cifs: show sec= option in /proc/mounts
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / kernel / rcutree_trace.c
blob9678cc3650f5e9c8f4e3eb409d26e9c4e784e7d5
1 /*
2 * Read-Copy Update tracing for classic implementation
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.
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.
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.
18 * Copyright IBM Corporation, 2008
20 * Papers: http://www.rdrop.com/users/paulmck/RCU
22 * For detailed explanation of Read-Copy Update mechanism see -
23 * Documentation/RCU
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 <asm/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>
46 #define RCU_TREE_NONCORE
47 #include "rcutree.h"
49 DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_status);
50 DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_cpu);
51 DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_loops);
52 DECLARE_PER_CPU(char, rcu_cpu_has_work);
54 static char convert_kthread_status(unsigned int kthread_status)
56 if (kthread_status > RCU_KTHREAD_MAX)
57 return '?';
58 return "SRWOY"[kthread_status];
61 static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
63 if (!rdp->beenonline)
64 return;
65 seq_printf(m, "%3d%cc=%lu g=%lu pq=%d pqc=%lu qp=%d",
66 rdp->cpu,
67 cpu_is_offline(rdp->cpu) ? '!' : ' ',
68 rdp->completed, rdp->gpnum,
69 rdp->passed_quiesc, rdp->passed_quiesc_completed,
70 rdp->qs_pending);
71 #ifdef CONFIG_NO_HZ
72 seq_printf(m, " dt=%d/%d/%d df=%lu",
73 atomic_read(&rdp->dynticks->dynticks),
74 rdp->dynticks->dynticks_nesting,
75 rdp->dynticks->dynticks_nmi_nesting,
76 rdp->dynticks_fqs);
77 #endif /* #ifdef CONFIG_NO_HZ */
78 seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi);
79 seq_printf(m, " ql=%ld qs=%c%c%c%c kt=%d/%c/%d ktl=%x b=%ld",
80 rdp->qlen,
81 ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
82 rdp->nxttail[RCU_NEXT_TAIL]],
83 ".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
84 rdp->nxttail[RCU_NEXT_READY_TAIL]],
85 ".W"[rdp->nxttail[RCU_DONE_TAIL] !=
86 rdp->nxttail[RCU_WAIT_TAIL]],
87 ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]],
88 per_cpu(rcu_cpu_has_work, rdp->cpu),
89 convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
90 rdp->cpu)),
91 per_cpu(rcu_cpu_kthread_cpu, rdp->cpu),
92 per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff,
93 rdp->blimit);
94 seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
95 rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
98 #define PRINT_RCU_DATA(name, func, m) \
99 do { \
100 int _p_r_d_i; \
102 for_each_possible_cpu(_p_r_d_i) \
103 func(m, &per_cpu(name, _p_r_d_i)); \
104 } while (0)
106 static int show_rcudata(struct seq_file *m, void *unused)
108 #ifdef CONFIG_TREE_PREEMPT_RCU
109 seq_puts(m, "rcu_preempt:\n");
110 PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data, m);
111 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
112 seq_puts(m, "rcu_sched:\n");
113 PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data, m);
114 seq_puts(m, "rcu_bh:\n");
115 PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
116 return 0;
119 static int rcudata_open(struct inode *inode, struct file *file)
121 return single_open(file, show_rcudata, NULL);
124 static const struct file_operations rcudata_fops = {
125 .owner = THIS_MODULE,
126 .open = rcudata_open,
127 .read = seq_read,
128 .llseek = seq_lseek,
129 .release = single_release,
132 static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
134 if (!rdp->beenonline)
135 return;
136 seq_printf(m, "%d,%s,%lu,%lu,%d,%lu,%d",
