352 lines
9.7 KiB
C
352 lines
9.7 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 <asm/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 void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
|
|
{
|
|
if (!rdp->beenonline)
|
|
return;
|
|
seq_printf(m, "%3d%cc=%lu g=%lu pq=%d pqc=%lu qp=%d",
|
|
rdp->cpu,
|
|
cpu_is_offline(rdp->cpu) ? '!' : ' ',
|
|
rdp->completed, rdp->gpnum,
|
|
rdp->passed_quiesc, rdp->passed_quiesc_completed,
|
|
rdp->qs_pending);
|
|
#ifdef CONFIG_NO_HZ
|
|
seq_printf(m, " dt=%d/%d dn=%d df=%lu",
|
|
rdp->dynticks->dynticks,
|
|
rdp->dynticks->dynticks_nesting,
|
|
rdp->dynticks->dynticks_nmi,
|
|
rdp->dynticks_fqs);
|
|
#endif /* #ifdef CONFIG_NO_HZ */
|
|
seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi);
|
|
seq_printf(m, " ql=%ld b=%ld", rdp->qlen, rdp->blimit);
|
|
seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
|
|
rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
|
|
}
|
|
|
|
#define PRINT_RCU_DATA(name, func, m) \
|
|
do { \
|
|
int _p_r_d_i; \
|
|
\
|
|
for_each_possible_cpu(_p_r_d_i) \
|
|
func(m, &per_cpu(name, _p_r_d_i)); \
|
|
} while (0)
|
|
|
|
static int show_rcudata(struct seq_file *m, void *unused)
|
|
{
|
|
#ifdef CONFIG_TREE_PREEMPT_RCU
|
|
seq_puts(m, "rcu_preempt:\n");
|
|
PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data, m);
|
|
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
|
|
seq_puts(m, "rcu_sched:\n");
|
|
PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data, m);
|
|
seq_puts(m, "rcu_bh:\n");
|
|
PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
|
|
return 0;
|
|
}
|
|
|
|
static int rcudata_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, show_rcudata, NULL);
|
|
}
|
|
|
|
static const struct file_operations rcudata_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rcudata_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
|
|
{
|
|
if (!rdp->beenonline)
|
|
return;
|
|
seq_printf(m, "%d,%s,%lu,%lu,%d,%lu,%d",
|
|
rdp->cpu,
|
|
cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
|
|
rdp->completed, rdp->gpnum,
|
|
rdp->passed_quiesc, rdp->passed_quiesc_completed,
|
|
rdp->qs_pending);
|
|
#ifdef CONFIG_NO_HZ
|
|
seq_printf(m, ",%d,%d,%d,%lu",
|
|
rdp->dynticks->dynticks,
|
|
rdp->dynticks->dynticks_nesting,
|
|
rdp->dynticks->dynticks_nmi,
|
|
rdp->dynticks_fqs);
|
|
#endif /* #ifdef CONFIG_NO_HZ */
|
|
seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
|
|
seq_printf(m, ",%ld,%ld", rdp->qlen, rdp->blimit);
|
|
seq_printf(m, ",%lu,%lu,%lu\n",
|
|
rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
|
|
}
|
|
|
|
static int show_rcudata_csv(struct seq_file *m, void *unused)
|
|
{
|
|
seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\",");
|
|
#ifdef CONFIG_NO_HZ
|
|
seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\",");
|
|
#endif /* #ifdef CONFIG_NO_HZ */
|
|
seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\",\"ci\",\"co\",\"ca\"\n");
|
|
#ifdef CONFIG_TREE_PREEMPT_RCU
|
|
seq_puts(m, "\"rcu_preempt:\"\n");
|
|
PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data_csv, m);
|
|
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
|
|
seq_puts(m, "\"rcu_sched:\"\n");
|
|
PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data_csv, m);
|
|
seq_puts(m, "\"rcu_bh:\"\n");
|
|
PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
|
|
return 0;
|
|
}
|
|
|
|
static int rcudata_csv_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, show_rcudata_csv, NULL);
|
|
}
|
|
|
|
static const struct file_operations rcudata_csv_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rcudata_csv_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
|
|
{
|
|
unsigned long gpnum;
|
|
int level = 0;
|
|
int phase;
|
|
struct rcu_node *rnp;
|
|
|
|
gpnum = rsp->gpnum;
|
|
seq_printf(m, "c=%lu g=%lu s=%d jfq=%ld j=%x "
|
|
"nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",
|
|
rsp->completed, gpnum, rsp->signaled,
|
|
(long)(rsp->jiffies_force_qs - jiffies),
|
|
(int)(jiffies & 0xffff),
|
|
rsp->n_force_qs, rsp->n_force_qs_ngp,
|
|
rsp->n_force_qs - rsp->n_force_qs_ngp,
|
|
rsp->n_force_qs_lh);
|
|
for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) {
