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Source at commit cdde9cf73945d547acd3e96f9508c79e84ad0bf1 created 12 years 9 months ago. By Maarten ter Huurne, MMC: JZ4740: Added support for CPU frequency changing | |
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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 show_rcubarrier(struct seq_file *m, void *unused) |
50 | { |
51 | struct rcu_state *rsp; |
52 | |
53 | for_each_rcu_flavor(rsp) |
54 | seq_printf(m, "%s: %c bcc: %d nbd: %lu\n", |
55 | rsp->name, rsp->rcu_barrier_in_progress ? 'B' : '.', |
56 | atomic_read(&rsp->barrier_cpu_count), |
57 | rsp->n_barrier_done); |
58 | return 0; |
59 | } |
60 | |
61 | static int rcubarrier_open(struct inode *inode, struct file *file) |
62 | { |
63 | return single_open(file, show_rcubarrier, NULL); |
64 | } |
65 | |
66 | static const struct file_operations rcubarrier_fops = { |
67 | .owner = THIS_MODULE, |
68 | .open = rcubarrier_open, |
69 | .read = seq_read, |
70 | .llseek = seq_lseek, |
71 | .release = single_release, |
72 | }; |
73 | |
74 | #ifdef CONFIG_RCU_BOOST |
75 | |
76 | static char convert_kthread_status(unsigned int kthread_status) |
77 | { |
78 | if (kthread_status > RCU_KTHREAD_MAX) |
79 | return '?'; |
80 | return "SRWOY"[kthread_status]; |
81 | } |
82 | |
83 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
84 | |
85 | static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp) |
86 | { |
87 | if (!rdp->beenonline) |
88 | return; |
89 | seq_printf(m, "%3d%cc=%lu g=%lu pq=%d pgp=%lu qp=%d", |
90 | rdp->cpu, |
91 | cpu_is_offline(rdp->cpu) ? '!' : ' ', |
92 | rdp->completed, rdp->gpnum, |
93 | rdp->passed_quiesce, rdp->passed_quiesce_gpnum, |
94 | rdp->qs_pending); |
95 | seq_printf(m, " dt=%d/%llx/%d df=%lu", |
96 | atomic_read(&rdp->dynticks->dynticks), |
97 | rdp->dynticks->dynticks_nesting, |
98 | rdp->dynticks->dynticks_nmi_nesting, |
99 | rdp->dynticks_fqs); |
100 | seq_printf(m, " of=%lu", rdp->offline_fqs); |
101 | seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c", |
102 | rdp->qlen_lazy, rdp->qlen, |
103 | ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] != |
104 | rdp->nxttail[RCU_NEXT_TAIL]], |
105 | ".R"[rdp->nxttail[RCU_WAIT_TAIL] != |
106 | rdp->nxttail[RCU_NEXT_READY_TAIL]], |
107 | ".W"[rdp->nxttail[RCU_DONE_TAIL] != |
108 | rdp->nxttail[RCU_WAIT_TAIL]], |
109 | ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]); |
110 | #ifdef CONFIG_RCU_BOOST |
111 | seq_printf(m, " kt=%d/%c/%d ktl=%x", |
112 | per_cpu(rcu_cpu_has_work, rdp->cpu), |
113 | convert_kthread_status(per_cpu(rcu_cpu_kthread_status, |
114 | rdp->cpu)), |
115 | per_cpu(rcu_cpu_kthread_cpu, rdp->cpu), |
116 | per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff); |
117 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
118 | seq_printf(m, " b=%ld", rdp->blimit); |
119 | seq_printf(m, " ci=%lu co=%lu ca=%lu\n", |
120 | rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted); |
121 | } |
122 | |
123 | static int show_rcudata(struct seq_file *m, void *unused) |
124 | { |
125 | int cpu; |
126 | struct rcu_state *rsp; |
127 | |
