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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 - | |
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 | ||
6258c4fb IM |
46 | #include "rcutree.h" |
47 | ||
64db4cff PM |
48 | static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp) |
49 | { | |
50 | if (!rdp->beenonline) | |
51 | return; | |
ef631b0c | 52 | seq_printf(m, "%3d%cc=%ld g=%ld pq=%d pqc=%ld qp=%d", |
64db4cff PM |
53 | rdp->cpu, |
54 | cpu_is_offline(rdp->cpu) ? '!' : ' ', | |
55 | rdp->completed, rdp->gpnum, | |
56 | rdp->passed_quiesc, rdp->passed_quiesc_completed, | |
ef631b0c | 57 | rdp->qs_pending); |
64db4cff PM |
58 | #ifdef CONFIG_NO_HZ |
59 | seq_printf(m, " dt=%d/%d dn=%d df=%lu", | |
60 | rdp->dynticks->dynticks, | |
61 | rdp->dynticks->dynticks_nesting, | |
62 | rdp->dynticks->dynticks_nmi, | |
63 | rdp->dynticks_fqs); | |
64 | #endif /* #ifdef CONFIG_NO_HZ */ | |
65 | seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi); | |
66 | seq_printf(m, " ql=%ld b=%ld\n", rdp->qlen, rdp->blimit); | |
67 | } | |
68 | ||
69 | #define PRINT_RCU_DATA(name, func, m) \ | |
70 | do { \ | |
71 | int _p_r_d_i; \ | |
72 | \ | |
73 | for_each_possible_cpu(_p_r_d_i) \ | |
74 | func(m, &per_cpu(name, _p_r_d_i)); \ | |
75 | } while (0) | |
76 | ||
77 | static int show_rcudata(struct seq_file *m, void *unused) | |
78 | { | |
79 | seq_puts(m, "rcu:\n"); | |
80 | PRINT_RCU_DATA(rcu_data, print_one_rcu_data, m); | |
81 | seq_puts(m, "rcu_bh:\n"); | |
82 | PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m); | |
83 | return 0; | |
84 | } | |
85 | ||
86 | static int rcudata_open(struct inode *inode, struct file *file) | |
87 | { | |
88 | return single_open(file, show_rcudata, NULL); | |
89 | } | |
90 | ||
91 | static struct file_operations rcudata_fops = { | |
92 | .owner = THIS_MODULE, | |
93 | .open = rcudata_open, | |
94 | .read = seq_read, | |
95 | .llseek = seq_lseek, | |
96 | .release = single_release, | |
97 | }; | |
98 | ||
99 | static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp) | |
100 | { | |
101 | if (!rdp->beenonline) | |
102 | return; | |
ef631b0c | 103 | seq_printf(m, "%d,%s,%ld,%ld,%d,%ld,%d", |
64db4cff PM |
104 | rdp->cpu, |
105 | cpu_is_offline(rdp->cpu) ? "\"Y\"" : "\"N\"", | |
106 | rdp->completed, rdp->gpnum, | |
107 | rdp->passed_quiesc, rdp->passed_quiesc_completed, | |
ef631b0c | 108 | rdp->qs_pending); |
64db4cff PM |
109 | #ifdef CONFIG_NO_HZ |
110 | seq_printf(m, ",%d,%d,%d,%lu", | |
111 | rdp->dynticks->dynticks, | |
112 | rdp->dynticks->dynticks_nesting, | |
113 | rdp->dynticks->dynticks_nmi, | |
114 | rdp->dynticks_fqs); | |
115 | #endif /* #ifdef CONFIG_NO_HZ */ | |
116 | seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi); | |
117 | seq_printf(m, ",%ld,%ld\n", rdp->qlen, rdp->blimit); | |
118 | } | |
119 | ||
120 | static int show_rcudata_csv(struct seq_file *m, void *unused) | |
121 | { | |
ef631b0c | 122 | seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\","); |
64db4cff PM |
123 | #ifdef CONFIG_NO_HZ |
124 | seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\","); | |
125 | #endif /* #ifdef CONFIG_NO_HZ */ | |
126 | seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\"\n"); | |
127 | seq_puts(m, "\"rcu:\"\n"); | |
128 | PRINT_RCU_DATA(rcu_data, print_one_rcu_data_csv, m); | |
