Commit | Line | Data |
---|---|---|
a8f24a39 IM |
1 | /* |
2 | * kernel/lockdep_proc.c | |
3 | * | |
4 | * Runtime locking correctness validator | |
5 | * | |
6 | * Started by Ingo Molnar: | |
7 | * | |
4b32d0a4 PZ |
8 | * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> |
9 | * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com> | |
a8f24a39 IM |
10 | * |
11 | * Code for /proc/lockdep and /proc/lockdep_stats: | |
12 | * | |
13 | */ | |
a8f24a39 IM |
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> | |
c46261de PZ |
19 | #include <linux/vmalloc.h> |
20 | #include <linux/sort.h> | |
21 | #include <asm/uaccess.h> | |
22 | #include <asm/div64.h> | |
a8f24a39 IM |
23 | |
24 | #include "lockdep_internals.h" | |
25 | ||
26 | static void *l_next(struct seq_file *m, void *v, loff_t *pos) | |
27 | { | |
8109e1de | 28 | return seq_list_next(v, &all_lock_classes, pos); |
a8f24a39 IM |
29 | } |
30 | ||
31 | static void *l_start(struct seq_file *m, loff_t *pos) | |
32 | { | |
8109e1de | 33 | return seq_list_start_head(&all_lock_classes, *pos); |
a8f24a39 IM |
34 | } |
35 | ||
36 | static void l_stop(struct seq_file *m, void *v) | |
37 | { | |
38 | } | |
39 | ||
068135e6 JB |
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 | ||
a8f24a39 IM |
57 | static int l_show(struct seq_file *m, void *v) |
58 | { | |
8109e1de | 59 | struct lock_class *class = list_entry(v, struct lock_class, lock_entry); |
068135e6 | 60 | struct lock_list *entry; |
f510b233 | 61 | char usage[LOCK_USAGE_CHARS]; |
a8f24a39 | 62 | |
8109e1de | 63 | if (v == &all_lock_classes) { |
94c61c0a TP |
64 | seq_printf(m, "all lock classes:\n"); |
65 | return 0; | |
66 | } | |
67 | ||
a8f24a39 IM |
68 | seq_printf(m, "%p", class->key); |
69 | #ifdef CONFIG_DEBUG_LOCKDEP | |
70 | seq_printf(m, " OPS:%8ld", class->ops); | |
71 | #endif | |
df60a844 SH |
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 | |
a8f24a39 | 76 | |
f510b233 PZ |
77 | get_usage_chars(class, usage); |
78 | seq_printf(m, " %s", usage); | |
a8f24a39 | 79 | |
068135e6 JB |
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) { | |
2429e4ee | 86 | seq_printf(m, " -> [%p] ", entry->class->key); |
068135e6 JB |
87 | print_name(m, entry->class); |
88 | seq_puts(m, "\n"); | |
89 | } | |
a8f24a39 IM |
90 | } |
91 | seq_puts(m, "\n"); | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
15ad7cdc | 96 | static const struct seq_operations lockdep_ops = { |
a8f24a39 IM |
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 | { | |
8109e1de | 105 | return seq_open(file, &lockdep_ops); |
a8f24a39 IM |
106 | } |
107 | ||
15ad7cdc | 108 | static const struct file_operations proc_lockdep_operations = { |
a8f24a39 IM |
109 | .open = lockdep_open, |
110 | .read = seq_read, | |
111 | .llseek = seq_lseek, | |
112 | .release = seq_release, | |
113 | }; | |
114 | ||
cd1a28e8 | 115 | #ifdef CONFIG_PROVE_LOCKING |
443cd507 HY |
116 | static void *lc_next(struct seq_file *m, void *v, loff_t *pos) |
117 | { | |
118 | struct lock_chain *chain; | |
119 | ||
120 | (*pos)++; | |
121 | ||
122 | if (v == SEQ_START_TOKEN) | |
