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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 <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> |
45 | |
46 | #define RCU_TREE_NONCORE |
47 | #include "rcutree.h" |
48 | |
49 | static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp) |
50 | { |
51 | if (!rdp->beenonline) |
52 | return; |
53 | seq_printf(m, "%3d%cc=%lu g=%lu pq=%d pqc=%lu qp=%d", |
54 | rdp->cpu, |
55 | cpu_is_offline(rdp->cpu) ? '!' : ' ', |
56 | rdp->completed, rdp->gpnum, |
57 | rdp->passed_quiesc, rdp->passed_quiesc_completed, |
58 | rdp->qs_pending); |
59 | #ifdef CONFIG_NO_HZ |
60 | seq_printf(m, " dt=%d/%d dn=%d df=%lu", |
61 | rdp->dynticks->dynticks, |
62 | rdp->dynticks->dynticks_nesting, |
63 | rdp->dynticks->dynticks_nmi, |
64 | rdp->dynticks_fqs); |
65 | #endif /* #ifdef CONFIG_NO_HZ */ |
66 | seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi); |
67 | seq_printf(m, " ql=%ld b=%ld\n", rdp->qlen, rdp->blimit); |
68 | } |
69 | |
70 | #define PRINT_RCU_DATA(name, func, m) \ |
71 | do { \ |
72 | int _p_r_d_i; \ |
73 | \ |
74 | for_each_possible_cpu(_p_r_d_i) \ |
75 | func(m, &per_cpu(name, _p_r_d_i)); \ |
76 | } while (0) |
77 | |
78 | static int show_rcudata(struct seq_file *m, void *unused) |
79 | { |
80 | #ifdef CONFIG_TREE_PREEMPT_RCU |
81 | seq_puts(m, "rcu_preempt:\n"); |
82 | PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data, m); |
83 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
84 | seq_puts(m, "rcu_sched:\n"); |
85 | PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data, m); |
86 | seq_puts(m, "rcu_bh:\n"); |
87 | PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m); |
88 | return 0; |
89 | } |
90 | |
91 | static int rcudata_open(struct inode *inode, struct file *file) |
92 | { |
93 | return single_open(file, show_rcudata, NULL); |
94 | } |
95 | |
96 | static const struct file_operations rcudata_fops = { |
97 | .owner = THIS_MODULE, |
98 | .open = rcudata_open, |
99 | .read = seq_read, |
100 | .llseek = seq_lseek, |
101 | .release = single_release, |
102 | }; |
103 | |
104 | static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp) |
105 | { |
106 | if (!rdp->beenonline) |
107 | return; |
108 | seq_printf(m, "%d,%s,%lu,%lu,%d,%lu,%d", |
109 | rdp->cpu, |
110 | cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"", |
111 | rdp->completed, rdp->gpnum, |
112 | rdp->passed_quiesc, rdp->passed_quiesc_completed, |
113 | rdp->qs_pending); |
114 | #ifdef CONFIG_NO_HZ |
115 | seq_printf(m, ",%d,%d,%d,%lu", |
116 | rdp->dynticks->dynticks, |
117 | rdp->dynticks->dynticks_nesting, |
118 | rdp->dynticks->dynticks_nmi, |
119 | rdp->dynticks_fqs); |
120 | #endif /* #ifdef CONFIG_NO_HZ */ |
121 | seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi); |
122 | seq_printf(m, ",%ld,%ld\n", rdp->qlen, rdp->blimit); |
123 | } |
124 | |
125 | static int show_rcudata_csv(struct seq_file *m, void *unused) |
126 | { |
127 | seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\","); |
128 | #ifdef CONFIG_NO_HZ |
129 | seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\","); |
130 | #endif /* #ifdef CONFIG_NO_HZ */ |
131 | seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\"\n"); |
132 | #ifdef CONFIG_TREE_PREEMPT_RCU |
133 | seq_puts(m, "\"rcu_preempt:\"\n"); |
134 | PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data_csv, m); |
135 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
