rcutree_trace.c

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    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 #define ulong2long(a) (*(long *)(&(a)))
   50 
   51 static int r_open(struct inode *inode, struct file *file,
   52                                         const struct seq_operations *op)
   53 {
   54         int ret = seq_open(file, op);
   55         if (!ret) {
   56                 struct seq_file *m = (struct seq_file *)file->private_data;
   57                 m->private = inode->i_private;
   58         }
   59         return ret;
   60 }
   61 
   62 static void *r_start(struct seq_file *m, loff_t *pos)
   63 {
   64         struct rcu_state *rsp = (struct rcu_state *)m->private;
   65         *pos = cpumask_next(*pos - 1, cpu_possible_mask);
   66         if ((*pos) < nr_cpu_ids)
   67                 return per_cpu_ptr(rsp->rda, *pos);
   68         return NULL;
   69 }
   70 
   71 static void *r_next(struct seq_file *m, void *v, loff_t *pos)
   72 {
   73         (*pos)++;
   74         return r_start(m, pos);
   75 }
   76 
   77 static void r_stop(struct seq_file *m, void *v)
   78 {
   79 }
   80 
   81 static int show_rcubarrier(struct seq_file *m, void *v)
   82 {
   83         struct rcu_state *rsp = (struct rcu_state *)m->private;
   84         seq_printf(m, "bcc: %d nbd: %lu\n",
   85                    atomic_read(&rsp->barrier_cpu_count),
   86                    rsp->n_barrier_done);
   87         return 0;
   88 }
   89 
   90 static int rcubarrier_open(struct inode *inode, struct file *file)
   91 {
   92         return single_open(file, show_rcubarrier, inode->i_private);
   93 }
   94 
   95 static const struct file_operations rcubarrier_fops = {
   96         .owner = THIS_MODULE,
   97         .open = rcubarrier_open,
   98         .read = seq_read,
   99         .llseek = no_llseek,
  100         .release = seq_release,
  101 };
  102 
  103 #ifdef CONFIG_RCU_BOOST
  104 
  105 static char convert_kthread_status(unsigned int kthread_status)
  106 {
  107         if (kthread_status > RCU_KTHREAD_MAX)
  108                 return '?';
  109         return "SRWOY"[kthread_status];
  110 }
  111 
  112 #endif /* #ifdef CONFIG_RCU_BOOST */
  113 
  114 static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
  115 {
  116         long ql, qll;
  117 
  118         if (!rdp->beenonline)
  119                 return;
  120         seq_printf(m, "%3d%cc=%ld g=%ld pq=%d qp=%d",
  121                    rdp->cpu,
  122                    cpu_is_offline(rdp->cpu) ? '!' : ' ',
  123                    ulong2long(rdp->completed), ulong2long(rdp->gpnum),
  124                    rdp->passed_quiesce, rdp->qs_pending);
  125         seq_printf(m, " dt=%d/%llx/%d df=%lu",
  126                    atomic_read(&rdp->dynticks->dynticks),
  127                    rdp->dynticks->dynticks_nesting,
  128                    rdp->dynticks->dynticks_nmi_nesting,
  129                    rdp->dynticks_fqs);
  130         seq_printf(m, " of=%lu", rdp->offline_fqs);
  131         rcu_nocb_q_lengths(rdp, &ql, &qll);
  132         qll += rdp->qlen_lazy;
  133         ql += rdp->qlen;
  134         seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c",
  135                    qll, ql,
  136                    ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
  137                         rdp->nxttail[RCU_NEXT_TAIL]],
  138                    ".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
  139                         rdp->nxttail[RCU_NEXT_READY_TAIL]],
  140                    ".W"[rdp->nxttail[RCU_DONE_TAIL] !=
  141                         rdp->nxttail[RCU_WAIT_TAIL]],
  142                    ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
  143 #ifdef CONFIG_RCU_BOOST
  144         seq_printf(m, " kt=%d/%c ktl=%x",
  145                    per_cpu(rcu_cpu_has_work, rdp->cpu),
  146                    convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
  147                                           rdp->cpu)),
  148                    per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff);
  149 #endif /* #ifdef CONFIG_RCU_BOOST */
  150         seq_printf(m, " b=%ld", rdp->blimit);
  151         seq_printf(m, " ci=%lu nci=%lu co=%lu ca=%lu\n",
  152                    rdp->n_cbs_invoked, rdp->n_nocbs_invoked,
  153                    rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
  154 }
  155 
  156 static int show_rcudata(struct seq_file *m, void *v)
