+++ /dev/null
-/*
- * Read-Copy Update tracing for classic implementation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * Copyright IBM Corporation, 2008
- *
- * Papers: http://www.rdrop.com/users/paulmck/RCU
- *
- * For detailed explanation of Read-Copy Update mechanism see -
- * Documentation/RCU
- *
- */
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-#include <linux/smp.h>
-#include <linux/rcupdate.h>
-#include <linux/interrupt.h>
-#include <linux/sched.h>
-#include <linux/atomic.h>
-#include <linux/bitops.h>
-#include <linux/module.h>
-#include <linux/completion.h>
-#include <linux/moduleparam.h>
-#include <linux/percpu.h>
-#include <linux/notifier.h>
-#include <linux/cpu.h>
-#include <linux/mutex.h>
-#include <linux/debugfs.h>
-#include <linux/seq_file.h>
-
-#define RCU_TREE_NONCORE
-#include "rcutree.h"
-
-static int r_open(struct inode *inode, struct file *file,
- const struct seq_operations *op)
-{
- int ret = seq_open(file, op);
- if (!ret) {
- struct seq_file *m = (struct seq_file *)file->private_data;
- m->private = inode->i_private;
- }
- return ret;
-}
-
-static void *r_start(struct seq_file *m, loff_t *pos)
-{
- struct rcu_state *rsp = (struct rcu_state *)m->private;
- *pos = cpumask_next(*pos - 1, cpu_possible_mask);
- if ((*pos) < nr_cpu_ids)
- return per_cpu_ptr(rsp->rda, *pos);
- return NULL;
-}
-
-static void *r_next(struct seq_file *m, void *v, loff_t *pos)
-{
- (*pos)++;
- return r_start(m, pos);
-}
-
-static void r_stop(struct seq_file *m, void *v)
-{
-}
-
-static int show_rcubarrier(struct seq_file *m, void *v)
-{
- struct rcu_state *rsp = (struct rcu_state *)m->private;
- seq_printf(m, "bcc: %d nbd: %lu\n",
- atomic_read(&rsp->barrier_cpu_count),
- rsp->n_barrier_done);
- return 0;
-}
-
-static int rcubarrier_open(struct inode *inode, struct file *file)
-{
- return single_open(file, show_rcubarrier, inode->i_private);
-}
-
-static const struct file_operations rcubarrier_fops = {
- .owner = THIS_MODULE,
- .open = rcubarrier_open,
- .read = seq_read,
- .llseek = no_llseek,
- .release = single_release,
-};
-
-#ifdef CONFIG_RCU_BOOST
-
-static char convert_kthread_status(unsigned int kthread_status)
-{
- if (kthread_status > RCU_KTHREAD_MAX)
- return '?';
- return "SRWOY"[kthread_status];
-}
-
-#endif /* #ifdef CONFIG_RCU_BOOST */
-
-static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
-{
- long ql, qll;
-
- if (!rdp->beenonline)
- return;
- seq_printf(m, "%3d%cc=%ld g=%ld pq=%d qp=%d",
- rdp->cpu,
- cpu_is_offline(rdp->cpu) ? '!' : ' ',
- ulong2long(rdp->completed), ulong2long(rdp->gpnum),
- rdp->passed_quiesce, rdp->qs_pending);
- seq_printf(m, " dt=%d/%llx/%d df=%lu",
- atomic_read(&rdp->dynticks->dynticks),
- rdp->dynticks->dynticks_nesting,
- rdp->dynticks->dynticks_nmi_nesting,
- rdp->dynticks_fqs);
- seq_printf(m, " of=%lu", rdp->offline_fqs);
- rcu_nocb_q_lengths(rdp, &ql, &qll);
- qll += rdp->qlen_lazy;
- ql += rdp->qlen;
- seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c",
- qll, ql,
- ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
- rdp->nxttail[RCU_NEXT_TAIL]],
- ".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
