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rcu: Add grace-period, quiescent-state, and call_rcu trace events
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / rcutree_trace.c
CommitLineData
64db4cff
PM		 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 -
a71fca58 23 * Documentation/RCU
64db4cff
PM		 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>
60063497 34#include <linux/atomic.h>
64db4cff
PM		 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
9f77da9f 46#define RCU_TREE_NONCORE
6258c4fb
IM		 47#include "rcutree.h"
48
a46e0899
PM		 49#ifdef CONFIG_RCU_BOOST
50
d71df90e
PM		 51static char convert_kthread_status(unsigned int kthread_status)
52{
53 if (kthread_status > RCU_KTHREAD_MAX)
54 return '?';
15ba0ba8 55 return "SRWOY"[kthread_status];
d71df90e
PM		 56}
57
a46e0899
PM		 58#endif /* #ifdef CONFIG_RCU_BOOST */
59
64db4cff
PM		 60static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
61{
62 if (!rdp->beenonline)
63 return;
20133cfc 64 seq_printf(m, "%3d%cc=%lu g=%lu pq=%d pqc=%lu qp=%d",
64db4cff
PM		 65 rdp->cpu,
66 cpu_is_offline(rdp->cpu) ? '!' : ' ',
67 rdp->completed, rdp->gpnum,
68 rdp->passed_quiesc, rdp->passed_quiesc_completed,
ef631b0c 69 rdp->qs_pending);
64db4cff 70#ifdef CONFIG_NO_HZ
23b5c8fa
PM		 71 seq_printf(m, " dt=%d/%d/%d df=%lu",
72 atomic_read(&rdp->dynticks->dynticks),
64db4cff 73 rdp->dynticks->dynticks_nesting,
23b5c8fa 74 rdp->dynticks->dynticks_nmi_nesting,
64db4cff
PM		 75 rdp->dynticks_fqs);
76#endif /* #ifdef CONFIG_NO_HZ */
77 seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi);
a46e0899 78 seq_printf(m, " ql=%ld qs=%c%c%c%c",
0ac3d136
PM		 79 rdp->qlen,
80 ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
81 rdp->nxttail[RCU_NEXT_TAIL]],
82 ".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
83 rdp->nxttail[RCU_NEXT_READY_TAIL]],
84 ".W"[rdp->nxttail[RCU_DONE_TAIL] !=
85 rdp->nxttail[RCU_WAIT_TAIL]],
a46e0899
PM		 86 ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
87#ifdef CONFIG_RCU_BOOST
88 seq_printf(m, " kt=%d/%c/%d ktl=%x",
d71df90e
PM		 89 per_cpu(rcu_cpu_has_work, rdp->cpu),
90 convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
91 rdp->cpu)),
15ba0ba8 92 per_cpu(rcu_cpu_kthread_cpu, rdp->cpu),
a46e0899
PM		 93 per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff);
94#endif /* #ifdef CONFIG_RCU_BOOST */
95 seq_printf(m, " b=%ld", rdp->blimit);
269dcc1c
PM		 96 seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
97 rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
64db4cff
PM		 98}
99
100#define PRINT_RCU_DATA(name, func, m) \
101 do { \
102 int _p_r_d_i; \
103 \
104 for_each_possible_cpu(_p_r_d_i) \
105 func(m, &per_cpu(name, _p_r_d_i)); \
106 } while (0)
107
108static int show_rcudata(struct seq_file *m, void *unused)
109{
f41d911f
PM		 110#ifdef CONFIG_TREE_PREEMPT_RCU
111 seq_puts(m, "rcu_preempt:\n");
112 PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data, m);
113#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
d6714c22
PM		 114 seq_puts(m, "rcu_sched:\n");
115 PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data, m);
64db4cff
PM		 116 seq_puts(m, "rcu_bh:\n");