123 | chain = m->private; | |
124 | else { | |
125 | chain = v; | |
126 | ||
e9d65725 LZ |
127 | if (*pos - 1 < nr_lock_chains) |
128 | chain = lock_chains + (*pos - 1); | |
443cd507 HY |
129 | else |
130 | chain = NULL; | |
131 | } | |
132 | ||
133 | return chain; | |
134 | } | |
135 | ||
136 | static void *lc_start(struct seq_file *m, loff_t *pos) | |
137 | { | |
138 | if (*pos == 0) | |
139 | return SEQ_START_TOKEN; | |
140 | ||
e9d65725 LZ |
141 | if (*pos - 1 < nr_lock_chains) |
142 | return lock_chains + (*pos - 1); | |
443cd507 HY |
143 | |
144 | return NULL; | |
145 | } | |
146 | ||
147 | static void lc_stop(struct seq_file *m, void *v) | |
148 | { | |
149 | } | |
150 | ||
151 | static int lc_show(struct seq_file *m, void *v) | |
152 | { | |
153 | struct lock_chain *chain = v; | |
154 | struct lock_class *class; | |
155 | int i; | |
156 | ||
157 | if (v == SEQ_START_TOKEN) { | |
158 | seq_printf(m, "all lock chains:\n"); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | seq_printf(m, "irq_context: %d\n", chain->irq_context); | |
163 | ||
164 | for (i = 0; i < chain->depth; i++) { | |
165 | class = lock_chain_get_class(chain, i); | |
8bfe0298 RV |
166 | if (!class->key) |
167 | continue; | |
168 | ||
443cd507 HY |
169 | seq_printf(m, "[%p] ", class->key); |
170 | print_name(m, class); | |
171 | seq_puts(m, "\n"); | |
172 | } | |
173 | seq_puts(m, "\n"); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static const struct seq_operations lockdep_chains_ops = { | |
179 | .start = lc_start, | |
180 | .next = lc_next, | |
181 | .stop = lc_stop, | |
182 | .show = lc_show, | |
183 | }; | |
184 | ||
185 | static int lockdep_chains_open(struct inode *inode, struct file *file) | |
186 | { | |
187 | int res = seq_open(file, &lockdep_chains_ops); | |
188 | if (!res) { | |
189 | struct seq_file *m = file->private_data; | |
190 | ||
191 | if (nr_lock_chains) | |
192 | m->private = lock_chains; | |
193 | else | |
194 | m->private = NULL; | |
195 | } | |
196 | return res; | |
197 | } | |
198 | ||
199 | static const struct file_operations proc_lockdep_chains_operations = { | |
200 | .open = lockdep_chains_open, | |
201 | .read = seq_read, | |
202 | .llseek = seq_lseek, | |
203 | .release = seq_release, | |
204 | }; | |
cd1a28e8 | 205 | #endif /* CONFIG_PROVE_LOCKING */ |
443cd507 | 206 | |
a8f24a39 IM |
207 | static void lockdep_stats_debug_show(struct seq_file *m) |
208 | { | |
209 | #ifdef CONFIG_DEBUG_LOCKDEP | |
210 | unsigned int hi1 = debug_atomic_read(&hardirqs_on_events), | |
211 | hi2 = debug_atomic_read(&hardirqs_off_events), | |
212 | hr1 = debug_atomic_read(&redundant_hardirqs_on), | |
213 | hr2 = debug_atomic_read(&redundant_hardirqs_off), | |
214 | si1 = debug_atomic_read(&softirqs_on_events), | |
215 | si2 = debug_atomic_read(&softirqs_off_events), | |
216 | sr1 = debug_atomic_read(&redundant_softirqs_on), | |
217 | sr2 = debug_atomic_read(&redundant_softirqs_off); | |
218 | ||
219 | seq_printf(m, " chain lookup misses: %11u\n", | |
220 | debug_atomic_read(&chain_lookup_misses)); | |
221 | seq_printf(m, " chain lookup hits: %11u\n", | |
