rcu: Fix online/offline indication for rcudata.csv trace file
[linux-2.6.git] / kernel / rcutree_trace.c
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=%ld g=%ld pq=%d pqc=%ld 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         seq_puts(m, "rcu_sched:\n");
81         PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data, m);
82         seq_puts(m, "rcu_bh:\n");
83         PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
84         return 0;
85 }
86
87 static int rcudata_open(struct inode *inode, struct file *file)
88 {
89         return single_open(file, show_rcudata, NULL);
90 }
91
92 static struct file_operations rcudata_fops = {
93         .owner = THIS_MODULE,
94         .open = rcudata_open,
95         .read = seq_read,
96         .llseek = seq_lseek,
97         .release = single_release,
98 };
99
100 static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
101 {
102         if (!rdp->beenonline)
103                 return;
104         seq_printf(m, "%d,%s,%ld,%ld,%d,%ld,%d",
105                    rdp->cpu,
106                    cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
107                    rdp->completed, rdp->gpnum,
108                    rdp->passed_quiesc, rdp->passed_quiesc_completed,
109                    rdp->qs_pending);
110 #ifdef CONFIG_NO_HZ
111         seq_printf(m, ",%d,%d,%d,%lu",
112                    rdp->dynticks->dynticks,
113                    rdp->dynticks->dynticks_nesting,
114                    rdp->dynticks->dynticks_nmi,
115                    rdp->dynticks_fqs);
116 #endif /* #ifdef CONFIG_NO_HZ */
117         seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
118         seq_printf(m, ",%ld,%ld\n", rdp->qlen, rdp->blimit);
119 }
120
121 static int show_rcudata_csv(struct seq_file *m, void *unused)
122 {
123         seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\",");
124 #ifdef CONFIG_NO_HZ
125         seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\",");
126 #endif /* #ifdef CONFIG_NO_HZ */
127         seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\"\n");
128         seq_puts(m, "\"rcu_sched:\"\n");
129         PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data_csv, m);
130         seq_puts(m, "\"rcu_bh:\"\n");
131         PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
132         return 0;
133 }
134
135 static int rcudata_csv_open(struct inode *inode, struct file *file)
136 {
137         return single_open(file, show_rcudata_csv, NULL);
138 }
139
140 static struct file_operations rcudata_csv_fops = {
141         .owner = THIS_MODULE,
142         .open = rcudata_csv_open,
143         .read = seq_read,
144         .llseek = seq_lseek,
145         .release = single_release,
146 };
147
148 static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
149 {
150         int level = 0;
151         struct rcu_node *rnp;
152
153         seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x "
154                       "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",
155                    rsp->completed, rsp->gpnum, rsp->signaled,
156                    (long)(rsp->jiffies_force_qs - jiffies),
157                    (int)(jiffies & 0xffff),
158                    rsp->n_force_qs, rsp->n_force_qs_ngp,
159                    rsp->n_force_qs - rsp->n_force_qs_ngp,
160                    rsp->n_force_qs_lh);
161         for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) {
162                 if (rnp->level != level) {
163                         seq_puts(m, "\n");
164                         level = rnp->level;
165                 }
166                 seq_printf(m, "%lx/%lx %d:%d ^%d    ",
167                            rnp->qsmask, rnp->qsmaskinit,
168                            rnp->grplo, rnp->grphi, rnp->grpnum);
169         }
170         seq_puts(m, "\n");
171 }
172
173 static int show_rcuhier(struct seq_file *m, void *unused)
174 {
175         seq_puts(m, "rcu_sched:\n");
176         print_one_rcu_state(m, &rcu_sched_state);
177         seq_puts(m, "rcu_bh:\n");
178         print_one_rcu_state(m, &rcu_bh_state);
179         return 0;
180 }
181
182 static int rcuhier_open(struct inode *inode, struct file *file)
183 {
184         return single_open(file, show_rcuhier, NULL);
185 }
186
187 static struct file_operations rcuhier_fops = {
188         .owner = THIS_MODULE,
189         .open = rcuhier_open,
190         .read = seq_read,
191         .llseek = seq_lseek,
192         .release = single_release,
193 };
194
195 static int show_rcugp(struct seq_file *m, void *unused)
