| 1 | |
| 2 | * kernel/lockdep_proc.c
|
| 3 | *
|
| 4 | * Runtime locking correctness validator
|
| 5 | *
|
| 6 | * Started by Ingo Molnar:
|
| 7 | *
|
| 8 | * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <[email protected]>
|
| 9 | * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <[email protected]>
|
| 10 | *
|
| 11 | * Code for /proc/lockdep and /proc/lockdep_stats:
|
| 12 | *
|
| 13 |
|
| 14 | #include <linux/module.h>
|
| 15 | #include <linux/proc_fs.h>
|
| 16 | #include <linux/seq_file.h>
|
| 17 | #include <linux/kallsyms.h>
|
| 18 | #include <linux/debug_locks.h>
|
| 19 | #include <linux/vmalloc.h>
|
| 20 | #include <linux/sort.h>
|
| 21 | #include <asm/uaccess.h>
|
| 22 | #include <asm/div64.h>
|
| 23 |
|
| 24 | #include "lockdep_internals.h"
|
| 25 |
|
| 26 | static void *l_next(struct seq_file *m, void *v, loff_t *pos)
|
| 27 | {
|
| 28 | return seq_list_next(v, &all_lock_classes, pos);
|
| 29 | }
|
| 30 |
|
| 31 | static void *l_start(struct seq_file *m, loff_t *pos)
|
| 32 | {
|
| 33 | return seq_list_start_head(&all_lock_classes, *pos);
|
| 34 | }
|
| 35 |
|
| 36 | static void l_stop(struct seq_file *m, void *v)
|
| 37 | {
|
| 38 | }
|
| 39 |
|
| 40 | static void print_name(struct seq_file *m, struct lock_class *class)
|
| 41 | {
|
| 42 | char str[128];
|
| 43 | const char *name = class->name;
|
| 44 |
|
| 45 | if (!name) {
|
| 46 | name = __get_key_name(class->key, str);
|
| 47 | seq_printf(m, "%s", name);
|
| 48 | } else{
|
| 49 | seq_printf(m, "%s", name);
|
| 50 | if (class->name_version > 1)
|
| 51 | seq_printf(m, "#%d", class->name_version);
|
| 52 | if (class->subclass)
|
| 53 | seq_printf(m, "/%d", class->subclass);
|
| 54 | }
|
| 55 | }
|
| 56 |
|
| 57 | static int l_show(struct seq_file *m, void *v)
|
| 58 | {
|
| 59 | struct lock_class *class = list_entry(v, struct lock_class, lock_entry);
|
| 60 | struct lock_list *entry;
|
| 61 | char usage[LOCK_USAGE_CHARS];
|
| 62 |
|
| 63 | if (v == &all_lock_classes) {
|
| 64 | seq_printf(m, "all lock classes:\n");
|
| 65 | return 0;
|
| 66 | }
|
| 67 |
|
| 68 | seq_printf(m, "%p", class->key);
|
| 69 | #ifdef CONFIG_DEBUG_LOCKDEP
|
| 70 | seq_printf(m, " OPS:%8ld", class->ops);
|
| 71 | #endif
|
| 72 | #ifdef CONFIG_PROVE_LOCKING
|
| 73 | seq_printf(m, " FD:%5ld", lockdep_count_forward_deps(class));
|
| 74 | seq_printf(m, " BD:%5ld", lockdep_count_backward_deps(class));
|
| 75 | #endif
|
| 76 |
|
| 77 | get_usage_chars(class, usage);
|
| 78 | seq_printf(m, " %s", usage);
|
| 79 |
|
| 80 | seq_printf(m, ": ");
|
| 81 | print_name(m, class);
|
| 82 | seq_puts(m, "\n");
|
| 83 |
|
| 84 | list_for_each_entry(entry, &class->locks_after, entry) {
|
| 85 | if (entry->distance == 1) {
|
| 86 | seq_printf(m, " -> [%p] ", entry->class->key);
|
| 87 | print_name(m, entry->class);
|
| 88 | seq_puts(m, "\n");
|
