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 <linux/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 int r_open(struct inode *inode, struct file *file,
  50                                         const struct seq_operations *op)
  51 {
  52         int ret = seq_open(file, op);
  53         if (!ret) {
  54                 struct seq_file *m = (struct seq_file *)file->private_data;
  55                 m->private = inode->i_private;
  56         }
  57         return ret;
  58 }
  59
  60 static void *r_start(struct seq_file *m, loff_t *pos)
  61 {
  62         struct rcu_state *rsp = (struct rcu_state *)m->private;
  63         *pos = cpumask_next(*pos - 1, cpu_possible_mask);
  64         if ((*pos) < nr_cpu_ids)
  65                 return per_cpu_ptr(rsp->rda, *pos);
  66         return NULL;
  67 }
  68
  69 static void *r_next(struct seq_file *m, void *v, loff_t *pos)
  70 {
  71         (*pos)++;
  72         return r_start(m, pos);
  73 }
  74
  75 static void r_stop(struct seq_file *m, void *v)
  76 {
  77 }
  78
  79 static int show_rcubarrier(struct seq_file *m, void *unused)
  80 {
  81         struct rcu_state *rsp;
  82
  83         for_each_rcu_flavor(rsp)
  84                 seq_printf(m, "%s: bcc: %d nbd: %lu\n",
  85                            rsp->name,
  86                            atomic_read(&rsp->barrier_cpu_count),
  87                            rsp->n_barrier_done);
  88         return 0;
  89 }
  90
  91 static int rcubarrier_open(struct inode *inode, struct file *file)
  92 {
  93         return single_open(file, show_rcubarrier, NULL);
  94 }
  95
  96 static const struct file_operations rcubarrier_fops = {
  97         .owner = THIS_MODULE,
  98         .open = rcubarrier_open,
  99         .read = seq_read,
 100         .llseek = seq_lseek,
 101         .release = single_release,
 102 };
 103
 104 #ifdef CONFIG_RCU_BOOST
 105
 106 static char convert_kthread_status(unsigned int kthread_status)
 107 {
 108         if (kthread_status > RCU_KTHREAD_MAX)
 109                 return '?';
 110         return "SRWOY"[kthread_status];
 111 }
 112
 113 #endif /* #ifdef CONFIG_RCU_BOOST */
 114
 115 static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
 116 {
 117         if (!rdp->beenonline)
 118                 return;
 119         seq_printf(m, "%3d%cc=%lu g=%lu pq=%d qp=%d",
 120                    rdp->cpu,
 121                    cpu_is_offline(rdp->cpu) ? '!' : ' ',
 122                    rdp->completed, rdp->gpnum,
 123                    rdp->passed_quiesce, rdp->qs_pending);
 124         seq_printf(m, " dt=%d/%llx/%d df=%lu",
 125                    atomic_read(&rdp->dynticks->dynticks),
 126                    rdp->dynticks->dynticks_nesting,
 127                    rdp->dynticks->dynticks_nmi_nesting,
 128                    rdp->dynticks_fqs);
 129         seq_printf(m, " of=%lu", rdp->offline_fqs);
 130         seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c",
 131                    rdp->qlen_lazy, rdp->qlen,
 132                    ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
 133                         rdp->nxttail[RCU_NEXT_TAIL]],
 134                    ".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
 135                         rdp->nxttail[RCU_NEXT_READY_TAIL]],
 136                    ".W"[rdp->nxttail[RCU_DONE_TAIL] !=
 137                         rdp->nxttail[RCU_WAIT_TAIL]],
 138                    ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
 139 #ifdef CONFIG_RCU_BOOST
 140         seq_printf(m, " kt=%d/%c ktl=%x",
 141                    per_cpu(rcu_cpu_has_work, rdp->cpu),
 142                    convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
 143                                           rdp->cpu)),
 144                    per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff);
 145 #endif /* #ifdef CONFIG_RCU_BOOST */
 146         seq_printf(m, " b=%ld", rdp->blimit);
 147         seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
 148                    rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
 149 }
 150
 151 static int show_rcudata(struct seq_file *m, void *unused)
 152 {
 153         int cpu;
 154         struct rcu_state *rsp;
 155
 156         for_each_rcu_flavor(rsp) {
 157                 seq_printf(m, "%s:\n", rsp->name);
 158                 for_each_possible_cpu(cpu)
 159                         print_one_rcu_data(m, per_cpu_ptr(rsp->rda, cpu));
 160         }