  157 {
  158         print_one_rcu_data(m, (struct rcu_data *)v);
  159         return 0;
  160 }
  161 
  162 static const struct seq_operations rcudate_op = {
  163         .start = r_start,
  164         .next  = r_next,
  165         .stop  = r_stop,
  166         .show  = show_rcudata,
  167 };
  168 
  169 static int rcudata_open(struct inode *inode, struct file *file)
  170 {
  171         return r_open(inode, file, &rcudate_op);
  172 }
  173 
  174 static const struct file_operations rcudata_fops = {
  175         .owner = THIS_MODULE,
  176         .open = rcudata_open,
  177         .read = seq_read,
  178         .llseek = no_llseek,
  179         .release = seq_release,
  180 };
  181 
  182 static int show_rcuexp(struct seq_file *m, void *v)
  183 {
  184         struct rcu_state *rsp = (struct rcu_state *)m->private;
  185 
  186         seq_printf(m, "s=%lu d=%lu w=%lu tf=%lu wd1=%lu wd2=%lu n=%lu sc=%lu dt=%lu dl=%lu dx=%lu\n",
  187                    atomic_long_read(&rsp->expedited_start),
  188                    atomic_long_read(&rsp->expedited_done),
  189                    atomic_long_read(&rsp->expedited_wrap),
  190                    atomic_long_read(&rsp->expedited_tryfail),
  191                    atomic_long_read(&rsp->expedited_workdone1),
  192                    atomic_long_read(&rsp->expedited_workdone2),
  193                    atomic_long_read(&rsp->expedited_normal),
  194                    atomic_long_read(&rsp->expedited_stoppedcpus),
  195                    atomic_long_read(&rsp->expedited_done_tries),
  196                    atomic_long_read(&rsp->expedited_done_lost),
  197                    atomic_long_read(&rsp->expedited_done_exit));
  198         return 0;
  199 }
  200 
  201 static int rcuexp_open(struct inode *inode, struct file *file)
  202 {
  203         return single_open(file, show_rcuexp, inode->i_private);
  204 }
  205 
  206 static const struct file_operations rcuexp_fops = {
  207         .owner = THIS_MODULE,
  208         .open = rcuexp_open,
  209         .read = seq_read,
  210         .llseek = no_llseek,
  211         .release = seq_release,
  212 };
  213 
  214 #ifdef CONFIG_RCU_BOOST
  215 
  216 static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp)
  217 {
  218         seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ",
  219                    rnp->grplo, rnp->grphi,
  220                    "T."[list_empty(&rnp->blkd_tasks)],
  221                    "N."[!rnp->gp_tasks],
  222                    "E."[!rnp->exp_tasks],
  223                    "B."[!rnp->boost_tasks],
  224                    convert_kthread_status(rnp->boost_kthread_status),
  225                    rnp->n_tasks_boosted, rnp->n_exp_boosts,
  226                    rnp->n_normal_boosts);
  227         seq_printf(m, "j=%04x bt=%04x\n",
  228                    (int)(jiffies & 0xffff),
  229                    (int)(rnp->boost_time & 0xffff));
  230         seq_printf(m, "    balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
  231                    rnp->n_balk_blkd_tasks,
  232                    rnp->n_balk_exp_gp_tasks,
  233                    rnp->n_balk_boost_tasks,
  234                    rnp->n_balk_notblocked,
  235                    rnp->n_balk_notyet,
  236                    rnp->n_balk_nos);
  237 }
  238 
  239 static int show_rcu_node_boost(struct seq_file *m, void *unused)
  240 {
  241         struct rcu_node *rnp;
  242 
  243         rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
  244                 print_one_rcu_node_boost(m, rnp);
  245         return 0;
  246 }
  247 
  248 static int rcu_node_boost_open(struct inode *inode, struct file *file)
  249 {
  250         return single_open(file, show_rcu_node_boost, NULL);
  251 }
  252 
  253 static const struct file_operations rcu_node_boost_fops = {
  254         .owner = THIS_MODULE,
  255         .open = rcu_node_boost_open,
  256         .read = seq_read,
  257         .llseek = no_llseek,
  258         .release = single_release,
  259 };
  260 
  261 #endif /* #ifdef CONFIG_RCU_BOOST */
  262 
  263 static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
  264 {
  265         unsigned long gpnum;
  266         int level = 0;
  267         struct rcu_node *rnp;
  268 
  269         gpnum = rsp->gpnum;
  270         seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x ",
  271                    ulong2long(rsp->completed), ulong2long(gpnum),