222 | debug_atomic_read(&chain_lookup_hits)); | |
223 | seq_printf(m, " cyclic checks: %11u\n", | |
224 | debug_atomic_read(&nr_cyclic_checks)); | |
225 | seq_printf(m, " cyclic-check recursions: %11u\n", | |
226 | debug_atomic_read(&nr_cyclic_check_recursions)); | |
227 | seq_printf(m, " find-mask forwards checks: %11u\n", | |
228 | debug_atomic_read(&nr_find_usage_forwards_checks)); | |
229 | seq_printf(m, " find-mask forwards recursions: %11u\n", | |
230 | debug_atomic_read(&nr_find_usage_forwards_recursions)); | |
231 | seq_printf(m, " find-mask backwards checks: %11u\n", | |
232 | debug_atomic_read(&nr_find_usage_backwards_checks)); | |
233 | seq_printf(m, " find-mask backwards recursions:%11u\n", | |
234 | debug_atomic_read(&nr_find_usage_backwards_recursions)); | |
235 | ||
236 | seq_printf(m, " hardirq on events: %11u\n", hi1); | |
237 | seq_printf(m, " hardirq off events: %11u\n", hi2); | |
238 | seq_printf(m, " redundant hardirq ons: %11u\n", hr1); | |
239 | seq_printf(m, " redundant hardirq offs: %11u\n", hr2); | |
240 | seq_printf(m, " softirq on events: %11u\n", si1); | |
241 | seq_printf(m, " softirq off events: %11u\n", si2); | |
242 | seq_printf(m, " redundant softirq ons: %11u\n", sr1); | |
243 | seq_printf(m, " redundant softirq offs: %11u\n", sr2); | |
244 | #endif | |
245 | } | |
246 | ||
247 | static int lockdep_stats_show(struct seq_file *m, void *v) | |
248 | { | |
249 | struct lock_class *class; | |
250 | unsigned long nr_unused = 0, nr_uncategorized = 0, | |
251 | nr_irq_safe = 0, nr_irq_unsafe = 0, | |
252 | nr_softirq_safe = 0, nr_softirq_unsafe = 0, | |
253 | nr_hardirq_safe = 0, nr_hardirq_unsafe = 0, | |
254 | nr_irq_read_safe = 0, nr_irq_read_unsafe = 0, | |
255 | nr_softirq_read_safe = 0, nr_softirq_read_unsafe = 0, | |
256 | nr_hardirq_read_safe = 0, nr_hardirq_read_unsafe = 0, | |
257 | sum_forward_deps = 0, factor = 0; | |
258 | ||
259 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
260 | ||
261 | if (class->usage_mask == 0) | |
262 | nr_unused++; | |
263 | if (class->usage_mask == LOCKF_USED) | |
264 | nr_uncategorized++; | |
265 | if (class->usage_mask & LOCKF_USED_IN_IRQ) | |
266 | nr_irq_safe++; | |
4fc95e86 | 267 | if (class->usage_mask & LOCKF_ENABLED_IRQ) |
a8f24a39 IM |
268 | nr_irq_unsafe++; |
269 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ) | |
270 | nr_softirq_safe++; | |
4fc95e86 | 271 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ) |
a8f24a39 IM |
272 | nr_softirq_unsafe++; |
273 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ) | |
274 | nr_hardirq_safe++; | |
4fc95e86 | 275 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQ) |
a8f24a39 IM |
276 | nr_hardirq_unsafe++; |
277 | if (class->usage_mask & LOCKF_USED_IN_IRQ_READ) | |
278 | nr_irq_read_safe++; | |
4fc95e86 | 279 | if (class->usage_mask & LOCKF_ENABLED_IRQ_READ) |
a8f24a39 IM |
280 | nr_irq_read_unsafe++; |
281 | if (class->usage_mask & LOCKF_USED_IN_SOFTIRQ_READ) | |
282 | nr_softirq_read_safe++; | |
4fc95e86 | 283 | if (class->usage_mask & LOCKF_ENABLED_SOFTIRQ_READ) |
a8f24a39 IM |
