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1 | /* | |
2 | * Read-Copy Update tracing for classic implementation | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
18 | * Copyright IBM Corporation, 2008 | |
19 | * | |
20 | * Papers: http://www.rdrop.com/users/paulmck/RCU | |
21 | * | |
22 | * For detailed explanation of Read-Copy Update mechanism see - | |
23 | * Documentation/RCU | |
24 | * | |
25 | */ | |
26 | #include <linux/types.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/smp.h> | |
31 | #include <linux/rcupdate.h> | |
32 | #include <linux/interrupt.h> | |
33 | #include <linux/sched.h> | |
34 | #include <linux/atomic.h> | |
35 | #include <linux/bitops.h> | |
36 | #include <linux/module.h> | |
37 | #include <linux/completion.h> | |
38 | #include <linux/moduleparam.h> | |
39 | #include <linux/percpu.h> | |
40 | #include <linux/notifier.h> | |
41 | #include <linux/cpu.h> | |
42 | #include <linux/mutex.h> | |
43 | #include <linux/debugfs.h> | |
44 | #include <linux/seq_file.h> | |
45 | ||
46 | #define RCU_TREE_NONCORE | |
47 | #include "rcutree.h" | |
48 | ||
49 | static int r_open(struct inode *inode, struct file *file, | |
50 | const struct seq_operations *op) | |
51 | { | |
52 | int ret = seq_open(file, op); | |
53 | if (!ret) { | |
54 | struct seq_file *m = (struct seq_file *)file->private_data; | |
55 | m->private = inode->i_private; | |
56 | } | |
57 | return ret; | |
58 | } | |
59 | ||
60 | static void *r_start(struct seq_file *m, loff_t *pos) | |
61 | { | |
62 | struct rcu_state *rsp = (struct rcu_state *)m->private; | |
63 | *pos = cpumask_next(*pos - 1, cpu_possible_mask); | |
64 | if ((*pos) < nr_cpu_ids) | |
65 | return per_cpu_ptr(rsp->rda, *pos); | |
66 | return NULL; | |
67 | } | |
68 | ||
69 | static void *r_next(struct seq_file *m, void *v, loff_t *pos) | |
70 | { | |
71 | (*pos)++; | |
72 | return r_start(m, pos); | |
73 | } | |
74 | ||
75 | static void r_stop(struct seq_file *m, void *v) | |
76 | { | |
77 | } | |
78 | ||
79 | static int show_rcubarrier(struct seq_file *m, void *unused) | |
80 | { | |
81 | struct rcu_state *rsp; | |
82 | ||
83 | for_each_rcu_flavor(rsp) | |
84 | seq_printf(m, "%s: bcc: %d nbd: %lu\n", | |
85 | rsp->name, | |
86 | atomic_read(&rsp->barrier_cpu_count), | |
87 | rsp->n_barrier_done); | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static int rcubarrier_open(struct inode *inode, struct file *file) | |
92 | { | |
93 | return single_open(file, show_rcubarrier, NULL); | |
94 | } | |
95 | ||
96 | static const struct file_operations rcubarrier_fops = { | |
97 | .owner = THIS_MODULE, | |
98 | .open = rcubarrier_open, | |
99 | .read = seq_read, | |
100 | .llseek = seq_lseek, | |
101 | .release = single_release, | |
102 | }; | |
103 | ||
104 | #ifdef CONFIG_RCU_BOOST | |
105 | ||
106 | static char convert_kthread_status(unsigned int kthread_status) | |
107 | { | |
108 | if (kthread_status > RCU_KTHREAD_MAX) | |
109 | return '?'; | |
110 | return "SRWOY"[kthread_status]; | |
111 | } | |
112 | ||
113 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
114 | ||
115 | static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp) | |
116 | { | |
117 | if (!rdp->beenonline) | |
118 | return; | |
119 | seq_printf(m, "%3d%cc=%lu g=%lu pq=%d qp=%d", | |
120 | rdp->cpu, | |
121 | cpu_is_offline(rdp->cpu) ? '!' : ' ', | |
122 | rdp->completed, rdp->gpnum, | |
123 | rdp->passed_quiesce, rdp->qs_pending); | |
124 | seq_printf(m, " dt=%d/%llx/%d df=%lu", | |
125 | atomic_read(&rdp->dynticks->dynticks), | |
126 | rdp->dynticks->dynticks_nesting, | |
127 | rdp->dynticks->dynticks_nmi_nesting, | |