117 PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
118 return 0;
119}
120
121static int rcudata_open(struct inode *inode, struct file *file)
122{
123 return single_open(file, show_rcudata, NULL);
124}
125
9b2619af 126static const struct file_operations rcudata_fops = {
64db4cff
PM		 127 .owner = THIS_MODULE,
128 .open = rcudata_open,
129 .read = seq_read,
130 .llseek = seq_lseek,
131 .release = single_release,
132};
133
134static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
135{
136 if (!rdp->beenonline)
137 return;
20133cfc 138 seq_printf(m, "%d,%s,%lu,%lu,%d,%lu,%d",
64db4cff 139 rdp->cpu,
5699ed8f 140 cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
64db4cff
PM		 141 rdp->completed, rdp->gpnum,
142 rdp->passed_quiesc, rdp->passed_quiesc_completed,
ef631b0c 143 rdp->qs_pending);
64db4cff
PM		 144#ifdef CONFIG_NO_HZ
145 seq_printf(m, ",%d,%d,%d,%lu",
23b5c8fa 146 atomic_read(&rdp->dynticks->dynticks),
64db4cff 147 rdp->dynticks->dynticks_nesting,
23b5c8fa 148 rdp->dynticks->dynticks_nmi_nesting,
64db4cff
PM		 149 rdp->dynticks_fqs);
150#endif /* #ifdef CONFIG_NO_HZ */
151 seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
a46e0899 152 seq_printf(m, ",%ld,\"%c%c%c%c\"", rdp->qlen,
0ac3d136
PM		 153 ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
154 rdp->nxttail[RCU_NEXT_TAIL]],
155 ".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
156 rdp->nxttail[RCU_NEXT_READY_TAIL]],
157 ".W"[rdp->nxttail[RCU_DONE_TAIL] !=
158 rdp->nxttail[RCU_WAIT_TAIL]],
a46e0899
PM		 159 ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
160#ifdef CONFIG_RCU_BOOST
161 seq_printf(m, ",%d,\"%c\"",
d71df90e
PM		 162 per_cpu(rcu_cpu_has_work, rdp->cpu),
163 convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
a46e0899
PM		 164 rdp->cpu)));
165#endif /* #ifdef CONFIG_RCU_BOOST */
166 seq_printf(m, ",%ld", rdp->blimit);
269dcc1c
PM		 167 seq_printf(m, ",%lu,%lu,%lu\n",
168 rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
64db4cff
PM		 169}
170
171static int show_rcudata_csv(struct seq_file *m, void *unused)
172{
ef631b0c 173 seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\",");
64db4cff 174#ifdef CONFIG_NO_HZ
23b5c8fa 175 seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\",");
64db4cff 176#endif /* #ifdef CONFIG_NO_HZ */
a46e0899
PM		 177 seq_puts(m, "\"of\",\"ri\",\"ql\",\"qs\"");
178#ifdef CONFIG_RCU_BOOST
179 seq_puts(m, "\"kt\",\"ktl\"");
180#endif /* #ifdef CONFIG_RCU_BOOST */
181 seq_puts(m, ",\"b\",\"ci\",\"co\",\"ca\"\n");
f41d911f
PM		 182#ifdef CONFIG_TREE_PREEMPT_RCU
183 seq_puts(m, "\"rcu_preempt:\"\n");
184 PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data_csv, m);
185#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
d6714c22
PM		 186 seq_puts(m, "\"rcu_sched:\"\n");
187 PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data_csv, m);
64db4cff
PM		 188 seq_puts(m, "\"rcu_bh:\"\n");
189 PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
190 return 0;
191}
192
193static int rcudata_csv_open(struct inode *inode, struct file *file)
194{
195 return single_open(file, show_rcudata_csv, NULL);
196}
197
9b2619af 198static const struct file_operations rcudata_csv_fops = {
