SmartisanOS_Kernel_Source/kernel/rcutree_trace.c at master · ActiveProgram/SmartisanOS_Kernel_Source · GitHub

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* 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"

#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=%lu g=%lu pq=%d pgp=%lu qp=%d",

rdp->cpu,

cpu_is_offline(rdp->cpu) ? '!' : ' ',

rdp->completed, rdp->gpnum,

rdp->passed_quiesce, rdp->passed_quiesce_gpnum,

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/%d 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_cpu, 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);

}

#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_quiesce, rdp->passed_quiesce_gpnum,

rdp->qs_pending);

seq_printf(m, ",%d,%llx,%d,%lu",

atomic_read(&rdp->dynticks->dynticks),

rdp->dynticks->dynticks_nesting,

rdp->dynticks->dynticks_nmi_nesting,

rdp->dynticks_fqs);

seq_printf(m, ",%lu", rdp->offline_fqs);

seq_printf(m, ",%ld,%ld,\"%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, ",%d,\"%c\"",

per_cpu(rcu_cpu_has_work, rdp->cpu),

convert_kthread_status(per_cpu(rcu_cpu_kthread_status,

rdp->cpu)));

#endif /* #ifdef CONFIG_RCU_BOOST */

seq_printf(m, ",%ld", 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\",\"pgp\",\"pq\",");

seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\",");

seq_puts(m, "\"of\",\"qll\",\"ql\",\"qs\"");

#ifdef CONFIG_RCU_BOOST

seq_puts(m, "\"kt\",\"ktl\"");

#endif /* #ifdef CONFIG_RCU_BOOST */

seq_puts(m, ",\"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,

};

#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 "

"j=%04x bt=%04x\n",

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,

(int)(jiffies & 0xffff),

(int)(rnp->boost_time & 0xffff));

seq_printf(m, "%s: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",

" balk",

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 = seq_lseek,

.release = single_release,

};

* Create the rcuboost debugfs entry. Standard error return.

static int rcu_boost_trace_create_file(struct dentry *rcudir)

{

return !debugfs_create_file("rcuboost", 0444, rcudir, NULL,

&rcu_node_boost_fops);

}

#else /* #ifdef CONFIG_RCU_BOOST */

static int rcu_boost_trace_create_file(struct dentry *rcudir)

{

return 0; /* There cannot be an error if we didn't create it! */

}

#endif /* #else #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=%lu g=%lu s=%d jfq=%ld j=%x "

"nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",

rsp->completed, gpnum, rsp->fqs_state,

(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;

}

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 *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 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 = rsp->completed;

gpnum = rsp->gpnum;

if (rsp->completed == rsp->gpnum)

gpage = 0;

else

gpage = jiffies - rsp->gp_start;

gpmax = rsp->gp_max;

raw_spin_unlock_irqrestore(&rnp->lock, flags);

seq_printf(m, "%s: completed=%ld gpnum=%lu age=%ld max=%ld\n",

rsp->name, completed, gpnum, gpage, gpmax);

}

static int show_rcugp(struct seq_file *m, void *unused)

{

#ifdef CONFIG_TREE_PREEMPT_RCU

show_one_rcugp(m, &rcu_preempt_state);

#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */

show_one_rcugp(m, &rcu_sched_state);

show_one_rcugp(m, &rcu_bh_state);

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 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 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;

if (rcu_boost_trace_create_file(rcudir))

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;

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");

SmartisanOS_Kernel_Source/kernel/rcutree_trace.c at master · ActiveProgram/SmartisanOS_Kernel_Source · GitHub

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