| 89 | }
|
| 90 | }
|
| 91 | seq_puts(m, "\n");
|
| 92 |
|
| 93 | return 0;
|
| 94 | }
|
| 95 |
|
| 96 | static const struct seq_operations lockdep_ops = {
|
| 97 | .start = l_start,
|
| 98 | .next = l_next,
|
| 99 | .stop = l_stop,
|
| 100 | .show = l_show,
|
| 101 | };
|
| 102 |
|
| 103 | static int lockdep_open(struct inode *inode, struct file *file)
|
| 104 | {
|
| 105 | return seq_open(file, &lockdep_ops);
|
| 106 | }
|
| 107 |
|
| 108 | static const struct file_operations proc_lockdep_operations = {
|
| 109 | .open = lockdep_open,
|
| 110 | .read = seq_read,
|
| 111 | .llseek = seq_lseek,
|
| 112 | .release = seq_release,
|
| 113 | };
|
| 114 |
|
| 115 | #ifdef CONFIG_PROVE_LOCKING
|
| 116 | static void *lc_start(struct seq_file *m, loff_t *pos)
|
| 117 | {
|
| 118 | if (*pos == 0)
|
| 119 | return SEQ_START_TOKEN;
|
| 120 |
|
| 121 | if (*pos - 1 < nr_lock_chains)
|
| 122 | return lock_chains + (*pos - 1);
|
| 123 |
|
| 124 | return NULL;
|
| 125 | }
|
| 126 |
|
| 127 | static void *lc_next(struct seq_file *m, void *v, loff_t *pos)
|
| 128 | {
|
| 129 | (*pos)++;
|
| 130 | return lc_start(m, pos);
|
| 131 | }
|
| 132 |
|
| 133 | static void lc_stop(struct seq_file *m, void *v)
|
| 134 | {
|
| 135 | }
|
| 136 |
|
| 137 | static int lc_show(struct seq_file *m, void *v)
|
| 138 | {
|
| 139 | struct lock_chain *chain = v;
|
| 140 | struct lock_class *class;
|
| 141 | int i;
|
| 142 |
|
| 143 | if (v == SEQ_START_TOKEN) {
|
| 144 | seq_printf(m, "all lock chains:\n");
|
| 145 | return 0;
|
| 146 | }
|
| 147 |
|
| 148 | seq_printf(m, "irq_context: %d\n", chain->irq_context);
|
| 149 |
|
| 150 | for (i = 0; i < chain->depth; i++) {
|
| 151 | class = lock_chain_get_class(chain, i);
|
| 152 | if (!class->key)
|
| 153 | continue;
|
| 154 |
|
| 155 | seq_printf(m, "[%p] ", class->key);
|
| 156 | print_name(m, class);
|
| 157 | seq_puts(m, "\n");
|
| 158 | }
|
| 159 | seq_puts(m, "\n");
|
| 160 |
|
| 161 | return 0;
|
| 162 | }
|
| 163 |
|
| 164 | static const struct seq_operations lockdep_chains_ops = {
|
| 165 | .start = lc_start,
|
| 166 | .next = lc_next,
|
| 167 | .stop = lc_stop,
|
| 168 | .show = lc_show,
|
| 169 | };
|
| 170 |
|
| 171 | static int lockdep_chains_open(struct inode *inode, struct file *file)
|
| 172 | {
|
| 173 | return seq_open(file, &lockdep_chains_ops);
|
| 174 | }
|
| 175 |
|
| 176 | static const struct file_operations proc_lockdep_chains_operations = {
|
| 177 | .open = lockdep_chains_open,
|
| 178 | .read = seq_read,
|
| 179 | .llseek = seq_lseek,
|
| 180 | .release = seq_release,
|
| 181 | };
|
| 182 | #endif
|
| 183 |
|
| 184 | static void lockdep_stats_debug_show(struct seq_file *m)
|
| 185 | {
|
| 186 | #ifdef CONFIG_DEBUG_LOCKDEP
|
| 187 | unsigned long long hi1 = debug_atomic_read(hardirqs_on_events),
|
| 188 | hi2 = debug_atomic_read(hardirqs_off_events),