128 | for_each_rcu_flavor(rsp) { |
129 | seq_printf(m, "%s:\n", rsp->name); |
130 | for_each_possible_cpu(cpu) |
131 | print_one_rcu_data(m, per_cpu_ptr(rsp->rda, cpu)); |
132 | } |
133 | return 0; |
134 | } |
135 | |
136 | static int rcudata_open(struct inode *inode, struct file *file) |
137 | { |
138 | return single_open(file, show_rcudata, NULL); |
139 | } |
140 | |
141 | static const struct file_operations rcudata_fops = { |
142 | .owner = THIS_MODULE, |
143 | .open = rcudata_open, |
144 | .read = seq_read, |
145 | .llseek = seq_lseek, |
146 | .release = single_release, |
147 | }; |
148 | |
149 | static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp) |
150 | { |
151 | if (!rdp->beenonline) |
152 | return; |
153 | seq_printf(m, "%d,%s,%lu,%lu,%d,%lu,%d", |
154 | rdp->cpu, |
155 | cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"", |
156 | rdp->completed, rdp->gpnum, |
157 | rdp->passed_quiesce, rdp->passed_quiesce_gpnum, |
158 | rdp->qs_pending); |
159 | seq_printf(m, ",%d,%llx,%d,%lu", |
160 | atomic_read(&rdp->dynticks->dynticks), |
161 | rdp->dynticks->dynticks_nesting, |
162 | rdp->dynticks->dynticks_nmi_nesting, |
163 | rdp->dynticks_fqs); |
164 | seq_printf(m, ",%lu", rdp->offline_fqs); |
165 | seq_printf(m, ",%ld,%ld,\"%c%c%c%c\"", rdp->qlen_lazy, rdp->qlen, |
166 | ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] != |
167 | rdp->nxttail[RCU_NEXT_TAIL]], |
168 | ".R"[rdp->nxttail[RCU_WAIT_TAIL] != |
169 | rdp->nxttail[RCU_NEXT_READY_TAIL]], |
170 | ".W"[rdp->nxttail[RCU_DONE_TAIL] != |
171 | rdp->nxttail[RCU_WAIT_TAIL]], |
172 | ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]); |
173 | #ifdef CONFIG_RCU_BOOST |
174 | seq_printf(m, ",%d,\"%c\"", |
175 | per_cpu(rcu_cpu_has_work, rdp->cpu), |
176 | convert_kthread_status(per_cpu(rcu_cpu_kthread_status, |
177 | rdp->cpu))); |
178 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
179 | seq_printf(m, ",%ld", rdp->blimit); |
180 | seq_printf(m, ",%lu,%lu,%lu\n", |
181 | rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted); |
182 | } |
183 | |
184 | static int show_rcudata_csv(struct seq_file *m, void *unused) |
185 | { |
186 | int cpu; |
187 | struct rcu_state *rsp; |
188 | |
189 | seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pgp\",\"pq\","); |
190 | seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\","); |
191 | seq_puts(m, "\"of\",\"qll\",\"ql\",\"qs\""); |
192 | #ifdef CONFIG_RCU_BOOST |
193 | seq_puts(m, "\"kt\",\"ktl\""); |
194 | #endif /* #ifdef CONFIG_RCU_BOOST */ |
195 | seq_puts(m, ",\"b\",\"ci\",\"co\",\"ca\"\n"); |
196 | for_each_rcu_flavor(rsp) { |
197 | seq_printf(m, "\"%s:\"\n", rsp->name); |
198 | for_each_possible_cpu(cpu) |
199 | print_one_rcu_data_csv(m, per_cpu_ptr(rsp->rda, cpu)); |
200 | } |
201 | return 0; |
202 | } |
203 | |
204 | static int rcudata_csv_open(struct inode *inode, struct file *file) |
205 | { |
206 | return single_open(file, show_rcudata_csv, NULL); |
207 | } |
208 | |
209 | static const struct file_operations rcudata_csv_fops = { |
210 | .owner = THIS_MODULE, |
211 | .open = rcudata_csv_open, |
212 | .read = seq_read, |
