mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
29494be71a
When we handle the CPU_DYING notifier, the whole system is stopped except for the current CPU. We therefore need no synchronization with the other CPUs. This allows us to move any orphaned RCU callbacks directly to the list of any online CPU without needing to run them through the global orphan lists. These global orphan lists can therefore be dispensed with. This commit makes thes changes, though currently victimizes CPU 0 @@@. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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");
|