|
| 189 | hr1 = debug_atomic_read(redundant_hardirqs_on),
|
| 190 | hr2 = debug_atomic_read(redundant_hardirqs_off),
|
| 191 | si1 = debug_atomic_read(softirqs_on_events),
|
| 192 | si2 = debug_atomic_read(softirqs_off_events),
|
| 193 | sr1 = debug_atomic_read(redundant_softirqs_on),
|
| 194 | sr2 = debug_atomic_read(redundant_softirqs_off);
|
| 195 |
|
| 196 | seq_printf(m, " chain lookup misses: %11llu\n",
|
| 197 | debug_atomic_read(chain_lookup_misses));
|
| 198 | seq_printf(m, " chain lookup hits: %11llu\n",
|
| 199 | debug_atomic_read(chain_lookup_hits));
|
| 200 | seq_printf(m, " cyclic checks: %11llu\n",
|
| 201 | debug_atomic_read(nr_cyclic_checks));
|
| 202 | seq_printf(m, " find-mask forwards checks: %11llu\n",
|
| 203 | debug_atomic_read(nr_find_usage_forwards_checks));
|
| 204 | seq_printf(m, " find-mask backwards checks: %11llu\n",
|
| 205 | debug_atomic_read(nr_find_usage_backwards_checks));
|
| 206 |
|
| 207 | seq_printf(m, " hardirq on events: %11llu\n", hi1);
|
| 208 | seq_printf(m, " hardirq off events: %11llu\n", hi2);
|
| 209 | seq_printf(m, " redundant hardirq ons: %11llu\n", hr1);
|
| 210 | seq_printf(m, " redundant hardirq offs: %11llu\n", hr2);
|
| 211 | seq_printf(m, " softirq on events: %11llu\n", si1);
|
| 212 | seq_printf(m, " softirq off events: %11llu\n", si2);
|
| 213 | seq_printf(m, " redundant softirq ons: %11llu\n", sr1);
|
| 214 | seq_printf(m, " redundant softirq offs: %11llu\n", sr2);
|
| 215 | #endif
|
| 216 | }
|
| 217 |
|
| 218 | static int lockdep_stats_show(struct seq_file *m, void *v)
|
| 219 | {
|
| 220 | struct lock_class *class;
|
| 221 | unsigned long nr_unused = 0, nr_uncategorized = 0,
|
| 222 | nr_irq_safe = 0, nr_irq_unsafe = 0,
|
| 223 | nr_softirq_safe = 0, nr_softirq_unsafe = 0,
|
| 224 | nr_hardirq_safe = 0, nr_hardirq_unsafe = 0,
|
| 225 | nr_irq_read_safe = 0, nr_irq_read_unsafe = 0,
|
| 226 | nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0,
|
| 227 | nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0,
|
| 228 | sum_forward_deps = 0;
|
| 229 |
|
| 230 | list_for_each_entry(class, &all_lock_classes, lock_entry) {
|
| 231 |
|
| 232 | if (class->usage_mask == 0)
|
| 233 | nr_unused++;
|
| 234 | if (class->usage_mask == LOCKF_USED)
|
| 235 | nr_uncategorized++;
|
| 236 | if (class->usage_mask & LOCKF_USED_IN_IRQ)
|
| 237 | nr_irq_safe++;
|
| 238 | if (class->usage_mask & LOCKF_ENABLED_IRQ)
|
| 239 | nr_irq_unsafe++;
|
| 240 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ)
|
| 241 | nr_softirq_safe++;
|
| 242 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ)
|
| 243 | nr_softirq_unsafe++;
|
| 244 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ)
|
| 245 | nr_hardirq_safe++;
|
| 246 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQ)
|
| 247 | nr_hardirq_unsafe++;
|