213 | .llseek = seq_lseek, |
214 | .release = single_release, |
215 | }; |
216 | |
217 | #ifdef CONFIG_RCU_BOOST |
218 | |
219 | static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp) |
220 | { |
221 | seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ", |
222 | rnp->grplo, rnp->grphi, |
223 | "T."[list_empty(&rnp->blkd_tasks)], |
224 | "N."[!rnp->gp_tasks], |
225 | "E."[!rnp->exp_tasks], |
226 | "B."[!rnp->boost_tasks], |
227 | convert_kthread_status(rnp->boost_kthread_status), |
228 | rnp->n_tasks_boosted, rnp->n_exp_boosts, |
229 | rnp->n_normal_boosts); |
230 | seq_printf(m, "j=%04x bt=%04x\n", |
231 | (int)(jiffies & 0xffff), |
232 | (int)(rnp->boost_time & 0xffff)); |
233 | seq_printf(m, " balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n", |
234 | rnp->n_balk_blkd_tasks, |
235 | rnp->n_balk_exp_gp_tasks, |
236 | rnp->n_balk_boost_tasks, |
237 | rnp->n_balk_notblocked, |
238 | rnp->n_balk_notyet, |
239 | rnp->n_balk_nos); |
240 | } |
241 | |
242 | static int show_rcu_node_boost(struct seq_file *m, void *unused) |
243 | { |
244 | struct rcu_node *rnp; |
245 | |
246 | rcu_for_each_leaf_node(&rcu_preempt_state, rnp) |
247 | print_one_rcu_node_boost(m, rnp); |
248 | return 0; |
249 | } |
250 | |
251 | static int rcu_node_boost_open(struct inode *inode, struct file *file) |
252 | { |
253 | return single_open(file, show_rcu_node_boost, NULL); |
254 | } |
255 | |
256 | static const struct file_operations rcu_node_boost_fops = { |
257 | .owner = THIS_MODULE, |
258 | .open = rcu_node_boost_open, |
259 | .read = seq_read, |
260 | .llseek = seq_lseek, |
261 | .release = single_release, |
262 | }; |
263 | |
264 | /* |
265 | * Create the rcuboost debugfs entry. Standard error return. |
266 | */ |
267 | static int rcu_boost_trace_create_file(struct dentry *rcudir) |
268 | { |
269 | return !debugfs_create_file("rcuboost", 0444, rcudir, NULL, |
270 | &rcu_node_boost_fops); |
271 | } |
272 | |
273 | #else /* #ifdef CONFIG_RCU_BOOST */ |
274 | |
275 | static int rcu_boost_trace_create_file(struct dentry *rcudir) |
276 | { |
277 | return 0; /* There cannot be an error if we didn't create it! */ |
278 | } |
279 | |
280 | #endif /* #else #ifdef CONFIG_RCU_BOOST */ |
281 | |
282 | static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp) |
283 | { |
284 | unsigned long gpnum; |
285 | int level = 0; |
286 | struct rcu_node *rnp; |
287 | |
288 | gpnum = rsp->gpnum; |
289 | seq_printf(m, "%s: c=%lu g=%lu s=%d jfq=%ld j=%x ", |
290 | rsp->name, rsp->completed, gpnum, rsp->fqs_state, |
291 | (long)(rsp->jiffies_force_qs - jiffies), |
292 | (int)(jiffies & 0xffff)); |
293 | seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n", |
294 | rsp->n_force_qs, rsp->n_force_qs_ngp, |
295 | rsp->n_force_qs - rsp->n_force_qs_ngp, |
296 | rsp->n_force_qs_lh, rsp->qlen_lazy, rsp->qlen); |
297 | for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) { |
298 | if (rnp->level != level) { |
299 | seq_puts(m, "\n"); |
300 | level = rnp->level; |
301 | } |
302 | seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ", |
303 | rnp->qsmask, rnp->qsmaskinit, |