 161         return 0;
 162 }
 163
 164 static int rcudata_open(struct inode *inode, struct file *file)
 165 {
 166         return single_open(file, show_rcudata, NULL);
 167 }
 168
 169 static const struct file_operations rcudata_fops = {
 170         .owner = THIS_MODULE,
 171         .open = rcudata_open,
 172         .read = seq_read,
 173         .llseek = seq_lseek,
 174         .release = single_release,
 175 };
 176
 177 static int new_show_rcudata(struct seq_file *m, void *v)
 178 {
 179         print_one_rcu_data(m, (struct rcu_data *)v);
 180         return 0;
 181 }
 182
 183 static const struct seq_operations new_rcudate_op = {
 184         .start = r_start,
 185         .next  = r_next,
 186         .stop  = r_stop,
 187         .show  = new_show_rcudata,
 188 };
 189
 190 static int new_rcudata_open(struct inode *inode, struct file *file)
 191 {
 192         return r_open(inode, file, &new_rcudate_op);
 193 }
 194
 195 static const struct file_operations new_rcudata_fops = {
 196         .owner = THIS_MODULE,
 197         .open = new_rcudata_open,
 198         .read = seq_read,
 199         .llseek = no_llseek,
 200         .release = seq_release,
 201 };
 202
 203 static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
 204 {
 205         if (!rdp->beenonline)
 206                 return;
 207         seq_printf(m, "%d,%s,%lu,%lu,%d,%d",
 208                    rdp->cpu,
 209                    cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
 210                    rdp->completed, rdp->gpnum,
 211                    rdp->passed_quiesce, rdp->qs_pending);
 212         seq_printf(m, ",%d,%llx,%d,%lu",
 213                    atomic_read(&rdp->dynticks->dynticks),
 214                    rdp->dynticks->dynticks_nesting,
 215                    rdp->dynticks->dynticks_nmi_nesting,
 216                    rdp->dynticks_fqs);
 217         seq_printf(m, ",%lu", rdp->offline_fqs);
 218         seq_printf(m, ",%ld,%ld,\"%c%c%c%c\"", rdp->qlen_lazy, rdp->qlen,
 219                    ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
 220                         rdp->nxttail[RCU_NEXT_TAIL]],
 221                    ".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
 222                         rdp->nxttail[RCU_NEXT_READY_TAIL]],
 223                    ".W"[rdp->nxttail[RCU_DONE_TAIL] !=
 224                         rdp->nxttail[RCU_WAIT_TAIL]],
 225                    ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
 226 #ifdef CONFIG_RCU_BOOST
 227         seq_printf(m, ",%d,\"%c\"",
 228                    per_cpu(rcu_cpu_has_work, rdp->cpu),
 229                    convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
 230                                           rdp->cpu)));
 231 #endif /* #ifdef CONFIG_RCU_BOOST */
 232         seq_printf(m, ",%ld", rdp->blimit);
 233         seq_printf(m, ",%lu,%lu,%lu\n",
 234                    rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
 235 }
 236
 237 static int show_rcudata_csv(struct seq_file *m, void *unused)
 238 {
 239         int cpu;
 240         struct rcu_state *rsp;
 241
 242         seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pq\",");
 243         seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\",");
 244         seq_puts(m, "\"of\",\"qll\",\"ql\",\"qs\"");
 245 #ifdef CONFIG_RCU_BOOST
 246         seq_puts(m, "\"kt\",\"ktl\"");
 247 #endif /* #ifdef CONFIG_RCU_BOOST */
 248         seq_puts(m, ",\"b\",\"ci\",\"co\",\"ca\"\n");
 249         for_each_rcu_flavor(rsp) {
 250                 seq_printf(m, "\"%s:\"\n", rsp->name);
 251                 for_each_possible_cpu(cpu)
 252                         print_one_rcu_data_csv(m, per_cpu_ptr(rsp->rda, cpu));
 253         }
 254         return 0;
 255 }
 256
 257 static int rcudata_csv_open(struct inode *inode, struct file *file)
 258 {
 259         return single_open(file, show_rcudata_csv, NULL);
 260 }
 261
 262 static const struct file_operations rcudata_csv_fops = {
 263         .owner = THIS_MODULE,
 264         .open = rcudata_csv_open,
 265         .read = seq_read,
 266         .llseek = seq_lseek,
 267         .release = single_release,
 268 };
 269
 270 static int new_show_rcudata_csv(struct seq_file *m, void *v)
 271 {
 272         struct rcu_data *rdp = (struct rcu_data *)v;
 273         if (cpumask_first(cpu_possible_mask) == rdp->cpu) {
 274                 seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pq\",");