  272                    rsp->fqs_state,
  273                    (long)(rsp->jiffies_force_qs - jiffies),
  274                    (int)(jiffies & 0xffff));
  275         seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n",
  276                    rsp->n_force_qs, rsp->n_force_qs_ngp,
  277                    rsp->n_force_qs - rsp->n_force_qs_ngp,
  278                    rsp->n_force_qs_lh, rsp->qlen_lazy, rsp->qlen);
  279         for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) {
  280                 if (rnp->level != level) {
  281                         seq_puts(m, "\n");
  282                         level = rnp->level;
  283                 }
  284                 seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d    ",
  285                            rnp->qsmask, rnp->qsmaskinit,
  286                            ".G"[rnp->gp_tasks != NULL],
  287                            ".E"[rnp->exp_tasks != NULL],
  288                            ".T"[!list_empty(&rnp->blkd_tasks)],
  289                            rnp->grplo, rnp->grphi, rnp->grpnum);
  290         }
  291         seq_puts(m, "\n");
  292 }
  293 
  294 static int show_rcuhier(struct seq_file *m, void *v)
  295 {
  296         struct rcu_state *rsp = (struct rcu_state *)m->private;
  297         print_one_rcu_state(m, rsp);
  298         return 0;
  299 }
  300 
  301 static int rcuhier_open(struct inode *inode, struct file *file)
  302 {
  303         return single_open(file, show_rcuhier, inode->i_private);
  304 }
  305 
  306 static const struct file_operations rcuhier_fops = {
  307         .owner = THIS_MODULE,
  308         .open = rcuhier_open,
  309         .read = seq_read,
  310         .llseek = no_llseek,
  311         .release = seq_release,
  312 };
  313 
  314 static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp)
  315 {
  316         unsigned long flags;
  317         unsigned long completed;
  318         unsigned long gpnum;
  319         unsigned long gpage;
  320         unsigned long gpmax;
  321         struct rcu_node *rnp = &rsp->node[0];
  322 
  323         raw_spin_lock_irqsave(&rnp->lock, flags);
  324         completed = ACCESS_ONCE(rsp->completed);
  325         gpnum = ACCESS_ONCE(rsp->gpnum);
  326         if (completed == gpnum)
  327                 gpage = 0;
  328         else
  329                 gpage = jiffies - rsp->gp_start;
  330         gpmax = rsp->gp_max;
  331         raw_spin_unlock_irqrestore(&rnp->lock, flags);
  332         seq_printf(m, "completed=%ld  gpnum=%ld  age=%ld  max=%ld\n",
  333                    ulong2long(completed), ulong2long(gpnum), gpage, gpmax);
  334 }
  335 
  336 static int show_rcugp(struct seq_file *m, void *v)
  337 {
  338         struct rcu_state *rsp = (struct rcu_state *)m->private;
  339         show_one_rcugp(m, rsp);
  340         return 0;
  341 }
  342 
  343 static int rcugp_open(struct inode *inode, struct file *file)
  344 {
  345         return single_open(file, show_rcugp, inode->i_private);
  346 }
  347 
  348 static const struct file_operations rcugp_fops = {
  349         .owner = THIS_MODULE,
  350         .open = rcugp_open,
  351         .read = seq_read,
  352         .llseek = no_llseek,
  353         .release = seq_release,
  354 };
  355 
  356 static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp)
  357 {
  358         if (!rdp->beenonline)
  359                 return;
  360         seq_printf(m, "%3d%cnp=%ld ",
  361                    rdp->cpu,
  362                    cpu_is_offline(rdp->cpu) ? '!' : ' ',
  363                    rdp->n_rcu_pending);
  364         seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ",
  365                    rdp->n_rp_qs_pending,
  366                    rdp->n_rp_report_qs,
  367                    rdp->n_rp_cb_ready,
  368                    rdp->n_rp_cpu_needs_gp);
  369         seq_printf(m, "gpc=%ld gps=%ld nn=%ld\n",
  370                    rdp->n_rp_gp_completed,
  371                    rdp->n_rp_gp_started,
  372                    rdp->n_rp_need_nothing);
  373 }
  374 
  375 static int show_rcu_pending(struct seq_file *m, void *v)
  376 {
  377         print_one_rcu_pending(m, (struct rcu_data *)v);
  378         return 0;
  379 }
  380 
  381 static const struct seq_operations rcu_pending_op = {
  382         .start = r_start,
  383         .next  = r_next,
  384         .stop  = r_stop,
  385         .show  = show_rcu_pending,