| 248 | if (class->usage_mask & LOCKF_USED_IN_IRQ_READ)
|
| 249 | nr_irq_read_safe++;
|
| 250 | if (class->usage_mask & LOCKF_ENABLED_IRQ_READ)
|
| 251 | nr_irq_read_unsafe++;
|
| 252 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ)
|
| 253 | nr_softirq_read_safe++;
|
| 254 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ)
|
| 255 | nr_softirq_read_unsafe++;
|
| 256 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ)
|
| 257 | nr_hardirq_read_safe++;
|
| 258 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ)
|
| 259 | nr_hardirq_read_unsafe++;
|
| 260 |
|
| 261 | #ifdef CONFIG_PROVE_LOCKING
|
| 262 | sum_forward_deps += lockdep_count_forward_deps(class);
|
| 263 | #endif
|
| 264 | }
|
| 265 | #ifdef CONFIG_DEBUG_LOCKDEP
|
| 266 | DEBUG_LOCKS_WARN_ON(debug_atomic_read(nr_unused_locks) != nr_unused);
|
| 267 | #endif
|
| 268 | seq_printf(m, " lock-classes: %11lu [max: %lu]\n",
|
| 269 | nr_lock_classes, MAX_LOCKDEP_KEYS);
|
| 270 | seq_printf(m, " direct dependencies: %11lu [max: %lu]\n",
|
| 271 | nr_list_entries, MAX_LOCKDEP_ENTRIES);
|
| 272 | seq_printf(m, " indirect dependencies: %11lu\n",
|
| 273 | sum_forward_deps);
|
| 274 |
|
| 275 | |
| 276 | * Total number of dependencies:
|
| 277 | *
|
| 278 | * All irq-safe locks may nest inside irq-unsafe locks,
|
| 279 | * plus all the other known dependencies:
|
| 280 |
|
| 281 | seq_printf(m, " all direct dependencies: %11lu\n",
|
| 282 | nr_irq_unsafe * nr_irq_safe +
|
| 283 | nr_hardirq_unsafe * nr_hardirq_safe +
|
| 284 | nr_list_entries);
|
| 285 |
|
| 286 | #ifdef CONFIG_PROVE_LOCKING
|
| 287 | seq_printf(m, " dependency chains: %11lu [max: %lu]\n",
|
| 288 | nr_lock_chains, MAX_LOCKDEP_CHAINS);
|
| 289 | seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n",
|
| 290 | nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS);
|
| 291 | #endif
|
| 292 |
|
| 293 | #ifdef CONFIG_TRACE_IRQFLAGS
|
| 294 | seq_printf(m, " in-hardirq chains: %11u\n",
|
| 295 | nr_hardirq_chains);
|
| 296 | seq_printf(m, " in-softirq chains: %11u\n",
|
| 297 | nr_softirq_chains);
|
| 298 | #endif
|
| 299 | seq_printf(m, " in-process chains: %11u\n",
|
| 300 | nr_process_chains);
|
| 301 | seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n",
|
| 302 | nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES);
|
| 303 | seq_printf(m, " combined max dependencies: %11u\n",
|
| 304 | (nr_hardirq_chains + 1) *
|
| 305 | (nr_softirq_chains + 1) *
|
| 306 | (nr_process_chains + 1)
|
| 307 | );
|
| 308 | seq_printf(m, " hardirq-safe locks: %11lu\n",
|
| 309 | nr_hardirq_safe);
|
| 310 | seq_printf(m, " hardirq-unsafe locks: %11lu\n",
|
| 311 | nr_hardirq_unsafe);
|
| 312 | seq_printf(m, " softirq-safe locks: %11lu\n",
|
| 313 | nr_softirq_safe);
|
| 314 | seq_printf(m, " softirq-unsafe locks: %11lu\n",
|
| 315 | nr_softirq_unsafe);
|
