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