497 lines
13 KiB
C
497 lines
13 KiB
C
/*
|
|
* 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"
|
|
|
|
#define ulong2long(a) (*(long *)(&(a)))
|
|
|
|
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 = seq_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)
|
|
{
|
|
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);
|
|
seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c",
|
|
rdp->qlen_lazy, rdp->qlen,
|
|
".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 co=%lu ca=%lu\n",
|
|
rdp->n_cbs_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 = seq_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 = seq_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 = seq_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");
|