Root/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
49static 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", rdp->qlen, rdp->blimit);
68    seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
69           rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
70}
71
72#define PRINT_RCU_DATA(name, func, m) \
73    do { \
74        int _p_r_d_i; \
75        \
76        for_each_possible_cpu(_p_r_d_i) \
77            func(m, &per_cpu(name, _p_r_d_i)); \
78    } while (0)
79
80static int show_rcudata(struct seq_file *m, void *unused)
81{
82#ifdef CONFIG_TREE_PREEMPT_RCU
83    seq_puts(m, "rcu_preempt:\n");
84    PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data, m);
85#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
86    seq_puts(m, "rcu_sched:\n");
87    PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data, m);
88    seq_puts(m, "rcu_bh:\n");
89    PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
90    return 0;
91}
92
93static int rcudata_open(struct inode *inode, struct file *file)
94{
95    return single_open(file, show_rcudata, NULL);
96}
97
98static const struct file_operations rcudata_fops = {
99    .owner = THIS_MODULE,
100    .open = rcudata_open,
101    .read = seq_read,
102    .llseek = seq_lseek,
103    .release = single_release,
104};
105
106static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
107{
108    if (!rdp->beenonline)
109        return;
110    seq_printf(m, "%d,%s,%lu,%lu,%d,%lu,%d",
111           rdp->cpu,
112           cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
113           rdp->completed, rdp->gpnum,
114           rdp->passed_quiesc, rdp->passed_quiesc_completed,
115           rdp->qs_pending);
116#ifdef CONFIG_NO_HZ
117    seq_printf(m, ",%d,%d,%d,%lu",
118           rdp->dynticks->dynticks,
119           rdp->dynticks->dynticks_nesting,
120           rdp->dynticks->dynticks_nmi,
121           rdp->dynticks_fqs);
122#endif /* #ifdef CONFIG_NO_HZ */
123    seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
124    seq_printf(m, ",%ld,%ld", rdp->qlen, rdp->blimit);
125    seq_printf(m, ",%lu,%lu,%lu\n",
126           rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
127}
128
129static int show_rcudata_csv(struct seq_file *m, void *unused)
130{
131    seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\",");
132#ifdef CONFIG_NO_HZ
133    seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\",");
134#endif /* #ifdef CONFIG_NO_HZ */
135    seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\",\"ci\",\"co\",\"ca\"\n");
136#ifdef CONFIG_TREE_PREEMPT_RCU
137    seq_puts(m, "\"rcu_preempt:\"\n");
138    PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data_csv, m);
139#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
140    seq_puts(m, "\"rcu_sched:\"\n");
141    PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data_csv, m);
142    seq_puts(m, "\"rcu_bh:\"\n");
143    PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
144    return 0;
145}
146
147static int rcudata_csv_open(struct inode *inode, struct file *file)
148{
149    return single_open(file, show_rcudata_csv, NULL);
150}
151
152static const struct file_operations rcudata_csv_fops = {
153    .owner = THIS_MODULE,
154    .open = rcudata_csv_open,
155    .read = seq_read,
156    .llseek = seq_lseek,
157    .release = single_release,
158};
159
160static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
161{
162    unsigned long gpnum;
163    int level = 0;
164    int phase;
165    struct rcu_node *rnp;
166
167    gpnum = rsp->gpnum;
168    seq_printf(m, "c=%lu g=%lu s=%d jfq=%ld j=%x "
169              "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",
170           rsp->completed, gpnum, rsp->signaled,
171           (long)(rsp->jiffies_force_qs - jiffies),
172           (int)(jiffies & 0xffff),
173           rsp->n_force_qs, rsp->n_force_qs_ngp,
174           rsp->n_force_qs - rsp->n_force_qs_ngp,
175           rsp->n_force_qs_lh);
176    for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) {
177        if (rnp->level != level) {
178            seq_puts(m, "\n");
179            level = rnp->level;
180        }
181        phase = gpnum & 0x1;
182        seq_printf(m, "%lx/%lx %c%c>%c%c %d:%d ^%d ",
183               rnp->qsmask, rnp->qsmaskinit,
184               "T."[list_empty(&rnp->blocked_tasks[phase])],
185               "E."[list_empty(&rnp->blocked_tasks[phase + 2])],
186               "T."[list_empty(&rnp->blocked_tasks[!phase])],
187               "E."[list_empty(&rnp->blocked_tasks[!phase + 2])],
188               rnp->grplo, rnp->grphi, rnp->grpnum);
189    }
190    seq_puts(m, "\n");
191}
192
193static int show_rcuhier(struct seq_file *m, void *unused)
194{
195#ifdef CONFIG_TREE_PREEMPT_RCU
196    seq_puts(m, "rcu_preempt:\n");