129 | seq_puts(m, "\"rcu_bh:\"\n"); | |
130 | PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m); | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static int rcudata_csv_open(struct inode *inode, struct file *file) | |
135 | { | |
136 | return single_open(file, show_rcudata_csv, NULL); | |
137 | } | |
138 | ||
139 | static struct file_operations rcudata_csv_fops = { | |
140 | .owner = THIS_MODULE, | |
141 | .open = rcudata_csv_open, | |
142 | .read = seq_read, | |
143 | .llseek = seq_lseek, | |
144 | .release = single_release, | |
145 | }; | |
146 | ||
147 | static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp) | |
148 | { | |
149 | int level = 0; | |
150 | struct rcu_node *rnp; | |
151 | ||
152 | seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x " | |
153 | "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n", | |
154 | rsp->completed, rsp->gpnum, rsp->signaled, | |
155 | (long)(rsp->jiffies_force_qs - jiffies), | |
156 | (int)(jiffies & 0xffff), | |
157 | rsp->n_force_qs, rsp->n_force_qs_ngp, | |
158 | rsp->n_force_qs - rsp->n_force_qs_ngp, | |
159 | rsp->n_force_qs_lh); | |
160 | for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) { | |
161 | if (rnp->level != level) { | |
162 | seq_puts(m, "\n"); | |
163 | level = rnp->level; | |
164 | } | |
165 | seq_printf(m, "%lx/%lx %d:%d ^%d ", | |
166 | rnp->qsmask, rnp->qsmaskinit, | |
167 | rnp->grplo, rnp->grphi, rnp->grpnum); | |
168 | } | |
169 | seq_puts(m, "\n"); | |
170 | } | |
171 | ||
172 | static int show_rcuhier(struct seq_file *m, void *unused) | |
173 | { | |
174 | seq_puts(m, "rcu:\n"); | |
175 | print_one_rcu_state(m, &rcu_state); | |
176 | seq_puts(m, "rcu_bh:\n"); | |
177 | print_one_rcu_state(m, &rcu_bh_state); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int rcuhier_open(struct inode *inode, struct file *file) | |
182 | { | |
183 | return single_open(file, show_rcuhier, NULL); | |
184 | } | |
185 | ||
186 | static struct file_operations rcuhier_fops = { | |
187 | .owner = THIS_MODULE, | |
188 | .open = rcuhier_open, | |
189 | .read = seq_read, | |
190 | .llseek = seq_lseek, | |
191 | .release = single_release, | |
192 | }; | |
193 | ||
194 | static int show_rcugp(struct seq_file *m, void *unused) | |
195 | { | |
196 | seq_printf(m, "rcu: completed=%ld gpnum=%ld\n", | |
197 | rcu_state.completed, rcu_state.gpnum); | |
198 | seq_printf(m, "rcu_bh: completed=%ld gpnum=%ld\n", | |
199 | rcu_bh_state.completed, rcu_bh_state.gpnum); | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static int rcugp_open(struct inode *inode, struct file *file) | |
204 | { | |
205 | return single_open(file, show_rcugp, NULL); | |
206 | } | |
207 | ||
208 | static struct file_operations rcugp_fops = { | |
209 | .owner = THIS_MODULE, | |
210 | .open = rcugp_open, | |
211 | .read = seq_read, | |
212 | .llseek = seq_lseek, | |
213 | .release = single_release, | |
214 | }; | |
215 | ||
7ba5c840 PM |
216 | static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp) |
217 | { | |
218 | seq_printf(m, "%3d%cnp=%ld " | |
219 | "qsp=%ld cbr=%ld cng=%ld gpc=%ld gps=%ld nf=%ld nn=%ld\n", | |
220 | rdp->cpu, | |
221 | cpu_is_offline(rdp->cpu) ? '!' : ' ', | |
222 | rdp->n_rcu_pending, | |
223 | rdp->n_rp_qs_pending, | |
224 | rdp->n_rp_cb_ready, | |
225 | rdp->n_rp_cpu_needs_gp, | |
