int sort_active = 0;
75int set_debug = 0;
76int show_ops = 0;
77int show_activity = 0;
78
79/* Debug options */
80int sanity = 0;
81int redzone = 0;
82int poison = 0;
83int tracking = 0;
84int tracing = 0;
85
86int page_size;
87
88regex_t pattern;
89
90static 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
100static 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
134static 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 */
154static unsigned long get_obj(const char *name)
155{
156    if (!read_obj(name))
157        return 0;
158
159    return atol(buffer);
160}
161
162static 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
181static 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
195static 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 */
218static 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
250static 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
275static void slab_validate(struct slabinfo *s)
276{
277    if (strcmp(s->name, "*") == 0)
278        return;
279
280    set_obj(s, "validate", 1);
281}
282
283static void slab_shrink(struct slabinfo *s)
284{
285    if (strcmp(s->name, "*") == 0)
286        return;
287
288    set_obj(s, "shrink", 1);
289}
290
291int line = 0;
292
293static 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 */
305static 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
321static unsigned long slab_size(struct slabinfo *s)
322{
323    return s->slabs * (page_size << s->order);
324}
325
326static 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
332static 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
377static 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
395static 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
408static const char *onoff(int x)
409{
410    if (x)
411        return "On ";
412    return "Off";
413}
414
415static 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
480static 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
521static 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 */
596static 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
645static 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
660static 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
720static 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
979static 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
1008static 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
1033static 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
1051static 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
1082static 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
1105static int slab_mismatch(char *slab)
1106{
1107    return regexec(&pattern, slab, 0, NULL, 0);
1108}
1109
1110static 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
1212static 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
1241struct 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
1262int 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

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