128 | rdp->dynticks_fqs); | |
129 | seq_printf(m, " of=%lu", rdp->offline_fqs); | |
130 | seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c", | |
131 | rdp->qlen_lazy, rdp->qlen, | |
132 | ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] != | |
133 | rdp->nxttail[RCU_NEXT_TAIL]], | |
134 | ".R"[rdp->nxttail[RCU_WAIT_TAIL] != | |
135 | rdp->nxttail[RCU_NEXT_READY_TAIL]], | |
136 | ".W"[rdp->nxttail[RCU_DONE_TAIL] != | |
137 | rdp->nxttail[RCU_WAIT_TAIL]], | |
138 | ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]); | |
139 | #ifdef CONFIG_RCU_BOOST | |
140 | seq_printf(m, " kt=%d/%c ktl=%x", | |
141 | per_cpu(rcu_cpu_has_work, rdp->cpu), | |
142 | convert_kthread_status(per_cpu(rcu_cpu_kthread_status, | |
143 | rdp->cpu)), | |
144 | per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff); | |
145 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
146 | seq_printf(m, " b=%ld", rdp->blimit); | |
147 | seq_printf(m, " ci=%lu co=%lu ca=%lu\n", | |
148 | rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted); | |
149 | } | |
150 | ||
151 | static int show_rcudata(struct seq_file *m, void *unused) | |
152 | { | |
153 | int cpu; | |
154 | struct rcu_state *rsp; | |
155 | ||
156 | for_each_rcu_flavor(rsp) { | |
157 | seq_printf(m, "%s:\n", rsp->name); | |
158 | for_each_possible_cpu(cpu) | |
159 | print_one_rcu_data(m, per_cpu_ptr(rsp->rda, cpu)); | |
160 | } | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static int rcudata_open(struct inode *inode, struct file *file) | |
165 | { | |
166 | return single_open(file, show_rcudata, NULL); | |
167 | } | |
168 | ||
169 | static const struct file_operations rcudata_fops = { | |
170 | .owner = THIS_MODULE, | |
171 | .open = rcudata_open, | |
172 | .read = seq_read, | |
173 | .llseek = seq_lseek, | |
174 | .release = single_release, | |
175 | }; | |
176 | ||
177 | static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp) | |
178 | { | |
179 | if (!rdp->beenonline) | |
180 | return; | |
181 | seq_printf(m, "%d,%s,%lu,%lu,%d,%d", | |
182 | rdp->cpu, | |
183 | cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"", | |
184 | rdp->completed, rdp->gpnum, | |
185 | rdp->passed_quiesce, rdp->qs_pending); | |
186 | seq_printf(m, ",%d,%llx,%d,%lu", | |
187 | atomic_read(&rdp->dynticks->dynticks), | |
188 | rdp->dynticks->dynticks_nesting, | |
189 | rdp->dynticks->dynticks_nmi_nesting, | |
190 | rdp->dynticks_fqs); | |
191 | seq_printf(m, ",%lu", rdp->offline_fqs); | |
192 | seq_printf(m, ",%ld,%ld,\"%c%c%c%c\"", rdp->qlen_lazy, rdp->qlen, | |
193 | ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] != | |
194 | rdp->nxttail[RCU_NEXT_TAIL]], | |
195 | ".R"[rdp->nxttail[RCU_WAIT_TAIL] != | |
196 | rdp->nxttail[RCU_NEXT_READY_TAIL]], | |
197 | ".W"[rdp->nxttail[RCU_DONE_TAIL] != | |
198 | rdp->nxttail[RCU_WAIT_TAIL]], | |
199 | ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]); | |
200 | #ifdef CONFIG_RCU_BOOST | |
201 | seq_printf(m, ",%d,\"%c\"", | |
202 | per_cpu(rcu_cpu_has_work, rdp->cpu), | |
203 | convert_kthread_status(per_cpu(rcu_cpu_kthread_status, | |
204 | rdp->cpu))); | |
205 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
206 | seq_printf(m, ",%ld", rdp->blimit); | |
207 | seq_printf(m, ",%lu,%lu,%lu\n", | |
208 | rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted); | |
209 | } | |
210 | ||
211 | static int show_rcudata_csv(struct seq_file *m, void *unused) | |
212 | { | |
213 | int cpu; | |
214 | struct rcu_state *rsp; | |
215 | ||
216 | seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pq\","); | |
217 | seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\","); | |