137 rdp->cpu,
138 cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
139 rdp->completed, rdp->gpnum,
140 rdp->passed_quiesc, rdp->passed_quiesc_completed,
141 rdp->qs_pending);
142 #ifdef CONFIG_NO_HZ
143 seq_printf(m, ",%d,%d,%d,%lu",
144 atomic_read(&rdp->dynticks->dynticks),
145 rdp->dynticks->dynticks_nesting,
146 rdp->dynticks->dynticks_nmi_nesting,
147 rdp->dynticks_fqs);
148 #endif /* #ifdef CONFIG_NO_HZ */
149 seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
150 seq_printf(m, ",%ld,\"%c%c%c%c\",%d,\"%c\",%ld", rdp->qlen,
151 ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
152 rdp->nxttail[RCU_NEXT_TAIL]],
153 ".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
154 rdp->nxttail[RCU_NEXT_READY_TAIL]],
155 ".W"[rdp->nxttail[RCU_DONE_TAIL] !=
156 rdp->nxttail[RCU_WAIT_TAIL]],
157 ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]],
158 per_cpu(rcu_cpu_has_work, rdp->cpu),
159 convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
160 rdp->cpu)),
161 rdp->blimit);
162 seq_printf(m, ",%lu,%lu,%lu\n",
163 rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
166 static int show_rcudata_csv(struct seq_file *m, void *unused)
168 seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\",");
169 #ifdef CONFIG_NO_HZ
170 seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\",");
171 #endif /* #ifdef CONFIG_NO_HZ */
172 seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\",\"ci\",\"co\",\"ca\"\n");
173 #ifdef CONFIG_TREE_PREEMPT_RCU
174 seq_puts(m, "\"rcu_preempt:\"\n");
175 PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data_csv, m);
176 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
177 seq_puts(m, "\"rcu_sched:\"\n");
178 PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data_csv, m);
179 seq_puts(m, "\"rcu_bh:\"\n");
180 PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
181 return 0;
184 static int rcudata_csv_open(struct inode *inode, struct file *file)
186 return single_open(file, show_rcudata_csv, NULL);
189 static const struct file_operations rcudata_csv_fops = {
190 .owner = THIS_MODULE,
191 .open = rcudata_csv_open,
192 .read = seq_read,
193 .llseek = seq_lseek,
194 .release = single_release,
197 #ifdef CONFIG_RCU_BOOST
199 static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp)
201 seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu "
202 "j=%04x bt=%04x\n",
203 rnp->grplo, rnp->grphi,
204 "T."[list_empty(&rnp->blkd_tasks)],
205 "N."[!rnp->gp_tasks],
206 "E."[!rnp->exp_tasks],
207 "B."[!rnp->boost_tasks],
208 convert_kthread_status(rnp->boost_kthread_status),
209 rnp->n_tasks_boosted, rnp->n_exp_boosts,
210 rnp->n_normal_boosts,
211 (int)(jiffies & 0xffff),
212 (int)(rnp->boost_time & 0xffff));
213 seq_printf(m, "%s: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
214 " balk",
215 rnp->n_balk_blkd_tasks,
216 rnp->n_balk_exp_gp_tasks,
217 rnp->n_balk_boost_tasks,
218 rnp->n_balk_notblocked,
219 rnp->n_balk_notyet,
220 rnp->n_balk_nos);
223 static int show_rcu_node_boost(struct seq_file *m, void *unused)
225 struct rcu_node *rnp;
227 rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
228 print_one_rcu_node_boost(m, rnp);
229 return 0;
232 static int rcu_node_boost_open(struct inode *inode, struct file *file)
234 return single_open(file, show_rcu_node_boost, NULL);
237 static const struct file_operations rcu_node_boost_fops = {
238 .owner = THIS_MODULE,
239 .open = rcu_node_boost_open,
240 .read = seq_read,
241 .llseek = seq_lseek,
242 .release = single_release,
246 * Create the rcuboost debugfs entry. Standard error return.