226 | rdp->n_rp_gp_completed, | |
227 | rdp->n_rp_gp_started, | |
228 | rdp->n_rp_need_fqs, | |
229 | rdp->n_rp_need_nothing); | |
230 | } | |
231 | ||
232 | static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp) | |
233 | { | |
234 | int cpu; | |
235 | struct rcu_data *rdp; | |
236 | ||
237 | for_each_possible_cpu(cpu) { | |
238 | rdp = rsp->rda[cpu]; | |
239 | if (rdp->beenonline) | |
240 | print_one_rcu_pending(m, rdp); | |
241 | } | |
242 | } | |
243 | ||
244 | static int show_rcu_pending(struct seq_file *m, void *unused) | |
245 | { | |
246 | seq_puts(m, "rcu:\n"); | |
247 | print_rcu_pendings(m, &rcu_state); | |
248 | seq_puts(m, "rcu_bh:\n"); | |
249 | print_rcu_pendings(m, &rcu_bh_state); | |
250 | return 0; | |
251 | } | |
252 | ||
253 | static int rcu_pending_open(struct inode *inode, struct file *file) | |
254 | { | |
255 | return single_open(file, show_rcu_pending, NULL); | |
256 | } | |
257 | ||
258 | static struct file_operations rcu_pending_fops = { | |
259 | .owner = THIS_MODULE, | |
260 | .open = rcu_pending_open, | |
261 | .read = seq_read, | |
262 | .llseek = seq_lseek, | |
263 | .release = single_release, | |
264 | }; | |
265 | ||
266 | static struct dentry *rcudir; | |
267 | static struct dentry *datadir; | |
268 | static struct dentry *datadir_csv; | |
269 | static struct dentry *gpdir; | |
270 | static struct dentry *hierdir; | |
271 | static struct dentry *rcu_pendingdir; | |
272 | ||
64db4cff PM |
273 | static int __init rcuclassic_trace_init(void) |
274 | { | |
275 | rcudir = debugfs_create_dir("rcu", NULL); | |
276 | if (!rcudir) | |
277 | goto out; | |
278 | ||
279 | datadir = debugfs_create_file("rcudata", 0444, rcudir, | |
280 | NULL, &rcudata_fops); | |
281 | if (!datadir) | |
282 | goto free_out; | |
283 | ||
284 | datadir_csv = debugfs_create_file("rcudata.csv", 0444, rcudir, | |
285 | NULL, &rcudata_csv_fops); | |
286 | if (!datadir_csv) | |
287 | goto free_out; | |
288 | ||
289 | gpdir = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops); | |
290 | if (!gpdir) | |
291 | goto free_out; | |
292 | ||
293 | hierdir = debugfs_create_file("rcuhier", 0444, rcudir, | |
294 | NULL, &rcuhier_fops); | |
295 | if (!hierdir) | |
296 | goto free_out; | |
7ba5c840 PM |
297 | |
298 | rcu_pendingdir = debugfs_create_file("rcu_pending", 0444, rcudir, | |
299 | NULL, &rcu_pending_fops); | |
300 | if (!rcu_pendingdir) | |
301 | goto free_out; | |
64db4cff PM |
302 | return 0; |
303 | free_out: | |
304 | if (datadir) | |
305 | debugfs_remove(datadir); | |
306 | if (datadir_csv) | |
307 | debugfs_remove(datadir_csv); | |
308 | if (gpdir) | |
309 | debugfs_remove(gpdir); | |
310 | debugfs_remove(rcudir); | |
311 | out: | |
312 | return 1; | |
313 | } | |
314 | ||
315 | static void __exit rcuclassic_trace_cleanup(void) | |
316 | { | |
317 | debugfs_remove(datadir); | |
318 | debugfs_remove(datadir_csv); | |
319 | debugfs_remove(gpdir); | |
320 | debugfs_remove(hierdir); | |
7ba5c840 | 321 | debugfs_remove(rcu_pendingdir); |
64db4cff PM |
322 | debugfs_remove(rcudir); |
323 | } | |
324 | ||
325 | ||
326 | module_init(rcuclassic_trace_init); | |
327 | module_exit(rcuclassic_trace_cleanup); | |
328 | ||
329 | MODULE_AUTHOR("Paul E. McKenney"); | |
330 | MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation"); | |
331 | MODULE_LICENSE("GPL"); |