218 | seq_puts(m, "\"of\",\"qll\",\"ql\",\"qs\""); | |
219 | #ifdef CONFIG_RCU_BOOST | |
220 | seq_puts(m, "\"kt\",\"ktl\""); | |
221 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
222 | seq_puts(m, ",\"b\",\"ci\",\"co\",\"ca\"\n"); | |
223 | for_each_rcu_flavor(rsp) { | |
224 | seq_printf(m, "\"%s:\"\n", rsp->name); | |
225 | for_each_possible_cpu(cpu) | |
226 | print_one_rcu_data_csv(m, per_cpu_ptr(rsp->rda, cpu)); | |
227 | } | |
228 | return 0; | |
229 | } | |
230 | ||
231 | static int rcudata_csv_open(struct inode *inode, struct file *file) | |
232 | { | |
233 | return single_open(file, show_rcudata_csv, NULL); | |
234 | } | |
235 | ||
236 | static const struct file_operations rcudata_csv_fops = { | |
237 | .owner = THIS_MODULE, | |
238 | .open = rcudata_csv_open, | |
239 | .read = seq_read, | |
240 | .llseek = seq_lseek, | |
241 | .release = single_release, | |
242 | }; | |
243 | ||
244 | #ifdef CONFIG_RCU_BOOST | |
245 | ||
246 | static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp) | |
247 | { | |
248 | seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ", | |
249 | rnp->grplo, rnp->grphi, | |
250 | "T."[list_empty(&rnp->blkd_tasks)], | |
251 | "N."[!rnp->gp_tasks], | |
252 | "E."[!rnp->exp_tasks], | |
253 | "B."[!rnp->boost_tasks], | |
254 | convert_kthread_status(rnp->boost_kthread_status), | |
255 | rnp->n_tasks_boosted, rnp->n_exp_boosts, | |
256 | rnp->n_normal_boosts); | |
257 | seq_printf(m, "j=%04x bt=%04x\n", | |
258 | (int)(jiffies & 0xffff), | |
259 | (int)(rnp->boost_time & 0xffff)); | |
260 | seq_printf(m, " balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n", | |
261 | rnp->n_balk_blkd_tasks, | |
262 | rnp->n_balk_exp_gp_tasks, | |
263 | rnp->n_balk_boost_tasks, | |
264 | rnp->n_balk_notblocked, | |
265 | rnp->n_balk_notyet, | |
266 | rnp->n_balk_nos); | |
267 | } | |
268 | ||
269 | static int show_rcu_node_boost(struct seq_file *m, void *unused) | |
270 | { | |
271 | struct rcu_node *rnp; | |
272 | ||
273 | rcu_for_each_leaf_node(&rcu_preempt_state, rnp) | |
274 | print_one_rcu_node_boost(m, rnp); | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static int rcu_node_boost_open(struct inode *inode, struct file *file) | |
279 | { | |
280 | return single_open(file, show_rcu_node_boost, NULL); | |
281 | } | |
282 | ||
283 | static const struct file_operations rcu_node_boost_fops = { | |
284 | .owner = THIS_MODULE, | |
285 | .open = rcu_node_boost_open, | |
286 | .read = seq_read, | |
287 | .llseek = seq_lseek, | |
288 | .release = single_release, | |
289 | }; | |
290 | ||
291 | /* | |
292 | * Create the rcuboost debugfs entry. Standard error return. | |
293 | */ | |
294 | static int rcu_boost_trace_create_file(struct dentry *rcudir) | |
295 | { | |
296 | return !debugfs_create_file("rcuboost", 0444, rcudir, NULL, | |
297 | &rcu_node_boost_fops); | |
298 | } | |
299 | ||
300 | #else /* #ifdef CONFIG_RCU_BOOST */ | |
301 | ||
302 | static int rcu_boost_trace_create_file(struct dentry *rcudir) | |
303 | { | |
304 | return 0; /* There cannot be an error if we didn't create it! */ | |
305 | } | |
306 | ||
307 | #endif /* #else #ifdef CONFIG_RCU_BOOST */ | |
308 | ||
309 | static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp) | |
310 | { | |
311 | unsigned long gpnum; | |
312 | int level = 0; | |
313 | struct rcu_node *rnp; | |
314 | ||
315 | gpnum = rsp->gpnum; | |
316 | seq_printf(m, "%s: c=%lu g=%lu s=%d jfq=%ld j=%x ", | |
317 | rsp->name, rsp->completed, gpnum, rsp->fqs_state, | |
318 | (long)(rsp->jiffies_force_qs - jiffies), | |
319 | (int)(jiffies & 0xffff)); | |