284 | nr_softirq_read_unsafe++; |
285 | if (class->usage_mask & LOCKF_USED_IN_HARDIRQ_READ) | |
286 | nr_hardirq_read_safe++; | |
4fc95e86 | 287 | if (class->usage_mask & LOCKF_ENABLED_HARDIRQ_READ) |
a8f24a39 IM |
288 | nr_hardirq_read_unsafe++; |
289 | ||
df60a844 | 290 | #ifdef CONFIG_PROVE_LOCKING |
419ca3f1 | 291 | sum_forward_deps += lockdep_count_forward_deps(class); |
df60a844 | 292 | #endif |
a8f24a39 | 293 | } |
501b9ebf | 294 | #ifdef CONFIG_DEBUG_LOCKDEP |
a8f24a39 IM |
295 | DEBUG_LOCKS_WARN_ON(debug_atomic_read(&nr_unused_locks) != nr_unused); |
296 | #endif | |
297 | seq_printf(m, " lock-classes: %11lu [max: %lu]\n", | |
298 | nr_lock_classes, MAX_LOCKDEP_KEYS); | |
299 | seq_printf(m, " direct dependencies: %11lu [max: %lu]\n", | |
300 | nr_list_entries, MAX_LOCKDEP_ENTRIES); | |
301 | seq_printf(m, " indirect dependencies: %11lu\n", | |
302 | sum_forward_deps); | |
303 | ||
304 | /* | |
305 | * Total number of dependencies: | |
306 | * | |
307 | * All irq-safe locks may nest inside irq-unsafe locks, | |
308 | * plus all the other known dependencies: | |
309 | */ | |
310 | seq_printf(m, " all direct dependencies: %11lu\n", | |
311 | nr_irq_unsafe * nr_irq_safe + | |
312 | nr_hardirq_unsafe * nr_hardirq_safe + | |
313 | nr_list_entries); | |
314 | ||
315 | /* | |
316 | * Estimated factor between direct and indirect | |
317 | * dependencies: | |
318 | */ | |
319 | if (nr_list_entries) | |
320 | factor = sum_forward_deps / nr_list_entries; | |
321 | ||
8e18257d | 322 | #ifdef CONFIG_PROVE_LOCKING |
a8f24a39 IM |
323 | seq_printf(m, " dependency chains: %11lu [max: %lu]\n", |
324 | nr_lock_chains, MAX_LOCKDEP_CHAINS); | |
443cd507 | 325 | seq_printf(m, " dependency chain hlocks: %11d [max: %lu]\n", |
cd1a28e8 | 326 | nr_chain_hlocks, MAX_LOCKDEP_CHAIN_HLOCKS); |
8e18257d | 327 | #endif |
a8f24a39 IM |
328 | |
329 | #ifdef CONFIG_TRACE_IRQFLAGS | |
330 | seq_printf(m, " in-hardirq chains: %11u\n", | |
331 | nr_hardirq_chains); | |
332 | seq_printf(m, " in-softirq chains: %11u\n", | |
333 | nr_softirq_chains); | |
334 | #endif | |
335 | seq_printf(m, " in-process chains: %11u\n", | |
336 | nr_process_chains); | |
337 | seq_printf(m, " stack-trace entries: %11lu [max: %lu]\n", | |
338 | nr_stack_trace_entries, MAX_STACK_TRACE_ENTRIES); | |
339 | seq_printf(m, " combined max dependencies: %11u\n", | |
340 | (nr_hardirq_chains + 1) * | |
341 | (nr_softirq_chains + 1) * | |
342 | (nr_process_chains + 1) | |
343 | ); | |
344 | seq_printf(m, " hardirq-safe locks: %11lu\n", | |
345 | nr_hardirq_safe); | |
346 | seq_printf(m, " hardirq-unsafe locks: %11lu\n", | |
347 | nr_hardirq_unsafe); | |
348 | seq_printf(m, " softirq-safe locks: %11lu\n", | |
349 | nr_softirq_safe); | |
350 | seq_printf(m, " softirq-unsafe locks: %11lu\n", | |
351 | nr_softirq_unsafe); | |
352 | seq_printf(m, " irq-safe locks: %11lu\n", | |
353 | nr_irq_safe); | |
354 | seq_printf(m, " irq-unsafe locks: %11lu\n", | |
355 | nr_irq_unsafe); | |
356 | ||
357 | seq_printf(m, " hardirq-read-safe locks: %11lu\n", | |
358 | nr_hardirq_read_safe); | |
