/* * 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 "tree.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");
/*
* 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 "tree.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");