| 316 | seq_printf(m, " irq-safe locks: %11lu\n",
|
| 317 | nr_irq_safe);
|
| 318 | seq_printf(m, " irq-unsafe locks: %11lu\n",
|
| 319 | nr_irq_unsafe);
|
| 320 |
|
| 321 | seq_printf(m, " hardirq-read-safe locks: %11lu\n",
|
| 322 | nr_hardirq_read_safe);
|
| 323 | seq_printf(m, " hardirq-read-unsafe locks: %11lu\n",
|
| 324 | nr_hardirq_read_unsafe);
|
| 325 | seq_printf(m, " softirq-read-safe locks: %11lu\n",
|
| 326 | nr_softirq_read_safe);
|
| 327 | seq_printf(m, " softirq-read-unsafe locks: %11lu\n",
|
| 328 | nr_softirq_read_unsafe);
|
| 329 | seq_printf(m, " irq-read-safe locks: %11lu\n",
|
| 330 | nr_irq_read_safe);
|
| 331 | seq_printf(m, " irq-read-unsafe locks: %11lu\n",
|
| 332 | nr_irq_read_unsafe);
|
| 333 |
|
| 334 | seq_printf(m, " uncategorized locks: %11lu\n",
|
| 335 | nr_uncategorized);
|
| 336 | seq_printf(m, " unused locks: %11lu\n",
|
| 337 | nr_unused);
|
| 338 | seq_printf(m, " max locking depth: %11u\n",
|
| 339 | max_lockdep_depth);
|
| 340 | #ifdef CONFIG_PROVE_LOCKING
|
| 341 | seq_printf(m, " max bfs queue depth: %11u\n",
|
| 342 | max_bfs_queue_depth);
|
| 343 | #endif
|
| 344 | lockdep_stats_debug_show(m);
|
| 345 | seq_printf(m, " debug_locks: %11u\n",
|
| 346 | debug_locks);
|
| 347 |
|
| 348 | return 0;
|
| 349 | }
|
| 350 |
|
| 351 | static int lockdep_stats_open(struct inode *inode, struct file *file)
|
| 352 | {
|
| 353 | return single_open(file, lockdep_stats_show, NULL);
|
| 354 | }
|
| 355 |
|
| 356 | static const struct file_operations proc_lockdep_stats_operations = {
|
| 357 | .open = lockdep_stats_open,
|
| 358 | .read = seq_read,
|
| 359 | .llseek = seq_lseek,
|
| 360 | .release = single_release,
|
| 361 | };
|
| 362 |
|
| 363 | #ifdef CONFIG_LOCK_STAT
|
| 364 |
|
| 365 | struct lock_stat_data {
|
| 366 | struct lock_class *class;
|
| 367 | struct lock_class_stats stats;
|
| 368 | };
|
| 369 |
|
| 370 | struct lock_stat_seq {
|
| 371 | struct lock_stat_data *iter_end;
|
| 372 | struct lock_stat_data stats[MAX_LOCKDEP_KEYS];
|
| 373 | };
|
| 374 |
|
| 375 | |
| 376 | * sort on absolute number of contentions
|
| 377 |
|
| 378 | static int lock_stat_cmp(const void *l, const void *r)
|
| 379 | {
|
| 380 | const struct lock_stat_data *dl = l, *dr = r;
|
| 381 | unsigned long nl, nr;
|
| 382 |
|
| 383 | nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr;
|
| 384 | nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr;
|
| 385 |
|
| 386 | return nr - nl;
|
| 387 | }
|
| 388 |
|
| 389 | static void seq_line(struct seq_file *m, char c, int offset, int length)
|
| 390 | {
|
| 391 | int i;
|
| 392 |
|
| 393 | for (i = 0; i < offset; i++)
|
| 394 | seq_puts(m, " ");
|
| 395 | for (i = 0; i < length; i++)
|
| 396 | seq_printf(m, "%c", c);
|
| 397 | seq_puts(m, "\n");
|
| 398 | }
|
| 399 |
|
| 400 | static void snprint_time(char *buf, size_t bufsiz, s64 nr)