64db4cff
PM		 199 .owner = THIS_MODULE,
200 .open = rcudata_csv_open,
201 .read = seq_read,
202 .llseek = seq_lseek,
203 .release = single_release,
204};
205
0ea1f2eb
PM		 206#ifdef CONFIG_RCU_BOOST
207
208static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp)
209{
d71df90e 210 seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu "
0ea1f2eb
PM		 211 "j=%04x bt=%04x\n",
212 rnp->grplo, rnp->grphi,
213 "T."[list_empty(&rnp->blkd_tasks)],
214 "N."[!rnp->gp_tasks],
215 "E."[!rnp->exp_tasks],
216 "B."[!rnp->boost_tasks],
d71df90e 217 convert_kthread_status(rnp->boost_kthread_status),
0ea1f2eb
PM		 218 rnp->n_tasks_boosted, rnp->n_exp_boosts,
219 rnp->n_normal_boosts,
220 (int)(jiffies & 0xffff),
221 (int)(rnp->boost_time & 0xffff));
222 seq_printf(m, "%s: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
223 " balk",
224 rnp->n_balk_blkd_tasks,
225 rnp->n_balk_exp_gp_tasks,
226 rnp->n_balk_boost_tasks,
227 rnp->n_balk_notblocked,
228 rnp->n_balk_notyet,
229 rnp->n_balk_nos);
230}
231
232static int show_rcu_node_boost(struct seq_file *m, void *unused)
233{
234 struct rcu_node *rnp;
235
236 rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
237 print_one_rcu_node_boost(m, rnp);
238 return 0;
239}
240
241static int rcu_node_boost_open(struct inode *inode, struct file *file)
242{
243 return single_open(file, show_rcu_node_boost, NULL);
244}
245
246static const struct file_operations rcu_node_boost_fops = {
247 .owner = THIS_MODULE,
248 .open = rcu_node_boost_open,
249 .read = seq_read,
250 .llseek = seq_lseek,
251 .release = single_release,
252};
253
254/*
255 * Create the rcuboost debugfs entry. Standard error return.
256 */
257static int rcu_boost_trace_create_file(struct dentry *rcudir)
258{
259 return !debugfs_create_file("rcuboost", 0444, rcudir, NULL,
260 &rcu_node_boost_fops);
261}
262
263#else /* #ifdef CONFIG_RCU_BOOST */
264
265static int rcu_boost_trace_create_file(struct dentry *rcudir)
266{
267 return 0; /* There cannot be an error if we didn't create it! */
268}
269
270#endif /* #else #ifdef CONFIG_RCU_BOOST */
271
64db4cff
PM		 272static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
273{
20133cfc 274 unsigned long gpnum;
64db4cff
PM		 275 int level = 0;
276 struct rcu_node *rnp;
277
3397e040 278 gpnum = rsp->gpnum;
20133cfc 279 seq_printf(m, "c=%lu g=%lu s=%d jfq=%ld j=%x "
29494be7 280 "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",
3397e040 281 rsp->completed, gpnum, rsp->signaled,
64db4cff
PM		 282 (long)(rsp->jiffies_force_qs - jiffies),
283 (int)(jiffies & 0xffff),
284 rsp->n_force_qs, rsp->n_force_qs_ngp,
285 rsp->n_force_qs - rsp->n_force_qs_ngp,
29494be7 286 rsp->n_force_qs_lh);
64db4cff
PM		 287 for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) {
288 if (rnp->level != level) {
289 seq_puts(m, "\n");
290 level = rnp->level;
291 }
12f5f524 292 seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ",
64db4cff 293 rnp->qsmask, rnp->qsmaskinit,
12f5f524
PM		 294 ".G"[rnp->gp_tasks != NULL],
295 ".E"[rnp->exp_tasks != NULL],
296 ".T"[!list_empty(&rnp->blkd_tasks)],
64db4cff
PM		 297 rnp->grplo, rnp->grphi, rnp->grpnum);
298 }
299 seq_puts(m, "\n");
300}
301