304 | ".G"[rnp->gp_tasks != NULL], |
305 | ".E"[rnp->exp_tasks != NULL], |
306 | ".T"[!list_empty(&rnp->blkd_tasks)], |
307 | rnp->grplo, rnp->grphi, rnp->grpnum); |
308 | } |
309 | seq_puts(m, "\n"); |
310 | } |
311 | |
312 | static int show_rcuhier(struct seq_file *m, void *unused) |
313 | { |
314 | struct rcu_state *rsp; |
315 | |
316 | for_each_rcu_flavor(rsp) |
317 | print_one_rcu_state(m, rsp); |
318 | return 0; |
319 | } |
320 | |
321 | static int rcuhier_open(struct inode *inode, struct file *file) |
322 | { |
323 | return single_open(file, show_rcuhier, NULL); |
324 | } |
325 | |
326 | static const struct file_operations rcuhier_fops = { |
327 | .owner = THIS_MODULE, |
328 | .open = rcuhier_open, |
329 | .read = seq_read, |
330 | .llseek = seq_lseek, |
331 | .release = single_release, |
332 | }; |
333 | |
334 | static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp) |
335 | { |
336 | unsigned long flags; |
337 | unsigned long completed; |
338 | unsigned long gpnum; |
339 | unsigned long gpage; |
340 | unsigned long gpmax; |
341 | struct rcu_node *rnp = &rsp->node[0]; |
342 | |
343 | raw_spin_lock_irqsave(&rnp->lock, flags); |
344 | completed = rsp->completed; |
345 | gpnum = rsp->gpnum; |
346 | if (rsp->completed == rsp->gpnum) |
347 | gpage = 0; |
348 | else |
349 | gpage = jiffies - rsp->gp_start; |
350 | gpmax = rsp->gp_max; |
351 | raw_spin_unlock_irqrestore(&rnp->lock, flags); |
352 | seq_printf(m, "%s: completed=%ld gpnum=%lu age=%ld max=%ld\n", |
353 | rsp->name, completed, gpnum, gpage, gpmax); |
354 | } |
355 | |
356 | static int show_rcugp(struct seq_file *m, void *unused) |
357 | { |
358 | struct rcu_state *rsp; |
359 | |
360 | for_each_rcu_flavor(rsp) |
361 | show_one_rcugp(m, rsp); |
362 | return 0; |
363 | } |
364 | |
365 | static int rcugp_open(struct inode *inode, struct file *file) |
366 | { |
367 | return single_open(file, show_rcugp, NULL); |
368 | } |
369 | |
370 | static const struct file_operations rcugp_fops = { |
371 | .owner = THIS_MODULE, |
372 | .open = rcugp_open, |
373 | .read = seq_read, |
374 | .llseek = seq_lseek, |
375 | .release = single_release, |
376 | }; |
377 | |
378 | static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp) |
379 | { |
380 | seq_printf(m, "%3d%cnp=%ld ", |
381 | rdp->cpu, |
382 | cpu_is_offline(rdp->cpu) ? '!' : ' ', |
383 | rdp->n_rcu_pending); |
384 | seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ", |
385 | rdp->n_rp_qs_pending, |
386 | rdp->n_rp_report_qs, |
387 | rdp->n_rp_cb_ready, |
388 | rdp->n_rp_cpu_needs_gp); |
389 | seq_printf(m, "gpc=%ld gps=%ld nf=%ld nn=%ld\n", |
390 | rdp->n_rp_gp_completed, |
391 | rdp->n_rp_gp_started, |
392 | rdp->n_rp_need_fqs, |
393 | rdp->n_rp_need_nothing); |
394 | } |
395 | |
396 | static int show_rcu_pending(struct seq_file *m, void *unused) |
397 | { |
398 | int cpu; |
399 | struct rcu_data *rdp; |
400 | struct rcu_state *rsp; |
401 | |
402 | for_each_rcu_flavor(rsp) { |
403 | seq_printf(m, "%s:\n", rsp->name); |
404 | for_each_possible_cpu(cpu) { |
405 | rdp = per_cpu_ptr(rsp->rda, cpu); |
406 | if (rdp->beenonline) |
407 | print_one_rcu_pending(m, rdp); |