- rdp->nxttail[RCU_NEXT_READY_TAIL]],
- ".W"[rdp->nxttail[RCU_DONE_TAIL] !=
- rdp->nxttail[RCU_WAIT_TAIL]],
- ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
-#ifdef CONFIG_RCU_BOOST
- seq_printf(m, " kt=%d/%c ktl=%x",
- per_cpu(rcu_cpu_has_work, rdp->cpu),
- convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
- rdp->cpu)),
- per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff);
-#endif /* #ifdef CONFIG_RCU_BOOST */
- seq_printf(m, " b=%ld", rdp->blimit);
- seq_printf(m, " ci=%lu nci=%lu co=%lu ca=%lu\n",
- rdp->n_cbs_invoked, rdp->n_nocbs_invoked,
- rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
-}
-
-static int show_rcudata(struct seq_file *m, void *v)
-{
- print_one_rcu_data(m, (struct rcu_data *)v);
- return 0;
-}
-
-static const struct seq_operations rcudate_op = {
- .start = r_start,
- .next = r_next,
- .stop = r_stop,
- .show = show_rcudata,
-};
-
-static int rcudata_open(struct inode *inode, struct file *file)
-{
- return r_open(inode, file, &rcudate_op);
-}
-
-static const struct file_operations rcudata_fops = {
- .owner = THIS_MODULE,
- .open = rcudata_open,
- .read = seq_read,
- .llseek = no_llseek,
- .release = seq_release,
-};
-
-static int show_rcuexp(struct seq_file *m, void *v)
-{
- struct rcu_state *rsp = (struct rcu_state *)m->private;
-
- 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",
- atomic_long_read(&rsp->expedited_start),
- atomic_long_read(&rsp->expedited_done),
- atomic_long_read(&rsp->expedited_wrap),
- atomic_long_read(&rsp->expedited_tryfail),
- atomic_long_read(&rsp->expedited_workdone1),
- atomic_long_read(&rsp->expedited_workdone2),
- atomic_long_read(&rsp->expedited_normal),
- atomic_long_read(&rsp->expedited_stoppedcpus),
- atomic_long_read(&rsp->expedited_done_tries),
- atomic_long_read(&rsp->expedited_done_lost),
- atomic_long_read(&rsp->expedited_done_exit));
- return 0;
-}
-
-static int rcuexp_open(struct inode *inode, struct file *file)
-{
- return single_open(file, show_rcuexp, inode->i_private);
-}
-
-static const struct file_operations rcuexp_fops = {
- .owner = THIS_MODULE,
- .open = rcuexp_open,
- .read = seq_read,
- .llseek = no_llseek,
- .release = single_release,
-};
-
-#ifdef CONFIG_RCU_BOOST
-
-static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp)
-{
- seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ",
- rnp->grplo, rnp->grphi,
- "T."[list_empty(&rnp->blkd_tasks)],
- "N."[!rnp->gp_tasks],
- "E."[!rnp->exp_tasks],
- "B."[!rnp->boost_tasks],
- convert_kthread_status(rnp->boost_kthread_status),
- rnp->n_tasks_boosted, rnp->n_exp_boosts,
- rnp->n_normal_boosts);
- seq_printf(m, "j=%04x bt=%04x\n",
- (int)(jiffies & 0xffff),
- (int)(rnp->boost_time & 0xffff));
- seq_printf(m, " balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
- rnp->n_balk_blkd_tasks,
- rnp->n_balk_exp_gp_tasks,
- rnp->n_balk_boost_tasks,
- rnp->n_balk_notblocked,
- rnp->n_balk_notyet,
- rnp->n_balk_nos);
-}
-
-static int show_rcu_node_boost(struct seq_file *m, void *unused)
-{
- struct rcu_node *rnp;
-
- rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
- print_one_rcu_node_boost(m, rnp);
- return 0;
-}
-