302static int show_rcuhier(struct seq_file *m, void *unused)
303{
f41d911f
PM		 304#ifdef CONFIG_TREE_PREEMPT_RCU
305 seq_puts(m, "rcu_preempt:\n");
306 print_one_rcu_state(m, &rcu_preempt_state);
307#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
d6714c22
PM		 308 seq_puts(m, "rcu_sched:\n");
309 print_one_rcu_state(m, &rcu_sched_state);
64db4cff
PM		 310 seq_puts(m, "rcu_bh:\n");
311 print_one_rcu_state(m, &rcu_bh_state);
312 return 0;
313}
314
315static int rcuhier_open(struct inode *inode, struct file *file)
316{
317 return single_open(file, show_rcuhier, NULL);
318}
319
9b2619af 320static const struct file_operations rcuhier_fops = {
64db4cff
PM		 321 .owner = THIS_MODULE,
322 .open = rcuhier_open,
323 .read = seq_read,
324 .llseek = seq_lseek,
325 .release = single_release,
326};
327
15ba0ba8
PM		 328static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp)
329{
330 unsigned long flags;
331 unsigned long completed;
332 unsigned long gpnum;
333 unsigned long gpage;
334 unsigned long gpmax;
335 struct rcu_node *rnp = &rsp->node[0];
336
337 raw_spin_lock_irqsave(&rnp->lock, flags);
338 completed = rsp->completed;
339 gpnum = rsp->gpnum;
340 if (rsp->completed == rsp->gpnum)
341 gpage = 0;
342 else
343 gpage = jiffies - rsp->gp_start;
344 gpmax = rsp->gp_max;
345 raw_spin_unlock_irqrestore(&rnp->lock, flags);
346 seq_printf(m, "%s: completed=%ld gpnum=%lu age=%ld max=%ld\n",
347 rsp->name, completed, gpnum, gpage, gpmax);
348}
349
64db4cff
PM		 350static int show_rcugp(struct seq_file *m, void *unused)
351{
f41d911f 352#ifdef CONFIG_TREE_PREEMPT_RCU
15ba0ba8 353 show_one_rcugp(m, &rcu_preempt_state);
f41d911f 354#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
15ba0ba8
PM		 355 show_one_rcugp(m, &rcu_sched_state);
356 show_one_rcugp(m, &rcu_bh_state);
64db4cff
PM		 357 return 0;
358}
359
360static int rcugp_open(struct inode *inode, struct file *file)
361{
362 return single_open(file, show_rcugp, NULL);
363}
364
9b2619af 365static const struct file_operations rcugp_fops = {
64db4cff
PM		 366 .owner = THIS_MODULE,
367 .open = rcugp_open,
368 .read = seq_read,
369 .llseek = seq_lseek,
370 .release = single_release,
371};
372
7ba5c840
PM		 373static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp)
374{
375 seq_printf(m, "%3d%cnp=%ld "
d21670ac
PM		 376 "qsp=%ld rpq=%ld cbr=%ld cng=%ld "
377 "gpc=%ld gps=%ld nf=%ld nn=%ld\n",
7ba5c840
PM		 378 rdp->cpu,
379 cpu_is_offline(rdp->cpu) ? '!' : ' ',
380 rdp->n_rcu_pending,
381 rdp->n_rp_qs_pending,
d21670ac 382 rdp->n_rp_report_qs,
7ba5c840
PM		 383 rdp->n_rp_cb_ready,
384 rdp->n_rp_cpu_needs_gp,
385 rdp->n_rp_gp_completed,
386 rdp->n_rp_gp_started,
387 rdp->n_rp_need_fqs,
388 rdp->n_rp_need_nothing);
389}
390
391static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp)
392{
393 int cpu;
394 struct rcu_data *rdp;
395
396 for_each_possible_cpu(cpu) {
394f99a9 397 rdp = per_cpu_ptr(rsp->rda, cpu);
7ba5c840
PM		 398 if (rdp->beenonline)
399 print_one_rcu_pending(m, rdp);
400 }
401}
402
403static int show_rcu_pending(struct seq_file *m, void *unused)
404{
f41d911f
PM		 405#ifdef CONFIG_TREE_PREEMPT_RCU
406 seq_puts(m, "rcu_preempt:\n");