248 static int rcu_boost_trace_create_file(struct dentry *rcudir)
250 return !debugfs_create_file("rcuboost", 0444, rcudir, NULL,
251 &rcu_node_boost_fops);
254 #else /* #ifdef CONFIG_RCU_BOOST */
256 static int rcu_boost_trace_create_file(struct dentry *rcudir)
258 return 0; /* There cannot be an error if we didn't create it! */
261 #endif /* #else #ifdef CONFIG_RCU_BOOST */
263 static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
265 unsigned long gpnum;
266 int level = 0;
267 struct rcu_node *rnp;
269 gpnum = rsp->gpnum;
270 seq_printf(m, "c=%lu g=%lu s=%d jfq=%ld j=%x "
271 "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",
272 rsp->completed, gpnum, rsp->signaled,
273 (long)(rsp->jiffies_force_qs - jiffies),
274 (int)(jiffies & 0xffff),
275 rsp->n_force_qs, rsp->n_force_qs_ngp,
276 rsp->n_force_qs - rsp->n_force_qs_ngp,
277 rsp->n_force_qs_lh);
278 for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) {
279 if (rnp->level != level) {
280 seq_puts(m, "\n");
281 level = rnp->level;
283 seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ",
284 rnp->qsmask, rnp->qsmaskinit,
285 ".G"[rnp->gp_tasks != NULL],
286 ".E"[rnp->exp_tasks != NULL],
287 ".T"[!list_empty(&rnp->blkd_tasks)],
288 rnp->grplo, rnp->grphi, rnp->grpnum);
290 seq_puts(m, "\n");
293 static int show_rcuhier(struct seq_file *m, void *unused)
295 #ifdef CONFIG_TREE_PREEMPT_RCU
296 seq_puts(m, "rcu_preempt:\n");
297 print_one_rcu_state(m, &rcu_preempt_state);
298 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
299 seq_puts(m, "rcu_sched:\n");
300 print_one_rcu_state(m, &rcu_sched_state);
301 seq_puts(m, "rcu_bh:\n");
302 print_one_rcu_state(m, &rcu_bh_state);
303 return 0;
306 static int rcuhier_open(struct inode *inode, struct file *file)
308 return single_open(file, show_rcuhier, NULL);
311 static const struct file_operations rcuhier_fops = {
312 .owner = THIS_MODULE,
313 .open = rcuhier_open,
314 .read = seq_read,
315 .llseek = seq_lseek,
316 .release = single_release,
319 static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp)
321 unsigned long flags;
322 unsigned long completed;
323 unsigned long gpnum;
324 unsigned long gpage;
325 unsigned long gpmax;
326 struct rcu_node *rnp = &rsp->node[0];
328 raw_spin_lock_irqsave(&rnp->lock, flags);
329 completed = rsp->completed;
330 gpnum = rsp->gpnum;
331 if (rsp->completed == rsp->gpnum)
332 gpage = 0;
333 else
334 gpage = jiffies - rsp->gp_start;
335 gpmax = rsp->gp_max;
336 raw_spin_unlock_irqrestore(&rnp->lock, flags);
337 seq_printf(m, "%s: completed=%ld gpnum=%lu age=%ld max=%ld\n",
338 rsp->name, completed, gpnum, gpage, gpmax);
341 static int show_rcugp(struct seq_file *m, void *unused)
343 #ifdef CONFIG_TREE_PREEMPT_RCU
344 show_one_rcugp(m, &rcu_preempt_state);
345 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
346 show_one_rcugp(m, &rcu_sched_state);
347 show_one_rcugp(m, &rcu_bh_state);
348 return 0;
351 static int rcugp_open(struct inode *inode, struct file *file)
353 return single_open(file, show_rcugp, NULL);
356 static const struct file_operations rcugp_fops = {
357 .owner = THIS_MODULE,
358 .open = rcugp_open,
359 .read = seq_read,
360 .llseek = seq_lseek,
361 .release = single_release,
364 static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp)
366 seq_printf(m, "%3d%cnp=%ld "