  386 };
  387 
  388 static int rcu_pending_open(struct inode *inode, struct file *file)
  389 {
  390         return r_open(inode, file, &rcu_pending_op);
  391 }
  392 
  393 static const struct file_operations rcu_pending_fops = {
  394         .owner = THIS_MODULE,
  395         .open = rcu_pending_open,
  396         .read = seq_read,
  397         .llseek = no_llseek,
  398         .release = seq_release,
  399 };
  400 
  401 static int show_rcutorture(struct seq_file *m, void *unused)
  402 {
  403         seq_printf(m, "rcutorture test sequence: %lu %s\n",
  404                    rcutorture_testseq >> 1,
  405                    (rcutorture_testseq & 0x1) ? "(test in progress)" : "");
  406         seq_printf(m, "rcutorture update version number: %lu\n",
  407                    rcutorture_vernum);
  408         return 0;
  409 }
  410 
  411 static int rcutorture_open(struct inode *inode, struct file *file)
  412 {
  413         return single_open(file, show_rcutorture, NULL);
  414 }
  415 
  416 static const struct file_operations rcutorture_fops = {
  417         .owner = THIS_MODULE,
  418         .open = rcutorture_open,
  419         .read = seq_read,
  420         .llseek = seq_lseek,
  421         .release = single_release,
  422 };
  423 
  424 static struct dentry *rcudir;
  425 
  426 static int __init rcutree_trace_init(void)
  427 {
  428         struct rcu_state *rsp;
  429         struct dentry *retval;
  430         struct dentry *rspdir;
  431 
  432         rcudir = debugfs_create_dir("rcu", NULL);
  433         if (!rcudir)
  434                 goto free_out;
  435 
  436         for_each_rcu_flavor(rsp) {
  437                 rspdir = debugfs_create_dir(rsp->name, rcudir);
  438                 if (!rspdir)
  439                         goto free_out;
  440 
  441                 retval = debugfs_create_file("rcudata", 0444,
  442                                 rspdir, rsp, &rcudata_fops);
  443                 if (!retval)
  444                         goto free_out;
  445 
  446                 retval = debugfs_create_file("rcuexp", 0444,
  447                                 rspdir, rsp, &rcuexp_fops);
  448                 if (!retval)
  449                         goto free_out;
  450 
  451                 retval = debugfs_create_file("rcu_pending", 0444,
  452                                 rspdir, rsp, &rcu_pending_fops);
  453                 if (!retval)
  454                         goto free_out;
  455 
  456                 retval = debugfs_create_file("rcubarrier", 0444,
  457                                 rspdir, rsp, &rcubarrier_fops);
  458                 if (!retval)
  459                         goto free_out;
  460 
  461 #ifdef CONFIG_RCU_BOOST
  462                 if (rsp == &rcu_preempt_state) {
  463                         retval = debugfs_create_file("rcuboost", 0444,
  464                                 rspdir, NULL, &rcu_node_boost_fops);
  465                         if (!retval)
  466                                 goto free_out;
  467                 }
  468 #endif
  469 
  470                 retval = debugfs_create_file("rcugp", 0444,
  471                                 rspdir, rsp, &rcugp_fops);
  472                 if (!retval)
  473                         goto free_out;
  474 
  475                 retval = debugfs_create_file("rcuhier", 0444,
  476                                 rspdir, rsp, &rcuhier_fops);
  477                 if (!retval)
  478                         goto free_out;
  479         }
  480 
  481         retval = debugfs_create_file("rcutorture", 0444, rcudir,
  482                                                 NULL, &rcutorture_fops);
  483         if (!retval)
  484                 goto free_out;
  485         return 0;
  486 free_out:
  487         debugfs_remove_recursive(rcudir);
  488         return 1;
  489 }
  490 
  491 static void __exit rcutree_trace_cleanup(void)
  492 {
  493         debugfs_remove_recursive(rcudir);
  494 }
  495 
  496 
  497 module_init(rcutree_trace_init);
  498 module_exit(rcutree_trace_cleanup);
  499 
  500 MODULE_AUTHOR("Paul E. McKenney");
  501 MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
  502 MODULE_LICENSE("GPL");
Cache object: 2897a53c694030b8da906be005ab9889
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FreeBSD/Linux Kernel Cross Reference sys/kernel/rcutree_trace.c

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sys/kernel/rcutree_trace.c