407 print_rcu_pendings(m, &rcu_preempt_state);
408#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
d6714c22
PM		 409 seq_puts(m, "rcu_sched:\n");
410 print_rcu_pendings(m, &rcu_sched_state);
7ba5c840
PM		 411 seq_puts(m, "rcu_bh:\n");
412 print_rcu_pendings(m, &rcu_bh_state);
413 return 0;
414}
415
416static int rcu_pending_open(struct inode *inode, struct file *file)
417{
418 return single_open(file, show_rcu_pending, NULL);
419}
420
9b2619af 421static const struct file_operations rcu_pending_fops = {
7ba5c840
PM		 422 .owner = THIS_MODULE,
423 .open = rcu_pending_open,
424 .read = seq_read,
425 .llseek = seq_lseek,
426 .release = single_release,
427};
428
4a298656
PM		 429static int show_rcutorture(struct seq_file *m, void *unused)
430{
431 seq_printf(m, "rcutorture test sequence: %lu %s\n",
432 rcutorture_testseq >> 1,
433 (rcutorture_testseq & 0x1) ? "(test in progress)" : "");
434 seq_printf(m, "rcutorture update version number: %lu\n",
435 rcutorture_vernum);
436 return 0;
437}
438
439static int rcutorture_open(struct inode *inode, struct file *file)
440{
441 return single_open(file, show_rcutorture, NULL);
442}
443
444static const struct file_operations rcutorture_fops = {
445 .owner = THIS_MODULE,
446 .open = rcutorture_open,
447 .read = seq_read,
448 .llseek = seq_lseek,
449 .release = single_release,
450};
451
7ba5c840 452static struct dentry *rcudir;
7ba5c840 453
deb7a418 454static int __init rcutree_trace_init(void)
64db4cff 455{
22f00b69
PM		 456 struct dentry *retval;
457
64db4cff
PM		 458 rcudir = debugfs_create_dir("rcu", NULL);
459 if (!rcudir)
22f00b69 460 goto free_out;
64db4cff 461
22f00b69 462 retval = debugfs_create_file("rcudata", 0444, rcudir,
64db4cff 463 NULL, &rcudata_fops);
22f00b69 464 if (!retval)
64db4cff
PM		 465 goto free_out;
466
22f00b69 467 retval = debugfs_create_file("rcudata.csv", 0444, rcudir,
64db4cff 468 NULL, &rcudata_csv_fops);
22f00b69 469 if (!retval)
64db4cff
PM		 470 goto free_out;
471
0ea1f2eb
PM		 472 if (rcu_boost_trace_create_file(rcudir))
473 goto free_out;
474
22f00b69
PM		 475 retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
476 if (!retval)
64db4cff
PM		 477 goto free_out;
478
22f00b69 479 retval = debugfs_create_file("rcuhier", 0444, rcudir,
64db4cff 480 NULL, &rcuhier_fops);
22f00b69 481 if (!retval)
64db4cff 482 goto free_out;
7ba5c840 483
22f00b69 484 retval = debugfs_create_file("rcu_pending", 0444, rcudir,
7ba5c840 485 NULL, &rcu_pending_fops);
22f00b69 486 if (!retval)
7ba5c840 487 goto free_out;
4a298656
PM		 488
489 retval = debugfs_create_file("rcutorture", 0444, rcudir,
490 NULL, &rcutorture_fops);
491 if (!retval)
492 goto free_out;
64db4cff
PM		 493 return 0;
494free_out:
22f00b69 495 debugfs_remove_recursive(rcudir);
64db4cff
PM		 496 return 1;
497}
498
deb7a418 499static void __exit rcutree_trace_cleanup(void)
64db4cff 500{
22f00b69 501 debugfs_remove_recursive(rcudir);
64db4cff
PM		 502}
503
504
deb7a418
PM		 505module_init(rcutree_trace_init);
506module_exit(rcutree_trace_cleanup);
64db4cff
PM		 507
508MODULE_AUTHOR("Paul E. McKenney");
509MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
510MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)