-static int rcu_node_boost_open(struct inode *inode, struct file *file)
-{
- return single_open(file, show_rcu_node_boost, NULL);
-}
-
-static const struct file_operations rcu_node_boost_fops = {
- .owner = THIS_MODULE,
- .open = rcu_node_boost_open,
- .read = seq_read,
- .llseek = no_llseek,
- .release = single_release,
-};
-
-#endif /* #ifdef CONFIG_RCU_BOOST */
-
-static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
-{
- unsigned long gpnum;
- int level = 0;
- struct rcu_node *rnp;
-
- gpnum = rsp->gpnum;
- seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x ",
- ulong2long(rsp->completed), ulong2long(gpnum),
- rsp->fqs_state,
- (long)(rsp->jiffies_force_qs - jiffies),
- (int)(jiffies & 0xffff));
- seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n",
- rsp->n_force_qs, rsp->n_force_qs_ngp,
- rsp->n_force_qs - rsp->n_force_qs_ngp,
- rsp->n_force_qs_lh, rsp->qlen_lazy, rsp->qlen);
- for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) {
- if (rnp->level != level) {
- seq_puts(m, "\n");
- level = rnp->level;
- }
- seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ",
- rnp->qsmask, rnp->qsmaskinit,
- ".G"[rnp->gp_tasks != NULL],
- ".E"[rnp->exp_tasks != NULL],
- ".T"[!list_empty(&rnp->blkd_tasks)],
- rnp->grplo, rnp->grphi, rnp->grpnum);
- }
- seq_puts(m, "\n");
-}
-
-static int show_rcuhier(struct seq_file *m, void *v)
-{
- struct rcu_state *rsp = (struct rcu_state *)m->private;
- print_one_rcu_state(m, rsp);
- return 0;
-}
-
-static int rcuhier_open(struct inode *inode, struct file *file)
-{
- return single_open(file, show_rcuhier, inode->i_private);
-}
-
-static const struct file_operations rcuhier_fops = {
- .owner = THIS_MODULE,
- .open = rcuhier_open,
- .read = seq_read,
- .llseek = no_llseek,
- .release = single_release,
-};
-
-static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp)
-{
- unsigned long flags;
- unsigned long completed;
- unsigned long gpnum;
- unsigned long gpage;
- unsigned long gpmax;
- struct rcu_node *rnp = &rsp->node[0];
-
- raw_spin_lock_irqsave(&rnp->lock, flags);
- completed = ACCESS_ONCE(rsp->completed);
- gpnum = ACCESS_ONCE(rsp->gpnum);
- if (completed == gpnum)
- gpage = 0;
- else
- gpage = jiffies - rsp->gp_start;
- gpmax = rsp->gp_max;
- raw_spin_unlock_irqrestore(&rnp->lock, flags);
- seq_printf(m, "completed=%ld gpnum=%ld age=%ld max=%ld\n",
- ulong2long(completed), ulong2long(gpnum), gpage, gpmax);
-}
-
-static int show_rcugp(struct seq_file *m, void *v)
-{
- struct rcu_state *rsp = (struct rcu_state *)m->private;
- show_one_rcugp(m, rsp);
- return 0;
-}
-
-static int rcugp_open(struct inode *inode, struct file *file)
-{
- return single_open(file, show_rcugp, inode->i_private);
-}
-
-static const struct file_operations rcugp_fops = {
- .owner = THIS_MODULE,
- .open = rcugp_open,
- .read = seq_read,
- .llseek = no_llseek,
- .release = single_release,
-};
-
-static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp)
-{
- if (!rdp->beenonline)
- return;
- seq_printf(m, "%3d%cnp=%ld ",
- rdp->cpu,
- cpu_is_offline(rdp->cpu) ? '!' : ' ',
- rdp->n_rcu_pending);
- seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ",