136 | seq_puts(m, "\"rcu_sched:\"\n"); |
137 | PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data_csv, m); |
138 | seq_puts(m, "\"rcu_bh:\"\n"); |
139 | PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m); |
140 | return 0; |
141 | } |
142 | |
143 | static int rcudata_csv_open(struct inode *inode, struct file *file) |
144 | { |
145 | return single_open(file, show_rcudata_csv, NULL); |
146 | } |
147 | |
148 | static const struct file_operations rcudata_csv_fops = { |
149 | .owner = THIS_MODULE, |
150 | .open = rcudata_csv_open, |
151 | .read = seq_read, |
152 | .llseek = seq_lseek, |
153 | .release = single_release, |
154 | }; |
155 | |
156 | static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp) |
157 | { |
158 | unsigned long gpnum; |
159 | int level = 0; |
160 | int phase; |
161 | struct rcu_node *rnp; |
162 | |
163 | gpnum = rsp->gpnum; |
164 | seq_printf(m, "c=%lu g=%lu s=%d jfq=%ld j=%x " |
165 | "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld\n", |
166 | rsp->completed, gpnum, rsp->signaled, |
167 | (long)(rsp->jiffies_force_qs - jiffies), |
168 | (int)(jiffies & 0xffff), |
169 | rsp->n_force_qs, rsp->n_force_qs_ngp, |
170 | rsp->n_force_qs - rsp->n_force_qs_ngp, |
171 | rsp->n_force_qs_lh, rsp->orphan_qlen); |
172 | for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) { |
173 | if (rnp->level != level) { |
174 | seq_puts(m, "\n"); |
175 | level = rnp->level; |
176 | } |
177 | phase = gpnum & 0x1; |
178 | seq_printf(m, "%lx/%lx %c%c>%c%c %d:%d ^%d ", |
179 | rnp->qsmask, rnp->qsmaskinit, |
180 | "T."[list_empty(&rnp->blocked_tasks[phase])], |
181 | "E."[list_empty(&rnp->blocked_tasks[phase + 2])], |
182 | "T."[list_empty(&rnp->blocked_tasks[!phase])], |
183 | "E."[list_empty(&rnp->blocked_tasks[!phase + 2])], |
184 | rnp->grplo, rnp->grphi, rnp->grpnum); |
185 | } |
186 | seq_puts(m, "\n"); |
187 | } |
188 | |
189 | static int show_rcuhier(struct seq_file *m, void *unused) |
190 | { |
191 | #ifdef CONFIG_TREE_PREEMPT_RCU |
192 | seq_puts(m, "rcu_preempt:\n"); |
193 | print_one_rcu_state(m, &rcu_preempt_state); |
194 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
195 | seq_puts(m, "rcu_sched:\n"); |
196 | print_one_rcu_state(m, &rcu_sched_state); |
197 | seq_puts(m, "rcu_bh:\n"); |
198 | print_one_rcu_state(m, &rcu_bh_state); |
199 | return 0; |
200 | } |
201 | |
202 | static int rcuhier_open(struct inode *inode, struct file *file) |
203 | { |
204 | return single_open(file, show_rcuhier, NULL); |
205 | } |
206 | |
207 | static const struct file_operations rcuhier_fops = { |
208 | .owner = THIS_MODULE, |
209 | .open = rcuhier_open, |
210 | .read = seq_read, |
211 | .llseek = seq_lseek, |
212 | .release = single_release, |
213 | }; |
214 | |
215 | static int show_rcugp(struct seq_file *m, void *unused) |
216 | { |
217 | #ifdef CONFIG_TREE_PREEMPT_RCU |
218 | seq_printf(m, "rcu_preempt: completed=%ld gpnum=%lu\n", |
219 | rcu_preempt_state.completed, rcu_preempt_state.gpnum); |
220 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
221 | seq_printf(m, "rcu_sched: completed=%ld gpnum=%lu\n", |
222 | rcu_sched_state.completed, rcu_sched_state.gpnum); |
223 | seq_printf(m, "rcu_bh: completed=%ld gpnum=%lu\n", |
224 | rcu_bh_state.completed, rcu_bh_state.gpnum); |
225 | return 0; |
226 | } |
227 | |
228 | static int rcugp_open(struct inode *inode, struct file *file) |
229 | { |
230 | return single_open(file, show_rcugp, NULL); |