 275                 seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\",");
 276                 seq_puts(m, "\"of\",\"qll\",\"ql\",\"qs\"");
 277 #ifdef CONFIG_RCU_BOOST
 278                 seq_puts(m, "\"kt\",\"ktl\"");
 279 #endif /* #ifdef CONFIG_RCU_BOOST */
 280                 seq_puts(m, ",\"b\",\"ci\",\"co\",\"ca\"\n");
 281         }
 282
 283         print_one_rcu_data_csv(m, rdp);
 284         return 0;
 285 }
 286
 287 static const struct seq_operations new_rcudate_csv_op = {
 288         .start = r_start,
 289         .next  = r_next,
 290         .stop  = r_stop,
 291         .show  = new_show_rcudata_csv,
 292 };
 293
 294 static int new_rcudata_csv_open(struct inode *inode, struct file *file)
 295 {
 296         return r_open(inode, file, &new_rcudate_csv_op);
 297 }
 298
 299 static const struct file_operations new_rcudata_csv_fops = {
 300         .owner = THIS_MODULE,
 301         .open = new_rcudata_csv_open,
 302         .read = seq_read,
 303         .llseek = no_llseek,
 304         .release = seq_release,
 305 };
 306
 307 #ifdef CONFIG_RCU_BOOST
 308
 309 static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp)
 310 {
 311         seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ",
 312                    rnp->grplo, rnp->grphi,
 313                    "T."[list_empty(&rnp->blkd_tasks)],
 314                    "N."[!rnp->gp_tasks],
 315                    "E."[!rnp->exp_tasks],
 316                    "B."[!rnp->boost_tasks],
 317                    convert_kthread_status(rnp->boost_kthread_status),
 318                    rnp->n_tasks_boosted, rnp->n_exp_boosts,
 319                    rnp->n_normal_boosts);
 320         seq_printf(m, "j=%04x bt=%04x\n",
 321                    (int)(jiffies & 0xffff),
 322                    (int)(rnp->boost_time & 0xffff));
 323         seq_printf(m, "    balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
 324                    rnp->n_balk_blkd_tasks,
 325                    rnp->n_balk_exp_gp_tasks,
 326                    rnp->n_balk_boost_tasks,
 327                    rnp->n_balk_notblocked,
 328                    rnp->n_balk_notyet,
 329                    rnp->n_balk_nos);
 330 }
 331
 332 static int show_rcu_node_boost(struct seq_file *m, void *unused)
 333 {
 334         struct rcu_node *rnp;
 335
 336         rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
 337                 print_one_rcu_node_boost(m, rnp);
 338         return 0;
 339 }
 340
 341 static int rcu_node_boost_open(struct inode *inode, struct file *file)
 342 {
 343         return single_open(file, show_rcu_node_boost, NULL);
 344 }
 345
 346 static const struct file_operations rcu_node_boost_fops = {
 347         .owner = THIS_MODULE,
 348         .open = rcu_node_boost_open,
 349         .read = seq_read,
 350         .llseek = seq_lseek,
 351         .release = single_release,
 352 };
 353
 354 /*
 355  * Create the rcuboost debugfs entry.  Standard error return.
 356  */
 357 static int rcu_boost_trace_create_file(struct dentry *rcudir)
 358 {
 359         return !debugfs_create_file("rcuboost", 0444, rcudir, NULL,
 360                                     &rcu_node_boost_fops);
 361 }
 362
 363 #else /* #ifdef CONFIG_RCU_BOOST */
 364
 365 static int rcu_boost_trace_create_file(struct dentry *rcudir)
 366 {
 367         return 0;  /* There cannot be an error if we didn't create it! */
 368 }
 369
 370 #endif /* #else #ifdef CONFIG_RCU_BOOST */
 371
 372 static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
 373 {
 374         unsigned long gpnum;
 375         int level = 0;
 376         struct rcu_node *rnp;
 377
 378         gpnum = rsp->gpnum;
 379         seq_printf(m, "%s: c=%lu g=%lu s=%d jfq=%ld j=%x ",
 380                    rsp->name, rsp->completed, gpnum, rsp->fqs_state,
 381                    (long)(rsp->jiffies_force_qs - jiffies),
 382                    (int)(jiffies & 0xffff));
 383         seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n",
 384                    rsp->n_force_qs, rsp->n_force_qs_ngp,
 385                    rsp->n_force_qs - rsp->n_force_qs_ngp,
 386                    rsp->n_force_qs_lh, rsp->qlen_lazy, rsp->qlen);
 387         for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) {
 388                 if (rnp->level != level) {
 389                         seq_puts(m, "\n");
 390                         level = rnp->level;
 391                 }
 392                 seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d    ",
