/* * 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");