359 | seq_printf(m, " hardirq-read-unsafe locks: %11lu\n", | |
360 | nr_hardirq_read_unsafe); | |
361 | seq_printf(m, " softirq-read-safe locks: %11lu\n", | |
362 | nr_softirq_read_safe); | |
363 | seq_printf(m, " softirq-read-unsafe locks: %11lu\n", | |
364 | nr_softirq_read_unsafe); | |
365 | seq_printf(m, " irq-read-safe locks: %11lu\n", | |
366 | nr_irq_read_safe); | |
367 | seq_printf(m, " irq-read-unsafe locks: %11lu\n", | |
368 | nr_irq_read_unsafe); | |
369 | ||
370 | seq_printf(m, " uncategorized locks: %11lu\n", | |
371 | nr_uncategorized); | |
372 | seq_printf(m, " unused locks: %11lu\n", | |
373 | nr_unused); | |
374 | seq_printf(m, " max locking depth: %11u\n", | |
375 | max_lockdep_depth); | |
376 | seq_printf(m, " max recursion depth: %11u\n", | |
377 | max_recursion_depth); | |
bbfa2622 | 378 | #ifdef CONFIG_PROVE_LOCKING |
12f3dfd0 ML |
379 | seq_printf(m, " max bfs queue depth: %11u\n", |
380 | max_bfs_queue_depth); | |
bbfa2622 | 381 | #endif |
a8f24a39 IM |
382 | lockdep_stats_debug_show(m); |
383 | seq_printf(m, " debug_locks: %11u\n", | |
384 | debug_locks); | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | static int lockdep_stats_open(struct inode *inode, struct file *file) | |
390 | { | |
391 | return single_open(file, lockdep_stats_show, NULL); | |
392 | } | |
393 | ||
15ad7cdc | 394 | static const struct file_operations proc_lockdep_stats_operations = { |
a8f24a39 IM |
395 | .open = lockdep_stats_open, |
396 | .read = seq_read, | |
397 | .llseek = seq_lseek, | |
c0f33586 | 398 | .release = single_release, |
a8f24a39 IM |
399 | }; |
400 | ||
c46261de PZ |
401 | #ifdef CONFIG_LOCK_STAT |
402 | ||
403 | struct lock_stat_data { | |
404 | struct lock_class *class; | |
405 | struct lock_class_stats stats; | |
406 | }; | |
407 | ||
408 | struct lock_stat_seq { | |
409 | struct lock_stat_data *iter; | |
410 | struct lock_stat_data *iter_end; | |
411 | struct lock_stat_data stats[MAX_LOCKDEP_KEYS]; | |
412 | }; | |
413 | ||
414 | /* | |
415 | * sort on absolute number of contentions | |
416 | */ | |
417 | static int lock_stat_cmp(const void *l, const void *r) | |
418 | { | |
419 | const struct lock_stat_data *dl = l, *dr = r; | |
420 | unsigned long nl, nr; | |
421 | ||
422 | nl = dl->stats.read_waittime.nr + dl->stats.write_waittime.nr; | |
423 | nr = dr->stats.read_waittime.nr + dr->stats.write_waittime.nr; | |
424 | ||
425 | return nr - nl; | |
426 | } | |
427 | ||
428 | static void seq_line(struct seq_file *m, char c, int offset, int length) | |
429 | { | |
430 | int i; | |
431 | ||
432 | for (i = 0; i < offset; i++) | |
433 | seq_puts(m, " "); | |
434 | for (i = 0; i < length; i++) | |
435 | seq_printf(m, "%c", c); | |
436 | seq_puts(m, "\n"); | |
437 | } | |
438 | ||
439 | static void snprint_time(char *buf, size_t bufsiz, s64 nr) | |
440 | { | |
6918bc5c PZ |
441 | s64 div; |
442 | s32 rem; | |
c46261de | 443 | |
2189459d | 444 | nr += 5; /* for display rounding */ |
6918bc5c PZ |
445 | div = div_s64_rem(nr, 1000, &rem); |
446 | snprintf(buf, bufsiz, "%lld.%02d", (long long)div, (int)rem/10); | |
c46261de PZ |