|
| 401 | {
|
| 402 | s64 div;
|
| 403 | s32 rem;
|
| 404 |
|
| 405 | nr += 5;
|
| 406 | div = div_s64_rem(nr, 1000, &rem);
|
| 407 | snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10);
|
| 408 | }
|
| 409 |
|
| 410 | static void seq_time(struct seq_file *m, s64 time)
|
| 411 | {
|
| 412 | char num[15];
|
| 413 |
|
| 414 | snprint_time(num, sizeof(num), time);
|
| 415 | seq_printf(m, " %14s", num);
|
| 416 | }
|
| 417 |
|
| 418 | static void seq_lock_time(struct seq_file *m, struct lock_time *lt)
|
| 419 | {
|
| 420 | seq_printf(m, "%14lu", lt->nr);
|
| 421 | seq_time(m, lt->min);
|
| 422 | seq_time(m, lt->max);
|
| 423 | seq_time(m, lt->total);
|
| 424 | }
|
| 425 |
|
| 426 | static void seq_stats(struct seq_file *m, struct lock_stat_data *data)
|
| 427 | {
|
| 428 | char name[39];
|
| 429 | struct lock_class *class;
|
| 430 | struct lock_class_stats *stats;
|
| 431 | int i, namelen;
|
| 432 |
|
| 433 | class = data->class;
|
| 434 | stats = &data->stats;
|
| 435 |
|
| 436 | namelen = 38;
|
| 437 | if (class->name_version > 1)
|
| 438 | namelen -= 2;
|
| 439 | if (class->subclass)
|
| 440 | namelen -= 2;
|
| 441 |
|
| 442 | if (!class->name) {
|
| 443 | char str[KSYM_NAME_LEN];
|
| 444 | const char *key_name;
|
| 445 |
|
| 446 | key_name = __get_key_name(class->key, str);
|
| 447 | snprintf(name, namelen, "%s", key_name);
|
| 448 | } else {
|
| 449 | snprintf(name, namelen, "%s", class->name);
|
| 450 | }
|
| 451 | namelen = strlen(name);
|
| 452 | if (class->name_version > 1) {
|
| 453 | snprintf(name+namelen, 3, "#%d", class->name_version);
|
| 454 | namelen += 2;
|
| 455 | }
|
| 456 | if (class->subclass) {
|
| 457 | snprintf(name+namelen, 3, "/%d", class->subclass);
|
| 458 | namelen += 2;
|
| 459 | }
|
| 460 |
|
| 461 | if (stats->write_holdtime.nr) {
|
| 462 | if (stats->read_holdtime.nr)
|
| 463 | seq_printf(m, "%38s-W:", name);
|
| 464 | else
|
| 465 | seq_printf(m, "%40s:", name);
|
| 466 |
|
| 467 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]);
|
| 468 | seq_lock_time(m, &stats->write_waittime);
|
| 469 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]);
|
| 470 | seq_lock_time(m, &stats->write_holdtime);
|
| 471 | seq_puts(m, "\n");
|
| 472 | }
|
| 473 |
|
| 474 | if (stats->read_holdtime.nr) {
|
| 475 | seq_printf(m, "%38s-R:", name);
|
| 476 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]);
|
| 477 | seq_lock_time(m, &stats->read_waittime);
|
| 478 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]);
|
| 479 | seq_lock_time(m, &stats->read_holdtime);
|
| 480 | seq_puts(m, "\n");
|
| 481 | }
|
| 482 |
|
| 483 | if (stats->read_waittime.nr + stats->write_waittime.nr == 0)
|
| 484 | return;
|
| 485 |
|
| 486 | if (stats->read_holdtime.nr)
|
| 487 | namelen += 2;
|
| 488 |
|
| 489 | for (i = 0; i < LOCKSTAT_POINTS; i++) {