408 | } |
409 | } |
410 | return 0; |
411 | } |
412 | |
413 | static int rcu_pending_open(struct inode *inode, struct file *file) |
414 | { |
415 | return single_open(file, show_rcu_pending, NULL); |
416 | } |
417 | |
418 | static const struct file_operations rcu_pending_fops = { |
419 | .owner = THIS_MODULE, |
420 | .open = rcu_pending_open, |
421 | .read = seq_read, |
422 | .llseek = seq_lseek, |
423 | .release = single_release, |
424 | }; |
425 | |
426 | static int show_rcutorture(struct seq_file *m, void *unused) |
427 | { |
428 | seq_printf(m, "rcutorture test sequence: %lu %s\n", |
429 | rcutorture_testseq >> 1, |
430 | (rcutorture_testseq & 0x1) ? "(test in progress)" : ""); |
431 | seq_printf(m, "rcutorture update version number: %lu\n", |
432 | rcutorture_vernum); |
433 | return 0; |
434 | } |
435 | |
436 | static int rcutorture_open(struct inode *inode, struct file *file) |
437 | { |
438 | return single_open(file, show_rcutorture, NULL); |
439 | } |
440 | |
441 | static const struct file_operations rcutorture_fops = { |
442 | .owner = THIS_MODULE, |
443 | .open = rcutorture_open, |
444 | .read = seq_read, |
445 | .llseek = seq_lseek, |
446 | .release = single_release, |
447 | }; |
448 | |
449 | static struct dentry *rcudir; |
450 | |
451 | static int __init rcutree_trace_init(void) |
452 | { |
453 | struct dentry *retval; |
454 | |
455 | rcudir = debugfs_create_dir("rcu", NULL); |
456 | if (!rcudir) |
457 | goto free_out; |
458 | |
459 | retval = debugfs_create_file("rcubarrier", 0444, rcudir, |
460 | NULL, &rcubarrier_fops); |
461 | if (!retval) |
462 | goto free_out; |
463 | |
464 | retval = debugfs_create_file("rcudata", 0444, rcudir, |
465 | NULL, &rcudata_fops); |
466 | if (!retval) |
467 | goto free_out; |
468 | |
469 | retval = debugfs_create_file("rcudata.csv", 0444, rcudir, |
470 | NULL, &rcudata_csv_fops); |
471 | if (!retval) |
472 | goto free_out; |
473 | |
474 | if (rcu_boost_trace_create_file(rcudir)) |
475 | goto free_out; |
476 | |
477 | retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops); |
478 | if (!retval) |
479 | goto free_out; |
480 | |
481 | retval = debugfs_create_file("rcuhier", 0444, rcudir, |
482 | NULL, &rcuhier_fops); |
483 | if (!retval) |
484 | goto free_out; |
485 | |
486 | retval = debugfs_create_file("rcu_pending", 0444, rcudir, |
487 | NULL, &rcu_pending_fops); |
488 | if (!retval) |
489 | goto free_out; |
490 | |
491 | retval = debugfs_create_file("rcutorture", 0444, rcudir, |
492 | NULL, &rcutorture_fops); |
493 | if (!retval) |
494 | goto free_out; |
495 | return 0; |
496 | free_out: |
497 | debugfs_remove_recursive(rcudir); |
498 | return 1; |
499 | } |
500 | |
501 | static void __exit rcutree_trace_cleanup(void) |
502 | { |
503 | debugfs_remove_recursive(rcudir); |
504 | } |
505 | |
506 | |
507 | module_init(rcutree_trace_init); |
508 | module_exit(rcutree_trace_cleanup); |
509 | |
510 | MODULE_AUTHOR("Paul E. McKenney"); |
511 | MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation"); |
512 | MODULE_LICENSE("GPL"); |
513 |
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