447 | } |
448 | ||
449 | static void seq_time(struct seq_file *m, s64 time) | |
450 | { | |
451 | char num[15]; | |
452 | ||
453 | snprint_time(num, sizeof(num), time); | |
454 | seq_printf(m, " %14s", num); | |
455 | } | |
456 | ||
457 | static void seq_lock_time(struct seq_file *m, struct lock_time *lt) | |
458 | { | |
459 | seq_printf(m, "%14lu", lt->nr); | |
460 | seq_time(m, lt->min); | |
461 | seq_time(m, lt->max); | |
462 | seq_time(m, lt->total); | |
463 | } | |
464 | ||
465 | static void seq_stats(struct seq_file *m, struct lock_stat_data *data) | |
466 | { | |
467 | char name[39]; | |
468 | struct lock_class *class; | |
469 | struct lock_class_stats *stats; | |
470 | int i, namelen; | |
471 | ||
472 | class = data->class; | |
473 | stats = &data->stats; | |
474 | ||
d38e1d5a PZ |
475 | namelen = 38; |
476 | if (class->name_version > 1) | |
477 | namelen -= 2; /* XXX truncates versions > 9 */ | |
478 | if (class->subclass) | |
479 | namelen -= 2; | |
480 | ||
481 | if (!class->name) { | |
482 | char str[KSYM_NAME_LEN]; | |
483 | const char *key_name; | |
484 | ||
485 | key_name = __get_key_name(class->key, str); | |
486 | snprintf(name, namelen, "%s", key_name); | |
487 | } else { | |
488 | snprintf(name, namelen, "%s", class->name); | |
489 | } | |
c46261de | 490 | namelen = strlen(name); |
d38e1d5a PZ |
491 | if (class->name_version > 1) { |
492 | snprintf(name+namelen, 3, "#%d", class->name_version); | |
493 | namelen += 2; | |
494 | } | |
495 | if (class->subclass) { | |
496 | snprintf(name+namelen, 3, "/%d", class->subclass); | |
497 | namelen += 2; | |
498 | } | |
c46261de PZ |
499 | |
500 | if (stats->write_holdtime.nr) { | |
501 | if (stats->read_holdtime.nr) | |
502 | seq_printf(m, "%38s-W:", name); | |
503 | else | |
504 | seq_printf(m, "%40s:", name); | |
505 | ||
96645678 | 506 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_write]); |
c46261de | 507 | seq_lock_time(m, &stats->write_waittime); |
96645678 | 508 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_write]); |
c46261de PZ |
509 | seq_lock_time(m, &stats->write_holdtime); |
510 | seq_puts(m, "\n"); | |
511 | } | |
512 | ||
513 | if (stats->read_holdtime.nr) { | |
514 | seq_printf(m, "%38s-R:", name); | |
96645678 | 515 | seq_printf(m, "%14lu ", stats->bounces[bounce_contended_read]); |
c46261de | 516 | seq_lock_time(m, &stats->read_waittime); |
96645678 | 517 | seq_printf(m, " %14lu ", stats->bounces[bounce_acquired_read]); |
c46261de PZ |
518 | seq_lock_time(m, &stats->read_holdtime); |
519 | seq_puts(m, "\n"); | |
520 | } | |
521 | ||
522 | if (stats->read_waittime.nr + stats->write_waittime.nr == 0) | |
523 | return; | |
524 | ||
525 | if (stats->read_holdtime.nr) | |
526 | namelen += 2; | |
527 | ||
c7e78cff | 528 | for (i = 0; i < LOCKSTAT_POINTS; i++) { |
c46261de PZ |
529 | char sym[KSYM_SYMBOL_LEN]; |
530 | char ip[32]; | |
531 | ||
532 | if (class->contention_point[i] == 0) | |
533 | break; | |
534 | ||
535 | if (!i) | |
536 | seq_line(m, '-', 40-namelen, namelen); | |
537 | ||
538 | sprint_symbol(sym, class->contention_point[i]); | |