 393                            rnp->qsmask, rnp->qsmaskinit,
 394                            ".G"[rnp->gp_tasks != NULL],
 395                            ".E"[rnp->exp_tasks != NULL],
 396                            ".T"[!list_empty(&rnp->blkd_tasks)],
 397                            rnp->grplo, rnp->grphi, rnp->grpnum);
 398         }
 399         seq_puts(m, "\n");
 400 }
 401
 402 static int show_rcuhier(struct seq_file *m, void *unused)
 403 {
 404         struct rcu_state *rsp;
 405
 406         for_each_rcu_flavor(rsp)
 407                 print_one_rcu_state(m, rsp);
 408         return 0;
 409 }
 410
 411 static int rcuhier_open(struct inode *inode, struct file *file)
 412 {
 413         return single_open(file, show_rcuhier, NULL);
 414 }
 415
 416 static const struct file_operations rcuhier_fops = {
 417         .owner = THIS_MODULE,
 418         .open = rcuhier_open,
 419         .read = seq_read,
 420         .llseek = seq_lseek,
 421         .release = single_release,
 422 };
 423
 424 static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp)
 425 {
 426         unsigned long flags;
 427         unsigned long completed;
 428         unsigned long gpnum;
 429         unsigned long gpage;
 430         unsigned long gpmax;
 431         struct rcu_node *rnp = &rsp->node[0];
 432
 433         raw_spin_lock_irqsave(&rnp->lock, flags);
 434         completed = rsp->completed;
 435         gpnum = rsp->gpnum;
 436         if (rsp->completed == rsp->gpnum)
 437                 gpage = 0;
 438         else
 439                 gpage = jiffies - rsp->gp_start;
 440         gpmax = rsp->gp_max;
 441         raw_spin_unlock_irqrestore(&rnp->lock, flags);
 442         seq_printf(m, "%s: completed=%ld  gpnum=%lu  age=%ld  max=%ld\n",
 443                    rsp->name, completed, gpnum, gpage, gpmax);
 444 }
 445
 446 static int show_rcugp(struct seq_file *m, void *unused)
 447 {
 448         struct rcu_state *rsp;
 449
 450         for_each_rcu_flavor(rsp)
 451                 show_one_rcugp(m, rsp);
 452         return 0;
 453 }
 454
 455 static int rcugp_open(struct inode *inode, struct file *file)
 456 {
 457         return single_open(file, show_rcugp, NULL);
 458 }
 459
 460 static const struct file_operations rcugp_fops = {
 461         .owner = THIS_MODULE,
 462         .open = rcugp_open,
 463         .read = seq_read,
 464         .llseek = seq_lseek,
 465         .release = single_release,
 466 };
 467
 468 static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp)
 469 {
 470         if (!rdp->beenonline)
 471                 return;
 472         seq_printf(m, "%3d%cnp=%ld ",
 473                    rdp->cpu,
 474                    cpu_is_offline(rdp->cpu) ? '!' : ' ',
 475                    rdp->n_rcu_pending);
 476         seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ",
 477                    rdp->n_rp_qs_pending,
 478                    rdp->n_rp_report_qs,
 479                    rdp->n_rp_cb_ready,
 480                    rdp->n_rp_cpu_needs_gp);
 481         seq_printf(m, "gpc=%ld gps=%ld nn=%ld\n",
 482                    rdp->n_rp_gp_completed,
 483                    rdp->n_rp_gp_started,
 484                    rdp->n_rp_need_nothing);
 485 }
 486
 487 static int show_rcu_pending(struct seq_file *m, void *unused)
 488 {
 489         int cpu;
 490         struct rcu_state *rsp;
 491
 492         for_each_rcu_flavor(rsp) {
 493                 seq_printf(m, "%s:\n", rsp->name);
 494                 for_each_possible_cpu(cpu)
 495                         print_one_rcu_pending(m, per_cpu_ptr(rsp->rda, cpu));
 496         }
 497         return 0;
 498 }
 499
 500 static int rcu_pending_open(struct inode *inode, struct file *file)
 501 {
 502         return single_open(file, show_rcu_pending, NULL);
 503 }
 504
 505 static const struct file_operations rcu_pending_fops = {
 506         .owner = THIS_MODULE,
 507         .open = rcu_pending_open,
 508         .read = seq_read,
 509         .llseek = seq_lseek,
 510         .release = single_release,
 511 };
 512
 513 static int new_show_rcu_pending(struct seq_file *m, void *v)
 514 {
 515         print_one_rcu_pending(m, (struct rcu_data *)v);
 516         return 0;
 517 }
 518
 519 static const struct seq_operations new_rcu_pending_op = {
 520         .start = r_start,
 521         .next  = r_next,
 522         .stop  = r_stop,
 523         .show  = new_show_rcu_pending,
 524 };
 525