320 | seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n", | |
321 | rsp->n_force_qs, rsp->n_force_qs_ngp, | |
322 | rsp->n_force_qs - rsp->n_force_qs_ngp, | |
323 | rsp->n_force_qs_lh, rsp->qlen_lazy, rsp->qlen); | |
324 | for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) { | |
325 | if (rnp->level != level) { | |
326 | seq_puts(m, "\n"); | |
327 | level = rnp->level; | |
328 | } | |
329 | seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ", | |
330 | rnp->qsmask, rnp->qsmaskinit, | |
331 | ".G"[rnp->gp_tasks != NULL], | |
332 | ".E"[rnp->exp_tasks != NULL], | |
333 | ".T"[!list_empty(&rnp->blkd_tasks)], | |
334 | rnp->grplo, rnp->grphi, rnp->grpnum); | |
335 | } | |
336 | seq_puts(m, "\n"); | |
337 | } | |
338 | ||
339 | static int show_rcuhier(struct seq_file *m, void *unused) | |
340 | { | |
341 | struct rcu_state *rsp; | |
342 | ||
343 | for_each_rcu_flavor(rsp) | |
344 | print_one_rcu_state(m, rsp); | |
345 | return 0; | |
346 | } | |
347 | ||
348 | static int rcuhier_open(struct inode *inode, struct file *file) | |
349 | { | |
350 | return single_open(file, show_rcuhier, NULL); | |
351 | } | |
352 | ||
353 | static const struct file_operations rcuhier_fops = { | |
354 | .owner = THIS_MODULE, | |
355 | .open = rcuhier_open, | |
356 | .read = seq_read, | |
357 | .llseek = seq_lseek, | |
358 | .release = single_release, | |
359 | }; | |
360 | ||
361 | static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp) | |
362 | { | |
363 | unsigned long flags; | |
364 | unsigned long completed; | |
365 | unsigned long gpnum; | |
366 | unsigned long gpage; | |
367 | unsigned long gpmax; | |
368 | struct rcu_node *rnp = &rsp->node[0]; | |
369 | ||
370 | raw_spin_lock_irqsave(&rnp->lock, flags); | |
371 | completed = rsp->completed; | |
372 | gpnum = rsp->gpnum; | |
373 | if (rsp->completed == rsp->gpnum) | |
374 | gpage = 0; | |
375 | else | |
376 | gpage = jiffies - rsp->gp_start; | |
377 | gpmax = rsp->gp_max; | |
378 | raw_spin_unlock_irqrestore(&rnp->lock, flags); | |
379 | seq_printf(m, "%s: completed=%ld gpnum=%lu age=%ld max=%ld\n", | |
380 | rsp->name, completed, gpnum, gpage, gpmax); | |
381 | } | |
382 | ||
383 | static int show_rcugp(struct seq_file *m, void *unused) | |
384 | { | |
385 | struct rcu_state *rsp; | |
386 | ||
387 | for_each_rcu_flavor(rsp) | |
388 | show_one_rcugp(m, rsp); | |
389 | return 0; | |
390 | } | |
391 | ||
392 | static int rcugp_open(struct inode *inode, struct file *file) | |
393 | { | |
394 | return single_open(file, show_rcugp, NULL); | |
395 | } | |
396 | ||
397 | static const struct file_operations rcugp_fops = { | |
398 | .owner = THIS_MODULE, | |
399 | .open = rcugp_open, | |
400 | .read = seq_read, | |
401 | .llseek = seq_lseek, | |
402 | .release = single_release, | |
403 | }; | |
404 | ||
405 | static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp) | |
406 | { | |
407 | seq_printf(m, "%3d%cnp=%ld ", | |
408 | rdp->cpu, | |
409 | cpu_is_offline(rdp->cpu) ? '!' : ' ', | |
410 | rdp->n_rcu_pending); | |
411 | seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ", | |
412 | rdp->n_rp_qs_pending, | |
413 | rdp->n_rp_report_qs, | |
414 | rdp->n_rp_cb_ready, | |
415 | rdp->n_rp_cpu_needs_gp); | |
416 | seq_printf(m, "gpc=%ld gps=%ld nn=%ld\n", | |
417 | rdp->n_rp_gp_completed, | |
418 | rdp->n_rp_gp_started, | |
419 | rdp->n_rp_need_nothing); | |
420 | } | |
421 | ||
422 | static int show_rcu_pending(struct seq_file *m, void *unused) | |
423 | { | |
424 | int cpu; | |
425 | struct rcu_data *rdp; | |
426 | struct rcu_state *rsp; | |
427 | ||
428 | for_each_rcu_flavor(rsp) { | |
429 | seq_printf(m, "%s:\n", rsp->name); | |