- rdp->n_rp_qs_pending,
- rdp->n_rp_report_qs,
- rdp->n_rp_cb_ready,
- rdp->n_rp_cpu_needs_gp);
- seq_printf(m, "gpc=%ld gps=%ld nn=%ld\n",
- rdp->n_rp_gp_completed,
- rdp->n_rp_gp_started,
- rdp->n_rp_need_nothing);
-}
-
-static int show_rcu_pending(struct seq_file *m, void *v)
-{
- print_one_rcu_pending(m, (struct rcu_data *)v);
- return 0;
-}
-
-static const struct seq_operations rcu_pending_op = {
- .start = r_start,
- .next = r_next,
- .stop = r_stop,
- .show = show_rcu_pending,
-};
-
-static int rcu_pending_open(struct inode *inode, struct file *file)
-{
- return r_open(inode, file, &rcu_pending_op);
-}
-
-static const struct file_operations rcu_pending_fops = {
- .owner = THIS_MODULE,
- .open = rcu_pending_open,
- .read = seq_read,
- .llseek = no_llseek,
- .release = seq_release,
-};
-
-static int show_rcutorture(struct seq_file *m, void *unused)
-{
- seq_printf(m, "rcutorture test sequence: %lu %s\n",
- rcutorture_testseq >> 1,
- (rcutorture_testseq & 0x1) ? "(test in progress)" : "");
- seq_printf(m, "rcutorture update version number: %lu\n",
- rcutorture_vernum);
- return 0;
-}
-
-static int rcutorture_open(struct inode *inode, struct file *file)
-{
- return single_open(file, show_rcutorture, NULL);
-}
-
-static const struct file_operations rcutorture_fops = {
- .owner = THIS_MODULE,
- .open = rcutorture_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-
-static struct dentry *rcudir;
-
-static int __init rcutree_trace_init(void)
-{
- struct rcu_state *rsp;
- struct dentry *retval;
- struct dentry *rspdir;
-
- rcudir = debugfs_create_dir("rcu", NULL);
- if (!rcudir)
- goto free_out;
-
- for_each_rcu_flavor(rsp) {
- rspdir = debugfs_create_dir(rsp->name, rcudir);
- if (!rspdir)
- goto free_out;
-
- retval = debugfs_create_file("rcudata", 0444,
- rspdir, rsp, &rcudata_fops);
- if (!retval)
- goto free_out;
-
- retval = debugfs_create_file("rcuexp", 0444,
- rspdir, rsp, &rcuexp_fops);
- if (!retval)
- goto free_out;
-
- retval = debugfs_create_file("rcu_pending", 0444,
- rspdir, rsp, &rcu_pending_fops);
- if (!retval)
- goto free_out;
-
- retval = debugfs_create_file("rcubarrier", 0444,
- rspdir, rsp, &rcubarrier_fops);
- if (!retval)
- goto free_out;
-
-#ifdef CONFIG_RCU_BOOST
- if (rsp == &rcu_preempt_state) {
- retval = debugfs_create_file("rcuboost", 0444,
- rspdir, NULL, &rcu_node_boost_fops);
- if (!retval)
- goto free_out;
- }
-#endif
-
- retval = debugfs_create_file("rcugp", 0444,
- rspdir, rsp, &rcugp_fops);
- if (!retval)
- goto free_out;
-
- retval = debugfs_create_file("rcuhier", 0444,
- rspdir, rsp, &rcuhier_fops);
- if (!retval)
- goto free_out;
- }
-
- retval = debugfs_create_file("rcutorture", 0444, rcudir,
- NULL, &rcutorture_fops);
- if (!retval)
- goto free_out;
- return 0;
-free_out:
- debugfs_remove_recursive(rcudir);
- return 1;
-}
-
-static void __exit rcutree_trace_cleanup(void)
-{
- debugfs_remove_recursive(rcudir);
-}
-
-
-module_init(rcutree_trace_init);
-module_exit(rcutree_trace_cleanup);
-
-MODULE_AUTHOR("Paul E. McKenney");
-MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
-MODULE_LICENSE("GPL");
projects / linux-2.6-block.git / blobdiff