367 "qsp=%ld rpq=%ld cbr=%ld cng=%ld "
368 "gpc=%ld gps=%ld nf=%ld nn=%ld\n",
369 rdp->cpu,
370 cpu_is_offline(rdp->cpu) ? '!' : ' ',
371 rdp->n_rcu_pending,
372 rdp->n_rp_qs_pending,
373 rdp->n_rp_report_qs,
374 rdp->n_rp_cb_ready,
375 rdp->n_rp_cpu_needs_gp,
376 rdp->n_rp_gp_completed,
377 rdp->n_rp_gp_started,
378 rdp->n_rp_need_fqs,
379 rdp->n_rp_need_nothing);
382 static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp)
384 int cpu;
385 struct rcu_data *rdp;
387 for_each_possible_cpu(cpu) {
388 rdp = per_cpu_ptr(rsp->rda, cpu);
389 if (rdp->beenonline)
390 print_one_rcu_pending(m, rdp);
394 static int show_rcu_pending(struct seq_file *m, void *unused)
396 #ifdef CONFIG_TREE_PREEMPT_RCU
397 seq_puts(m, "rcu_preempt:\n");
398 print_rcu_pendings(m, &rcu_preempt_state);
399 #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
400 seq_puts(m, "rcu_sched:\n");
401 print_rcu_pendings(m, &rcu_sched_state);
402 seq_puts(m, "rcu_bh:\n");
403 print_rcu_pendings(m, &rcu_bh_state);
404 return 0;
407 static int rcu_pending_open(struct inode *inode, struct file *file)
409 return single_open(file, show_rcu_pending, NULL);
412 static const struct file_operations rcu_pending_fops = {
413 .owner = THIS_MODULE,
414 .open = rcu_pending_open,
415 .read = seq_read,
416 .llseek = seq_lseek,
417 .release = single_release,
420 static int show_rcutorture(struct seq_file *m, void *unused)
422 seq_printf(m, "rcutorture test sequence: %lu %s\n",
423 rcutorture_testseq >> 1,
424 (rcutorture_testseq & 0x1) ? "(test in progress)" : "");
425 seq_printf(m, "rcutorture update version number: %lu\n",
426 rcutorture_vernum);
427 return 0;
430 static int rcutorture_open(struct inode *inode, struct file *file)
432 return single_open(file, show_rcutorture, NULL);
435 static const struct file_operations rcutorture_fops = {
436 .owner = THIS_MODULE,
437 .open = rcutorture_open,
438 .read = seq_read,
439 .llseek = seq_lseek,
440 .release = single_release,
443 static struct dentry *rcudir;
445 static int __init rcutree_trace_init(void)
447 struct dentry *retval;
449 rcudir = debugfs_create_dir("rcu", NULL);
450 if (!rcudir)
451 goto free_out;
453 retval = debugfs_create_file("rcudata", 0444, rcudir,
454 NULL, &rcudata_fops);
455 if (!retval)
456 goto free_out;
458 retval = debugfs_create_file("rcudata.csv", 0444, rcudir,
459 NULL, &rcudata_csv_fops);
460 if (!retval)
461 goto free_out;
463 if (rcu_boost_trace_create_file(rcudir))
464 goto free_out;
466 retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
467 if (!retval)
468 goto free_out;
470 retval = debugfs_create_file("rcuhier", 0444, rcudir,
471 NULL, &rcuhier_fops);
472 if (!retval)
473 goto free_out;
475 retval = debugfs_create_file("rcu_pending", 0444, rcudir,
476 NULL, &rcu_pending_fops);
477 if (!retval)
478 goto free_out;
480 retval = debugfs_create_file("rcutorture", 0444, rcudir,
481 NULL, &rcutorture_fops);
482 if (!retval)
483 goto free_out;
484 return 0;
485 free_out:
486 debugfs_remove_recursive(rcudir);
487 return 1;
490 static void __exit rcutree_trace_cleanup(void)
492 debugfs_remove_recursive(rcudir);
496 module_init(rcutree_trace_init);
497 module_exit(rcutree_trace_cleanup);
499 MODULE_AUTHOR("Paul E. McKenney");
500 MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
501 MODULE_LICENSE("GPL");