|
|
if (rnp->level != level) {
|
|
seq_puts(m, "\n");
|
|
level = rnp->level;
|
|
}
|
|
phase = gpnum & 0x1;
|
|
seq_printf(m, "%lx/%lx %c%c>%c%c %d:%d ^%d ",
|
|
rnp->qsmask, rnp->qsmaskinit,
|
|
"T."[list_empty(&rnp->blocked_tasks[phase])],
|
|
"E."[list_empty(&rnp->blocked_tasks[phase + 2])],
|
|
"T."[list_empty(&rnp->blocked_tasks[!phase])],
|
|
"E."[list_empty(&rnp->blocked_tasks[!phase + 2])],
|
|
rnp->grplo, rnp->grphi, rnp->grpnum);
|
|
}
|
|
seq_puts(m, "\n");
|
|
}
|
|
|
|
static int show_rcuhier(struct seq_file *m, void *unused)
|
|
{
|
|
#ifdef CONFIG_TREE_PREEMPT_RCU
|
|
seq_puts(m, "rcu_preempt:\n");
|
|
print_one_rcu_state(m, &rcu_preempt_state);
|
|
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
|
|
seq_puts(m, "rcu_sched:\n");
|
|
print_one_rcu_state(m, &rcu_sched_state);
|
|
seq_puts(m, "rcu_bh:\n");
|
|
print_one_rcu_state(m, &rcu_bh_state);
|
|
return 0;
|
|
}
|
|
|
|
static int rcuhier_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, show_rcuhier, NULL);
|
|
}
|
|
|
|
static const struct file_operations rcuhier_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rcuhier_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int show_rcugp(struct seq_file *m, void *unused)
|
|
{
|
|
#ifdef CONFIG_TREE_PREEMPT_RCU
|
|
seq_printf(m, "rcu_preempt: completed=%ld gpnum=%lu\n",
|
|
rcu_preempt_state.completed, rcu_preempt_state.gpnum);
|
|
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
|
|
seq_printf(m, "rcu_sched: completed=%ld gpnum=%lu\n",
|
|
rcu_sched_state.completed, rcu_sched_state.gpnum);
|
|
seq_printf(m, "rcu_bh: completed=%ld gpnum=%lu\n",
|
|
rcu_bh_state.completed, rcu_bh_state.gpnum);
|
|
return 0;
|
|
}
|
|
|
|
static int rcugp_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, show_rcugp, NULL);
|
|
}
|
|
|
|
static const struct file_operations rcugp_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rcugp_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp)
|
|
{
|
|
seq_printf(m, "%3d%cnp=%ld "
|
|
"qsp=%ld rpq=%ld cbr=%ld cng=%ld "
|
|
"gpc=%ld gps=%ld nf=%ld nn=%ld\n",
|
|
rdp->cpu,
|
|
cpu_is_offline(rdp->cpu) ? '!' : ' ',
|
|
rdp->n_rcu_pending,
|
|
rdp->n_rp_qs_pending,
|
|
rdp->n_rp_report_qs,
|
|
rdp->n_rp_cb_ready,
|
|
rdp->n_rp_cpu_needs_gp,
|
|
rdp->n_rp_gp_completed,
|
|
rdp->n_rp_gp_started,
|
|
rdp->n_rp_need_fqs,
|
|
rdp->n_rp_need_nothing);
|
|
}
|
|
|
|
static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp)
|
|
{
|
|
int cpu;
|
|
struct rcu_data *rdp;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
rdp = per_cpu_ptr(rsp->rda, cpu);
|
|
if (rdp->beenonline)
|
|
print_one_rcu_pending(m, rdp);
|
|
}
|
|
}
|
|
|
|
static int show_rcu_pending(struct seq_file *m, void *unused)
|
|
{
|
|
#ifdef CONFIG_TREE_PREEMPT_RCU
|
|
seq_puts(m, "rcu_preempt:\n");
|
|
print_rcu_pendings(m, &rcu_preempt_state);
|
|
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
|
|
seq_puts(m, "rcu_sched:\n");
|
|
print_rcu_pendings(m, &rcu_sched_state);
|
|
seq_puts(m, "rcu_bh:\n");
|
|
print_rcu_pendings(m, &rcu_bh_state);
|
|
return 0;
|
|
}
|
|
|
|
static int rcu_pending_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, show_rcu_pending, NULL);
|
|
}
|
|
|
|
static const struct file_operations rcu_pending_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rcu_pending_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static struct dentry *rcudir;
|
|
|
|
static int __init rcutree_trace_init(void)
|
|
{
|
|
struct dentry *retval;
|
|
|
|
rcudir = debugfs_create_dir("rcu", NULL);
|
|
if (!rcudir)
|
|
goto free_out;
|
|
|
|
retval = debugfs_create_file("rcudata", 0444, rcudir,
|
|
NULL, &rcudata_fops);
|
|
if (!retval)
|
|
goto free_out;
|
|
|
|
retval = debugfs_create_file("rcudata.csv", 0444, rcudir,
|
|
NULL, &rcudata_csv_fops);
|
|
if (!retval)
|
|
goto free_out;
|
|
|
|
retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
|
|
if (!retval)
|
|
goto free_out;
|
|
|
|
retval = debugfs_create_file("rcuhier", 0444, rcudir,
|
|
NULL, &rcuhier_fops);
|
|
if (!retval)
|
|
goto free_out;
|
|
|
|
retval = debugfs_create_file("rcu_pending", 0444, rcudir,
|
|
NULL, &rcu_pending_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");
|