430 | for_each_possible_cpu(cpu) { | |
431 | rdp = per_cpu_ptr(rsp->rda, cpu); | |
432 | if (rdp->beenonline) | |
433 | print_one_rcu_pending(m, rdp); | |
434 | } | |
435 | } | |
436 | return 0; | |
437 | } | |
438 | ||
439 | static int rcu_pending_open(struct inode *inode, struct file *file) | |
440 | { | |
441 | return single_open(file, show_rcu_pending, NULL); | |
442 | } | |
443 | ||
444 | static const struct file_operations rcu_pending_fops = { | |
445 | .owner = THIS_MODULE, | |
446 | .open = rcu_pending_open, | |
447 | .read = seq_read, | |
448 | .llseek = seq_lseek, | |
449 | .release = single_release, | |
450 | }; | |
451 | ||
452 | static int show_rcutorture(struct seq_file *m, void *unused) | |
453 | { | |
454 | seq_printf(m, "rcutorture test sequence: %lu %s\n", | |
455 | rcutorture_testseq >> 1, | |
456 | (rcutorture_testseq & 0x1) ? "(test in progress)" : ""); | |
457 | seq_printf(m, "rcutorture update version number: %lu\n", | |
458 | rcutorture_vernum); | |
459 | return 0; | |
460 | } | |
461 | ||
462 | static int rcutorture_open(struct inode *inode, struct file *file) | |
463 | { | |
464 | return single_open(file, show_rcutorture, NULL); | |
465 | } | |
466 | ||
467 | static const struct file_operations rcutorture_fops = { | |
468 | .owner = THIS_MODULE, | |
469 | .open = rcutorture_open, | |
470 | .read = seq_read, | |
471 | .llseek = seq_lseek, | |
472 | .release = single_release, | |
473 | }; | |
474 | ||
475 | static struct dentry *rcudir; | |
476 | ||
477 | static int __init rcutree_trace_init(void) | |
478 | { | |
479 | struct rcu_state *rsp; | |
480 | struct dentry *retval; | |
481 | struct dentry *rspdir; | |
482 | ||
483 | rcudir = debugfs_create_dir("rcu", NULL); | |
484 | if (!rcudir) | |
485 | goto free_out; | |
486 | ||
487 | for_each_rcu_flavor(rsp) { | |
488 | rspdir = debugfs_create_dir(rsp->name, rcudir); | |
489 | if (!rspdir) | |
490 | goto free_out; | |
491 | } | |
492 | ||
493 | retval = debugfs_create_file("rcubarrier", 0444, rcudir, | |
494 | NULL, &rcubarrier_fops); | |
495 | if (!retval) | |
496 | goto free_out; | |
497 | ||
498 | retval = debugfs_create_file("rcudata", 0444, rcudir, | |
499 | NULL, &rcudata_fops); | |
500 | if (!retval) | |
501 | goto free_out; | |
502 | ||
503 | retval = debugfs_create_file("rcudata.csv", 0444, rcudir, | |
504 | NULL, &rcudata_csv_fops); | |
505 | if (!retval) | |
506 | goto free_out; | |
507 | ||
508 | if (rcu_boost_trace_create_file(rcudir)) | |
509 | goto free_out; | |
510 | ||
511 | retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops); | |
512 | if (!retval) | |
513 | goto free_out; | |
514 | ||
515 | retval = debugfs_create_file("rcuhier", 0444, rcudir, | |
516 | NULL, &rcuhier_fops); | |
517 | if (!retval) | |
518 | goto free_out; | |
519 | ||
520 | retval = debugfs_create_file("rcu_pending", 0444, rcudir, | |
521 | NULL, &rcu_pending_fops); | |
522 | if (!retval) | |
523 | goto free_out; | |
524 | ||
525 | retval = debugfs_create_file("rcutorture", 0444, rcudir, | |
526 | NULL, &rcutorture_fops); | |
527 | if (!retval) | |
528 | goto free_out; | |
529 | return 0; | |
530 | free_out: | |
531 | debugfs_remove_recursive(rcudir); | |
532 | return 1; | |
533 | } | |
534 | ||
535 | static void __exit rcutree_trace_cleanup(void) | |
536 | { | |
537 | debugfs_remove_recursive(rcudir); | |
538 | } | |
539 | ||
540 | ||
541 | module_init(rcutree_trace_init); | |
542 | module_exit(rcutree_trace_cleanup); | |
543 | ||
544 | MODULE_AUTHOR("Paul E. McKenney"); | |
545 | MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation"); | |
546 | MODULE_LICENSE("GPL"); |