196 {
197         seq_printf(m, "rcu_sched: completed=%ld  gpnum=%ld\n",
198                    rcu_sched_state.completed, rcu_sched_state.gpnum);
199         seq_printf(m, "rcu_bh: completed=%ld  gpnum=%ld\n",
200                    rcu_bh_state.completed, rcu_bh_state.gpnum);
201         return 0;
202 }
203
204 static int rcugp_open(struct inode *inode, struct file *file)
205 {
206         return single_open(file, show_rcugp, NULL);
207 }
208
209 static struct file_operations rcugp_fops = {
210         .owner = THIS_MODULE,
211         .open = rcugp_open,
212         .read = seq_read,
213         .llseek = seq_lseek,
214         .release = single_release,
215 };
216
217 static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp)
218 {
219         seq_printf(m, "%3d%cnp=%ld "
220                    "qsp=%ld cbr=%ld cng=%ld gpc=%ld gps=%ld nf=%ld nn=%ld\n",
221                    rdp->cpu,
222                    cpu_is_offline(rdp->cpu) ? '!' : ' ',
223                    rdp->n_rcu_pending,
224                    rdp->n_rp_qs_pending,
225                    rdp->n_rp_cb_ready,
226                    rdp->n_rp_cpu_needs_gp,
227                    rdp->n_rp_gp_completed,
228                    rdp->n_rp_gp_started,
229                    rdp->n_rp_need_fqs,
230                    rdp->n_rp_need_nothing);
231 }
232
233 static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp)
234 {
235         int cpu;
236         struct rcu_data *rdp;
237
238         for_each_possible_cpu(cpu) {
239                 rdp = rsp->rda[cpu];
240                 if (rdp->beenonline)
241                         print_one_rcu_pending(m, rdp);
242         }
243 }
244
245 static int show_rcu_pending(struct seq_file *m, void *unused)
246 {
247         seq_puts(m, "rcu_sched:\n");
248         print_rcu_pendings(m, &rcu_sched_state);
249         seq_puts(m, "rcu_bh:\n");
250         print_rcu_pendings(m, &rcu_bh_state);
251         return 0;
252 }
253
254 static int rcu_pending_open(struct inode *inode, struct file *file)
255 {
256         return single_open(file, show_rcu_pending, NULL);
257 }
258
259 static struct file_operations rcu_pending_fops = {
260         .owner = THIS_MODULE,
261         .open = rcu_pending_open,
262         .read = seq_read,
263         .llseek = seq_lseek,
264         .release = single_release,
265 };
266
267 static struct dentry *rcudir;
268 static struct dentry *datadir;
269 static struct dentry *datadir_csv;
270 static struct dentry *gpdir;
271 static struct dentry *hierdir;
272 static struct dentry *rcu_pendingdir;
273
274 static int __init rcuclassic_trace_init(void)
275 {
276         rcudir = debugfs_create_dir("rcu", NULL);
277         if (!rcudir)
278                 goto out;
279
280         datadir = debugfs_create_file("rcudata", 0444, rcudir,
281                                                 NULL, &rcudata_fops);
282         if (!datadir)
283                 goto free_out;
284
285         datadir_csv = debugfs_create_file("rcudata.csv", 0444, rcudir,
286                                                 NULL, &rcudata_csv_fops);
287         if (!datadir_csv)
288                 goto free_out;
289
290         gpdir = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
291         if (!gpdir)
292                 goto free_out;
293
294         hierdir = debugfs_create_file("rcuhier", 0444, rcudir,
295                                                 NULL, &rcuhier_fops);
296         if (!hierdir)
297                 goto free_out;
298
299         rcu_pendingdir = debugfs_create_file("rcu_pending", 0444, rcudir,
300                                                 NULL, &rcu_pending_fops);
301         if (!rcu_pendingdir)
302                 goto free_out;
303         return 0;
304 free_out:
305         if (datadir)
306                 debugfs_remove(datadir);
307         if (datadir_csv)
308                 debugfs_remove(datadir_csv);
309         if (gpdir)
310                 debugfs_remove(gpdir);
311         debugfs_remove(rcudir);
312 out:
313         return 1;
314 }
315
316 static void __exit rcuclassic_trace_cleanup(void)
317 {
318         debugfs_remove(datadir);
319         debugfs_remove(datadir_csv);
320         debugfs_remove(gpdir);
321         debugfs_remove(hierdir);
322         debugfs_remove(rcu_pendingdir);
323         debugfs_remove(rcudir);
324 }
325
326
327 module_init(rcuclassic_trace_init);
328 module_exit(rcuclassic_trace_cleanup);
329
330 MODULE_AUTHOR("Paul E. McKenney");
331 MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
332 MODULE_LICENSE("GPL");