197    print_one_rcu_state(m, &rcu_preempt_state);
198#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
199    seq_puts(m, "rcu_sched:\n");
200    print_one_rcu_state(m, &rcu_sched_state);
201    seq_puts(m, "rcu_bh:\n");
202    print_one_rcu_state(m, &rcu_bh_state);
203    return 0;
204}
205
206static int rcuhier_open(struct inode *inode, struct file *file)
207{
208    return single_open(file, show_rcuhier, NULL);
209}
210
211static const struct file_operations rcuhier_fops = {
212    .owner = THIS_MODULE,
213    .open = rcuhier_open,
214    .read = seq_read,
215    .llseek = seq_lseek,
216    .release = single_release,
217};
218
219static int show_rcugp(struct seq_file *m, void *unused)
220{
221#ifdef CONFIG_TREE_PREEMPT_RCU
222    seq_printf(m, "rcu_preempt: completed=%ld gpnum=%lu\n",
223           rcu_preempt_state.completed, rcu_preempt_state.gpnum);
224#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
225    seq_printf(m, "rcu_sched: completed=%ld gpnum=%lu\n",
226           rcu_sched_state.completed, rcu_sched_state.gpnum);
227    seq_printf(m, "rcu_bh: completed=%ld gpnum=%lu\n",
228           rcu_bh_state.completed, rcu_bh_state.gpnum);
229    return 0;
230}
231
232static int rcugp_open(struct inode *inode, struct file *file)
233{
234    return single_open(file, show_rcugp, NULL);
235}
236
237static const struct file_operations rcugp_fops = {
238    .owner = THIS_MODULE,
239    .open = rcugp_open,
240    .read = seq_read,
241    .llseek = seq_lseek,
242    .release = single_release,
243};
244
245static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp)
246{
247    seq_printf(m, "%3d%cnp=%ld "
248           "qsp=%ld rpq=%ld cbr=%ld cng=%ld "
249           "gpc=%ld gps=%ld nf=%ld nn=%ld\n",
250           rdp->cpu,
251           cpu_is_offline(rdp->cpu) ? '!' : ' ',
252           rdp->n_rcu_pending,
253           rdp->n_rp_qs_pending,
254           rdp->n_rp_report_qs,
255           rdp->n_rp_cb_ready,
256           rdp->n_rp_cpu_needs_gp,
257           rdp->n_rp_gp_completed,
258           rdp->n_rp_gp_started,
259           rdp->n_rp_need_fqs,
260           rdp->n_rp_need_nothing);
261}
262
263static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp)
264{
265    int cpu;
266    struct rcu_data *rdp;
267
268    for_each_possible_cpu(cpu) {
269        rdp = per_cpu_ptr(rsp->rda, cpu);
270        if (rdp->beenonline)
271            print_one_rcu_pending(m, rdp);
272    }
273}
274
275static int show_rcu_pending(struct seq_file *m, void *unused)
276{
277#ifdef CONFIG_TREE_PREEMPT_RCU
278    seq_puts(m, "rcu_preempt:\n");
279    print_rcu_pendings(m, &rcu_preempt_state);
280#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
281    seq_puts(m, "rcu_sched:\n");
282    print_rcu_pendings(m, &rcu_sched_state);
283    seq_puts(m, "rcu_bh:\n");
284    print_rcu_pendings(m, &rcu_bh_state);
285    return 0;
286}
287
288static int rcu_pending_open(struct inode *inode, struct file *file)
289{
290    return single_open(file, show_rcu_pending, NULL);
291}
292
293static const struct file_operations rcu_pending_fops = {
294    .owner = THIS_MODULE,
295    .open = rcu_pending_open,
296    .read = seq_read,
297    .llseek = seq_lseek,
298    .release = single_release,
299};
300
301static struct dentry *rcudir;
302
303static int __init rcutree_trace_init(void)
304{
305    struct dentry *retval;
306
307    rcudir = debugfs_create_dir("rcu", NULL);
308    if (!rcudir)
309        goto free_out;
310
311    retval = debugfs_create_file("rcudata", 0444, rcudir,
312                        NULL, &rcudata_fops);
313    if (!retval)
314        goto free_out;
315
316    retval = debugfs_create_file("rcudata.csv", 0444, rcudir,
317                        NULL, &rcudata_csv_fops);
318    if (!retval)
319        goto free_out;
320
321    retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
322    if (!retval)
323        goto free_out;
324
325    retval = debugfs_create_file("rcuhier", 0444, rcudir,
326                        NULL, &rcuhier_fops);
327    if (!retval)
328        goto free_out;
329
330    retval = debugfs_create_file("rcu_pending", 0444, rcudir,
331                        NULL, &rcu_pending_fops);
332    if (!retval)
333        goto free_out;
334    return 0;
335free_out:
336    debugfs_remove_recursive(rcudir);
337    return 1;
338}
339
340static void __exit rcutree_trace_cleanup(void)
341{
342    debugfs_remove_recursive(rcudir);
343}
344
345
346module_init(rcutree_trace_init);
347module_exit(rcutree_trace_cleanup);
348
349MODULE_AUTHOR("Paul E. McKenney");
350MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
351MODULE_LICENSE("GPL");
352

Archive Download this file

Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master

Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9



interactive