|
| 490 | char ip[32];
|
| 491 |
|
| 492 | if (class->contention_point[i] == 0)
|
| 493 | break;
|
| 494 |
|
| 495 | if (!i)
|
| 496 | seq_line(m, '-', 40-namelen, namelen);
|
| 497 |
|
| 498 | snprintf(ip, sizeof(ip), "[<%p>]",
|
| 499 | (void *)class->contention_point[i]);
|
| 500 | seq_printf(m, "%40s %14lu %29s %pS\n",
|
| 501 | name, stats->contention_point[i],
|
| 502 | ip, (void *)class->contention_point[i]);
|
| 503 | }
|
| 504 | for (i = 0; i < LOCKSTAT_POINTS; i++) {
|
| 505 | char ip[32];
|
| 506 |
|
| 507 | if (class->contending_point[i] == 0)
|
| 508 | break;
|
| 509 |
|
| 510 | if (!i)
|
| 511 | seq_line(m, '-', 40-namelen, namelen);
|
| 512 |
|
| 513 | snprintf(ip, sizeof(ip), "[<%p>]",
|
| 514 | (void *)class->contending_point[i]);
|
| 515 | seq_printf(m, "%40s %14lu %29s %pS\n",
|
| 516 | name, stats->contending_point[i],
|
| 517 | ip, (void *)class->contending_point[i]);
|
| 518 | }
|
| 519 | if (i) {
|
| 520 | seq_puts(m, "\n");
|
| 521 | seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1));
|
| 522 | seq_puts(m, "\n");
|
| 523 | }
|
| 524 | }
|
| 525 |
|
| 526 | static void seq_header(struct seq_file *m)
|
| 527 | {
|
| 528 | seq_printf(m, "lock_stat version 0.3\n");
|
| 529 |
|
| 530 | if (unlikely(!debug_locks))
|
| 531 | seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n");
|
| 532 |
|
| 533 | seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1));
|
| 534 | seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s "
|
| 535 | "%14s %14s\n",
|
| 536 | "class name",
|
| 537 | "con-bounces",
|
| 538 | "contentions",
|
| 539 | "waittime-min",
|
| 540 | "waittime-max",
|
| 541 | "waittime-total",
|
| 542 | "acq-bounces",
|
| 543 | "acquisitions",
|
| 544 | "holdtime-min",
|
| 545 | "holdtime-max",
|
| 546 | "holdtime-total");
|
| 547 | seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1));
|
| 548 | seq_printf(m, "\n");
|
| 549 | }
|
| 550 |
|
| 551 | static void *ls_start(struct seq_file *m, loff_t *pos)
|
| 552 | {
|
| 553 | struct lock_stat_seq *data = m->private;
|
| 554 | struct lock_stat_data *iter;
|
| 555 |
|
| 556 | if (*pos == 0)
|
| 557 | return SEQ_START_TOKEN;
|
| 558 |
|
| 559 | iter = data->stats + (*pos - 1);
|
| 560 | if (iter >= data->iter_end)
|
| 561 | iter = NULL;
|
| 562 |
|
| 563 | return iter;
|
| 564 | }
|
| 565 |
|
| 566 | static void *ls_next(struct seq_file *m, void *v, loff_t *pos)
|
| 567 | {
|
| 568 | (*pos)++;
|
| 569 | return ls_start(m, pos);
|
| 570 | }
|
| 571 |
|
| 572 | static void ls_stop(struct seq_file *m, void *v)
|
| 573 | {
|
| 574 | }
|
| 575 |
|
| 576 | static int ls_show(struct seq_file *m, void *v)
|
| 577 | {
|
| 578 | if (v == SEQ_START_TOKEN)
|
| 579 | seq_header(m);
|
| 580 | else
|
| 581 | seq_stats(m, v);
|
| 582 |
|
| 583 | return 0;
|
| 584 | }
|
| 585 |
|