 526 static int new_rcu_pending_open(struct inode *inode, struct file *file)
 527 {
 528         return r_open(inode, file, &new_rcu_pending_op);
 529 }
 530
 531 static const struct file_operations new_rcu_pending_fops = {
 532         .owner = THIS_MODULE,
 533         .open = new_rcu_pending_open,
 534         .read = seq_read,
 535         .llseek = no_llseek,
 536         .release = seq_release,
 537 };
 538
 539 static int show_rcutorture(struct seq_file *m, void *unused)
 540 {
 541         seq_printf(m, "rcutorture test sequence: %lu %s\n",
 542                    rcutorture_testseq >> 1,
 543                    (rcutorture_testseq & 0x1) ? "(test in progress)" : "");
 544         seq_printf(m, "rcutorture update version number: %lu\n",
 545                    rcutorture_vernum);
 546         return 0;
 547 }
 548
 549 static int rcutorture_open(struct inode *inode, struct file *file)
 550 {
 551         return single_open(file, show_rcutorture, NULL);
 552 }
 553
 554 static const struct file_operations rcutorture_fops = {
 555         .owner = THIS_MODULE,
 556         .open = rcutorture_open,
 557         .read = seq_read,
 558         .llseek = seq_lseek,
 559         .release = single_release,
 560 };
 561
 562 static struct dentry *rcudir;
 563
 564 static int __init rcutree_trace_init(void)
 565 {
 566         struct rcu_state *rsp;
 567         struct dentry *retval;
 568         struct dentry *rspdir;
 569
 570         rcudir = debugfs_create_dir("rcu", NULL);
 571         if (!rcudir)
 572                 goto free_out;
 573
 574         for_each_rcu_flavor(rsp) {
 575                 rspdir = debugfs_create_dir(rsp->name, rcudir);
 576                 if (!rspdir)
 577                         goto free_out;
 578
 579                         retval = debugfs_create_file("rcudata", 0444,
 580                                         rspdir, rsp, &new_rcudata_fops);
 581                         if (!retval)
 582                                 goto free_out;
 583
 584                         retval = debugfs_create_file("rcudata.csv", 0444,
 585                                         rspdir, rsp, &new_rcudata_csv_fops);
 586                         if (!retval)
 587                                 goto free_out;
 588
 589                         retval = debugfs_create_file("rcu_pending", 0444,
 590                                         rspdir, rsp, &new_rcu_pending_fops);
 591                         if (!retval)
 592                                 goto free_out;
 593         }
 594
 595         retval = debugfs_create_file("rcubarrier", 0444, rcudir,
 596                                                 NULL, &rcubarrier_fops);
 597         if (!retval)
 598                 goto free_out;
 599
 600         retval = debugfs_create_file("rcudata", 0444, rcudir,
 601                                                 NULL, &rcudata_fops);
 602         if (!retval)
 603                 goto free_out;
 604
 605         retval = debugfs_create_file("rcudata.csv", 0444, rcudir,
 606                                                 NULL, &rcudata_csv_fops);
 607         if (!retval)
 608                 goto free_out;
 609
 610         if (rcu_boost_trace_create_file(rcudir))
 611                 goto free_out;
 612
 613         retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
 614         if (!retval)
 615                 goto free_out;
 616
 617         retval = debugfs_create_file("rcuhier", 0444, rcudir,
 618                                                 NULL, &rcuhier_fops);
 619         if (!retval)
 620                 goto free_out;
 621
 622         retval = debugfs_create_file("rcu_pending", 0444, rcudir,
 623                                                 NULL, &rcu_pending_fops);
 624         if (!retval)
 625                 goto free_out;
 626
 627         retval = debugfs_create_file("rcutorture", 0444, rcudir,
 628                                                 NULL, &rcutorture_fops);
 629         if (!retval)
 630                 goto free_out;
 631         return 0;
 632 free_out:
 633         debugfs_remove_recursive(rcudir);
 634         return 1;
 635 }
 636
 637 static void __exit rcutree_trace_cleanup(void)
 638 {
 639         debugfs_remove_recursive(rcudir);
 640 }
 641
 642
 643 module_init(rcutree_trace_init);
 644 module_exit(rcutree_trace_cleanup);
 645
 646 MODULE_AUTHOR("Paul E. McKenney");
 647 MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
 648 MODULE_LICENSE("GPL");