539 | snprintf(ip, sizeof(ip), "[<%p>]", | |
540 | (void *)class->contention_point[i]); | |
541 | seq_printf(m, "%40s %14lu %29s %s\n", name, | |
542 | stats->contention_point[i], | |
543 | ip, sym); | |
544 | } | |
c7e78cff PZ |
545 | for (i = 0; i < LOCKSTAT_POINTS; i++) { |
546 | char sym[KSYM_SYMBOL_LEN]; | |
547 | char ip[32]; | |
548 | ||
549 | if (class->contending_point[i] == 0) | |
550 | break; | |
551 | ||
552 | if (!i) | |
553 | seq_line(m, '-', 40-namelen, namelen); | |
554 | ||
555 | sprint_symbol(sym, class->contending_point[i]); | |
556 | snprintf(ip, sizeof(ip), "[<%p>]", | |
557 | (void *)class->contending_point[i]); | |
558 | seq_printf(m, "%40s %14lu %29s %s\n", name, | |
559 | stats->contending_point[i], | |
560 | ip, sym); | |
561 | } | |
c46261de PZ |
562 | if (i) { |
563 | seq_puts(m, "\n"); | |
96645678 | 564 | seq_line(m, '.', 0, 40 + 1 + 10 * (14 + 1)); |
c46261de PZ |
565 | seq_puts(m, "\n"); |
566 | } | |
567 | } | |
568 | ||
569 | static void seq_header(struct seq_file *m) | |
570 | { | |
c7e78cff | 571 | seq_printf(m, "lock_stat version 0.3\n"); |
9833f8cb PZ |
572 | |
573 | if (unlikely(!debug_locks)) | |
574 | seq_printf(m, "*WARNING* lock debugging disabled!! - possibly due to a lockdep warning\n"); | |
575 | ||
96645678 PZ |
576 | seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); |
577 | seq_printf(m, "%40s %14s %14s %14s %14s %14s %14s %14s %14s " | |
578 | "%14s %14s\n", | |
c46261de | 579 | "class name", |
96645678 | 580 | "con-bounces", |
c46261de PZ |
581 | "contentions", |
582 | "waittime-min", | |
583 | "waittime-max", | |
584 | "waittime-total", | |
96645678 | 585 | "acq-bounces", |
c46261de PZ |
586 | "acquisitions", |
587 | "holdtime-min", | |
588 | "holdtime-max", | |
589 | "holdtime-total"); | |
96645678 | 590 | seq_line(m, '-', 0, 40 + 1 + 10 * (14 + 1)); |
c46261de PZ |
591 | seq_printf(m, "\n"); |
592 | } | |
593 | ||
594 | static void *ls_start(struct seq_file *m, loff_t *pos) | |
595 | { | |
596 | struct lock_stat_seq *data = m->private; | |
597 | ||
94c61c0a TP |
598 | if (*pos == 0) |
599 | return SEQ_START_TOKEN; | |
c46261de | 600 | |
21227434 | 601 | data->iter = data->stats + (*pos - 1); |
94c61c0a | 602 | if (data->iter >= data->iter_end) |
4b32d0a4 PZ |
603 | data->iter = NULL; |
604 | ||
c46261de PZ |
605 | return data->iter; |
606 | } | |
607 | ||
608 | static void *ls_next(struct seq_file *m, void *v, loff_t *pos) | |
609 | { | |
610 | struct lock_stat_seq *data = m->private; | |
611 | ||
612 | (*pos)++; | |
613 | ||
94c61c0a TP |
614 | if (v == SEQ_START_TOKEN) |
615 | data->iter = data->stats; | |
616 | else { | |
617 | data->iter = v; | |
618 | data->iter++; | |
619 | } | |
620 | ||
c46261de PZ |
621 | if (data->iter == data->iter_end) |
622 | data->iter = NULL; | |
623 | ||
624 | return data->iter; | |
625 | } | |
626 | ||
627 | static void ls_stop(struct seq_file *m, void *v) | |
628 | { | |
629 | } | |
630 | ||
631 | static int ls_show(struct seq_file *m, void *v) | |
632 | { | |
94c61c0a TP |
633 | if (v == SEQ_START_TOKEN) |
634 | seq_header(m); | |
635 | else | |
