Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 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 | |
Ingo Molnar | 6258c4f | 2009-03-25 16:42:24 +0100 | [diff] [blame] | 46 | #include "rcutree.h" |
| 47 | |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 48 | static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp) |
| 49 | { |
| 50 | if (!rdp->beenonline) |
| 51 | return; |
Paul E. McKenney | ef631b0 | 2009-04-13 21:31:16 -0700 | [diff] [blame] | 52 | seq_printf(m, "%3d%cc=%ld g=%ld pq=%d pqc=%ld qp=%d", |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 53 | rdp->cpu, |
| 54 | cpu_is_offline(rdp->cpu) ? '!' : ' ', |
| 55 | rdp->completed, rdp->gpnum, |
| 56 | rdp->passed_quiesc, rdp->passed_quiesc_completed, |
Paul E. McKenney | ef631b0 | 2009-04-13 21:31:16 -0700 | [diff] [blame] | 57 | rdp->qs_pending); |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 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; |
Paul E. McKenney | ef631b0 | 2009-04-13 21:31:16 -0700 | [diff] [blame] | 103 | seq_printf(m, "%d,%s,%ld,%ld,%d,%ld,%d", |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 104 | rdp->cpu, |
| 105 | cpu_is_offline(rdp->cpu) ? "\"Y\"" : "\"N\"", |
| 106 | rdp->completed, rdp->gpnum, |
| 107 | rdp->passed_quiesc, rdp->passed_quiesc_completed, |
Paul E. McKenney | ef631b0 | 2009-04-13 21:31:16 -0700 | [diff] [blame] | 108 | rdp->qs_pending); |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 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 | { |
Paul E. McKenney | ef631b0 | 2009-04-13 21:31:16 -0700 | [diff] [blame] | 122 | seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\","); |
Paul E. McKenney | 64db4cf | 2008-12-18 21:55:32 +0100 | [diff] [blame] | 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 | |
| 216 | static struct dentry *rcudir, *datadir, *datadir_csv, *hierdir, *gpdir; |
| 217 | static int __init rcuclassic_trace_init(void) |
| 218 | { |
| 219 | rcudir = debugfs_create_dir("rcu", NULL); |
| 220 | if (!rcudir) |
| 221 | goto out; |
| 222 | |
| 223 | datadir = debugfs_create_file("rcudata", 0444, rcudir, |
| 224 | NULL, &rcudata_fops); |
| 225 | if (!datadir) |
| 226 | goto free_out; |
| 227 | |
| 228 | datadir_csv = debugfs_create_file("rcudata.csv", 0444, rcudir, |
| 229 | NULL, &rcudata_csv_fops); |
| 230 | if (!datadir_csv) |
| 231 | goto free_out; |
| 232 | |
| 233 | gpdir = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops); |
| 234 | if (!gpdir) |
| 235 | goto free_out; |
| 236 | |
| 237 | hierdir = debugfs_create_file("rcuhier", 0444, rcudir, |
| 238 | NULL, &rcuhier_fops); |
| 239 | if (!hierdir) |
| 240 | goto free_out; |
| 241 | return 0; |
| 242 | free_out: |
| 243 | if (datadir) |
| 244 | debugfs_remove(datadir); |
| 245 | if (datadir_csv) |
| 246 | debugfs_remove(datadir_csv); |
| 247 | if (gpdir) |
| 248 | debugfs_remove(gpdir); |
| 249 | debugfs_remove(rcudir); |
| 250 | out: |
| 251 | return 1; |
| 252 | } |
| 253 | |
| 254 | static void __exit rcuclassic_trace_cleanup(void) |
| 255 | { |
| 256 | debugfs_remove(datadir); |
| 257 | debugfs_remove(datadir_csv); |
| 258 | debugfs_remove(gpdir); |
| 259 | debugfs_remove(hierdir); |
| 260 | debugfs_remove(rcudir); |
| 261 | } |
| 262 | |
| 263 | |
| 264 | module_init(rcuclassic_trace_init); |
| 265 | module_exit(rcuclassic_trace_cleanup); |
| 266 | |
| 267 | MODULE_AUTHOR("Paul E. McKenney"); |
| 268 | MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation"); |
| 269 | MODULE_LICENSE("GPL"); |