| 586 | static const struct seq_operations lockstat_ops = {
|
| 587 | .start = ls_start,
|
| 588 | .next = ls_next,
|
| 589 | .stop = ls_stop,
|
| 590 | .show = ls_show,
|
| 591 | };
|
| 592 |
|
| 593 | static int lock_stat_open(struct inode *inode, struct file *file)
|
| 594 | {
|
| 595 | int res;
|
| 596 | struct lock_class *class;
|
| 597 | struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq));
|
| 598 |
|
| 599 | if (!data)
|
| 600 | return -ENOMEM;
|
| 601 |
|
| 602 | res = seq_open(file, &lockstat_ops);
|
| 603 | if (!res) {
|
| 604 | struct lock_stat_data *iter = data->stats;
|
| 605 | struct seq_file *m = file->private_data;
|
| 606 |
|
| 607 | list_for_each_entry(class, &all_lock_classes, lock_entry) {
|
| 608 | iter->class = class;
|
| 609 | iter->stats = lock_stats(class);
|
| 610 | iter++;
|
| 611 | }
|
| 612 | data->iter_end = iter;
|
| 613 |
|
| 614 | sort(data->stats, data->iter_end - data->stats,
|
| 615 | sizeof(struct lock_stat_data),
|
| 616 | lock_stat_cmp, NULL);
|
| 617 |
|
| 618 | m->private = data;
|
| 619 | } else
|
| 620 | vfree(data);
|
| 621 |
|
| 622 | return res;
|
| 623 | }
|
| 624 |
|
| 625 | static ssize_t lock_stat_write(struct file *file, const char __user *buf,
|
| 626 | size_t count, loff_t *ppos)
|
| 627 | {
|
| 628 | struct lock_class *class;
|
| 629 | char c;
|
| 630 |
|
| 631 | if (count) {
|
| 632 | if (get_user(c, buf))
|
| 633 | return -EFAULT;
|
| 634 |
|
| 635 | if (c != '0')
|
| 636 | return count;
|
| 637 |
|
| 638 | list_for_each_entry(class, &all_lock_classes, lock_entry)
|
| 639 | clear_lock_stats(class);
|
| 640 | }
|
| 641 | return count;
|
| 642 | }
|
| 643 |
|
| 644 | static int lock_stat_release(struct inode *inode, struct file *file)
|
| 645 | {
|
| 646 | struct seq_file *seq = file->private_data;
|
| 647 |
|
| 648 | vfree(seq->private);
|
| 649 | return seq_release(inode, file);
|
| 650 | }
|
| 651 |
|
| 652 | static const struct file_operations proc_lock_stat_operations = {
|
| 653 | .open = lock_stat_open,
|
| 654 | .write = lock_stat_write,
|
| 655 | .read = seq_read,
|
| 656 | .llseek = seq_lseek,
|
| 657 | .release = lock_stat_release,
|
| 658 | };
|
| 659 | #endif
|
| 660 |
|
| 661 | static int __init lockdep_proc_init(void)
|
| 662 | {
|
| 663 | proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations);
|
| 664 | #ifdef CONFIG_PROVE_LOCKING
|
| 665 | proc_create("lockdep_chains", S_IRUSR, NULL,
|
| 666 | &proc_lockdep_chains_operations);
|
| 667 | #endif
|
| 668 | proc_create("lockdep_stats", S_IRUSR, NULL,
|
| 669 | &proc_lockdep_stats_operations);
|
| 670 |
|
| 671 | #ifdef CONFIG_LOCK_STAT
|
| 672 | proc_create("lock_stat", S_IRUSR | S_IWUSR, NULL,
|
| 673 | &proc_lock_stat_operations);
|
| 674 | #endif
|
| 675 |
|
| 676 | return 0;
|
| 677 | }
|
| 678 |
|
| 679 | __initcall(lockdep_proc_init);
|
| 680 |
|