231 | } |
232 | |
233 | static const struct file_operations rcugp_fops = { |
234 | .owner = THIS_MODULE, |
235 | .open = rcugp_open, |
236 | .read = seq_read, |
237 | .llseek = seq_lseek, |
238 | .release = single_release, |
239 | }; |
240 | |
241 | static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp) |
242 | { |
243 | seq_printf(m, "%3d%cnp=%ld " |
244 | "qsp=%ld cbr=%ld cng=%ld gpc=%ld gps=%ld nf=%ld nn=%ld\n", |
245 | rdp->cpu, |
246 | cpu_is_offline(rdp->cpu) ? '!' : ' ', |
247 | rdp->n_rcu_pending, |
248 | rdp->n_rp_qs_pending, |
249 | rdp->n_rp_cb_ready, |
250 | rdp->n_rp_cpu_needs_gp, |
251 | rdp->n_rp_gp_completed, |
252 | rdp->n_rp_gp_started, |
253 | rdp->n_rp_need_fqs, |
254 | rdp->n_rp_need_nothing); |
255 | } |
256 | |
257 | static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp) |
258 | { |
259 | int cpu; |
260 | struct rcu_data *rdp; |
261 | |
262 | for_each_possible_cpu(cpu) { |
263 | rdp = rsp->rda[cpu]; |
264 | if (rdp->beenonline) |
265 | print_one_rcu_pending(m, rdp); |
266 | } |
267 | } |
268 | |
269 | static int show_rcu_pending(struct seq_file *m, void *unused) |
270 | { |
271 | #ifdef CONFIG_TREE_PREEMPT_RCU |
272 | seq_puts(m, "rcu_preempt:\n"); |
273 | print_rcu_pendings(m, &rcu_preempt_state); |
274 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
275 | seq_puts(m, "rcu_sched:\n"); |
276 | print_rcu_pendings(m, &rcu_sched_state); |
277 | seq_puts(m, "rcu_bh:\n"); |
278 | print_rcu_pendings(m, &rcu_bh_state); |
279 | return 0; |
280 | } |
281 | |
282 | static int rcu_pending_open(struct inode *inode, struct file *file) |
283 | { |
284 | return single_open(file, show_rcu_pending, NULL); |
285 | } |
286 | |
287 | static const struct file_operations rcu_pending_fops = { |
288 | .owner = THIS_MODULE, |
289 | .open = rcu_pending_open, |
290 | .read = seq_read, |
291 | .llseek = seq_lseek, |
292 | .release = single_release, |
293 | }; |
294 | |
295 | static struct dentry *rcudir; |
296 | |
297 | static int __init rcuclassic_trace_init(void) |
298 | { |
299 | struct dentry *retval; |
300 | |
301 | rcudir = debugfs_create_dir("rcu", NULL); |
302 | if (!rcudir) |
303 | goto free_out; |
304 | |
305 | retval = debugfs_create_file("rcudata", 0444, rcudir, |
306 | NULL, &rcudata_fops); |
307 | if (!retval) |
308 | goto free_out; |
309 | |
310 | retval = debugfs_create_file("rcudata.csv", 0444, rcudir, |
311 | NULL, &rcudata_csv_fops); |
312 | if (!retval) |
313 | goto free_out; |
314 | |
315 | retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops); |
316 | if (!retval) |
317 | goto free_out; |
318 | |
319 | retval = debugfs_create_file("rcuhier", 0444, rcudir, |
320 | NULL, &rcuhier_fops); |
321 | if (!retval) |
322 | goto free_out; |
323 | |
324 | retval = debugfs_create_file("rcu_pending", 0444, rcudir, |
325 | NULL, &rcu_pending_fops); |
326 | if (!retval) |
327 | goto free_out; |
328 | return 0; |
329 | free_out: |
330 | debugfs_remove_recursive(rcudir); |
331 | return 1; |
332 | } |
333 | |
334 | static void __exit rcuclassic_trace_cleanup(void) |
335 | { |
336 | debugfs_remove_recursive(rcudir); |
337 | } |
338 | |
339 | |
340 | module_init(rcuclassic_trace_init); |
341 | module_exit(rcuclassic_trace_cleanup); |
342 | |
343 | MODULE_AUTHOR("Paul E. McKenney"); |
344 | MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation"); |
345 | MODULE_LICENSE("GPL"); |
346 |
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