636 | seq_stats(m, v); | |
c46261de | 637 | |
c46261de PZ |
638 | return 0; |
639 | } | |
640 | ||
641 | static struct seq_operations lockstat_ops = { | |
642 | .start = ls_start, | |
643 | .next = ls_next, | |
644 | .stop = ls_stop, | |
645 | .show = ls_show, | |
646 | }; | |
647 | ||
648 | static int lock_stat_open(struct inode *inode, struct file *file) | |
649 | { | |
650 | int res; | |
651 | struct lock_class *class; | |
652 | struct lock_stat_seq *data = vmalloc(sizeof(struct lock_stat_seq)); | |
653 | ||
654 | if (!data) | |
655 | return -ENOMEM; | |
656 | ||
657 | res = seq_open(file, &lockstat_ops); | |
658 | if (!res) { | |
659 | struct lock_stat_data *iter = data->stats; | |
660 | struct seq_file *m = file->private_data; | |
661 | ||
662 | data->iter = iter; | |
663 | list_for_each_entry(class, &all_lock_classes, lock_entry) { | |
664 | iter->class = class; | |
665 | iter->stats = lock_stats(class); | |
666 | iter++; | |
667 | } | |
668 | data->iter_end = iter; | |
669 | ||
670 | sort(data->stats, data->iter_end - data->iter, | |
671 | sizeof(struct lock_stat_data), | |
672 | lock_stat_cmp, NULL); | |
673 | ||
674 | m->private = data; | |
675 | } else | |
676 | vfree(data); | |
677 | ||
678 | return res; | |
679 | } | |
680 | ||
681 | static ssize_t lock_stat_write(struct file *file, const char __user *buf, | |
682 | size_t count, loff_t *ppos) | |
683 | { | |
684 | struct lock_class *class; | |
685 | char c; | |
686 | ||
687 | if (count) { | |
688 | if (get_user(c, buf)) | |
689 | return -EFAULT; | |
690 | ||
691 | if (c != '0') | |
692 | return count; | |
693 | ||
694 | list_for_each_entry(class, &all_lock_classes, lock_entry) | |
695 | clear_lock_stats(class); | |
696 | } | |
697 | return count; | |
698 | } | |
699 | ||
700 | static int lock_stat_release(struct inode *inode, struct file *file) | |
701 | { | |
702 | struct seq_file *seq = file->private_data; | |
703 | ||
704 | vfree(seq->private); | |
705 | seq->private = NULL; | |
706 | return seq_release(inode, file); | |
707 | } | |
708 | ||
709 | static const struct file_operations proc_lock_stat_operations = { | |
710 | .open = lock_stat_open, | |
711 | .write = lock_stat_write, | |
712 | .read = seq_read, | |
713 | .llseek = seq_lseek, | |
714 | .release = lock_stat_release, | |
715 | }; | |
716 | #endif /* CONFIG_LOCK_STAT */ | |
717 | ||
a8f24a39 IM |
718 | static int __init lockdep_proc_init(void) |
719 | { | |
c33fff0a | 720 | proc_create("lockdep", S_IRUSR, NULL, &proc_lockdep_operations); |
cd1a28e8 | 721 | #ifdef CONFIG_PROVE_LOCKING |
443cd507 HY |
722 | proc_create("lockdep_chains", S_IRUSR, NULL, |
723 | &proc_lockdep_chains_operations); | |
cd1a28e8 | 724 | #endif |
c33fff0a DL |
725 | proc_create("lockdep_stats", S_IRUSR, NULL, |
726 | &proc_lockdep_stats_operations); | |
a8f24a39 | 727 | |
c46261de | 728 | #ifdef CONFIG_LOCK_STAT |
c33fff0a | 729 | proc_create("lock_stat", S_IRUSR, NULL, &proc_lock_stat_operations); |
c46261de PZ |
730 | #endif |
731 | ||
a8f24a39 IM |
732 | return 0; |
733 | } | |
734 | ||
735 | __initcall(lockdep_proc_init); | |
736 |