Release 4.15 kernel/taskstats.c

/*
 * taskstats.c - Export per-task statistics to userland
 *
 * Copyright (C) Shailabh Nagar, IBM Corp. 2006
 *           (C) Balbir Singh,   IBM Corp. 2006
 *
 * 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.
 *
 */

#include <linux/kernel.h>
#include <linux/taskstats_kern.h>
#include <linux/tsacct_kern.h>
#include <linux/delayacct.h>
#include <linux/cpumask.h>
#include <linux/percpu.h>
#include <linux/slab.h>
#include <linux/cgroupstats.h>
#include <linux/cgroup.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/pid_namespace.h>
#include <net/genetlink.h>
#include <linux/atomic.h>
#include <linux/sched/cputime.h>

/*
 * Maximum length of a cpumask that can be specified in
 * the TASKSTATS_CMD_ATTR_REGISTER/DEREGISTER_CPUMASK attribute
 */

#define TASKSTATS_CPUMASK_MAXLEN	(100+6*NR_CPUS)

static DEFINE_PER_CPU(__u32, taskstats_seqnum);

static int family_registered;

struct kmem_cache *taskstats_cache;


static struct genl_family family;


static const struct nla_policy taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = {
	[TASKSTATS_CMD_ATTR_PID]  = { .type = NLA_U32 },
	[TASKSTATS_CMD_ATTR_TGID] = { .type = NLA_U32 },
	[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING },
	[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },};

/*
 * We have to use TASKSTATS_CMD_ATTR_MAX here, it is the maxattr in the family.
 * Make sure they are always aligned.
 */

static const struct nla_policy cgroupstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = {
	[CGROUPSTATS_CMD_ATTR_FD] = { .type = NLA_U32 },
};


struct listener {
	
struct list_head list;
	
pid_t pid;
	
char valid;
};


struct listener_list {
	
struct rw_semaphore sem;
	
struct list_head list;
};
static DEFINE_PER_CPU(struct listener_list, listener_array);


enum actions {
	
REGISTER,
	
DEREGISTER,
	
CPU_DONT_CARE
};



static int prepare_reply(struct genl_info *info, u8 cmd, struct sk_buff **skbp,
				size_t size)
{
	struct sk_buff *skb;
	void *reply;

	/*
         * If new attributes are added, please revisit this allocation
         */
	skb = genlmsg_new(size, GFP_KERNEL);
	if (!skb)
		return -ENOMEM;

	if (!info) {
		int seq = this_cpu_inc_return(taskstats_seqnum) - 1;

		reply = genlmsg_put(skb, 0, seq, &family, 0, cmd);
	} else
		reply = genlmsg_put_reply(skb, info, &family, 0, cmd);
	if (reply == NULL) {
		nlmsg_free(skb);
		return -EINVAL;
	}

	*skbp = skb;
	return 0;
}

Contributors
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CommitProp
Shailabh Nagar
117
91.41%
1
14.29%
Thomas Graf
7
5.47%
4
57.14%
Christoph Lameter
3
2.34%
1
14.29%
Balbir Singh
1
0.78%
1
14.29%
Total
128
100.00%
7
100.00%

/*
 * Send taskstats data in @skb to listener with nl_pid @pid
 */


static int send_reply(struct sk_buff *skb, struct genl_info *info)
{
	struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb));
	void *reply = genlmsg_data(genlhdr);

	genlmsg_end(skb, reply);

	return genlmsg_reply(skb, info);
}

Contributors
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Shailabh Nagar
44
83.02%
2
50.00%
Johannes Berg
6
11.32%
1
25.00%
Arnaldo Carvalho de Melo
3
5.66%
1
25.00%
Total
53
100.00%
4
100.00%

/*
 * Send taskstats data in @skb to listeners registered for @cpu's exit data
 */


static void send_cpu_listeners(struct sk_buff *skb,
					struct listener_list *listeners)
{
	struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb));
	struct listener *s, *tmp;
	struct sk_buff *skb_next, *skb_cur = skb;
	void *reply = genlmsg_data(genlhdr);
	int rc, delcount = 0;

	genlmsg_end(skb, reply);

	rc = 0;
	down_read(&listeners->sem);
	list_for_each_entry(s, &listeners->list, list) {
		skb_next = NULL;
		if (!list_is_last(&s->list, &listeners->list)) {
			skb_next = skb_clone(skb_cur, GFP_KERNEL);
			if (!skb_next)
				break;
		}
		rc = genlmsg_unicast(&init_net, skb_cur, s->pid);
		if (rc == -ECONNREFUSED) {
			s->valid = 0;
			delcount++;
		}
		skb_cur = skb_next;
	}
	up_read(&listeners->sem);

	if (skb_cur)
		nlmsg_free(skb_cur);

	if (!delcount)
		return;

	/* Delete invalidated entries */
	down_write(&listeners->sem);
	list_for_each_entry_safe(s, tmp, &listeners->list, list) {
		if (!s->valid) {
			list_del(&s->list);
			kfree(s);
		}
	}
	up_write(&listeners->sem);
}

Contributors
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Shailabh Nagar
229
95.82%
4
57.14%
Oleg Nesterov
4
1.67%
1
14.29%
Arnaldo Carvalho de Melo
3
1.26%
1
14.29%
Johannes Berg
3
1.26%
1
14.29%
Total
239
100.00%
7
100.00%



static void fill_stats(struct user_namespace *user_ns,
		       struct pid_namespace *pid_ns,
		       struct task_struct *tsk, struct taskstats *stats)
{
	memset(stats, 0, sizeof(*stats));
	/*
         * Each accounting subsystem adds calls to its functions to
         * fill in relevant parts of struct taskstsats as follows
         *
         *      per-task-foo(stats, tsk);
         */

	delayacct_add_tsk(stats, tsk);

	/* fill in basic acct fields */
	stats->version = TASKSTATS_VERSION;
	stats->nvcsw = tsk->nvcsw;
	stats->nivcsw = tsk->nivcsw;
	bacct_add_tsk(user_ns, pid_ns, stats, tsk);

	/* fill in extended acct fields */
	xacct_add_tsk(stats, tsk);
}

Contributors
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CommitProp
Shailabh Nagar
26
29.21%
3
30.00%
Jay Lan
16
17.98%
2
20.00%
Maxim Uvarov
16
17.98%
1
10.00%
Oleg Nesterov
14
15.73%
2
20.00%
Eric W. Biedermann
14
15.73%
1
10.00%
Michael Holzheu
3
3.37%
1
10.00%
Total
89
100.00%
10
100.00%



static int fill_stats_for_pid(pid_t pid, struct taskstats *stats)
{
	struct task_struct *tsk;

	rcu_read_lock();
	tsk = find_task_by_vpid(pid);
	if (tsk)
		get_task_struct(tsk);
	rcu_read_unlock();
	if (!tsk)
		return -ESRCH;
	fill_stats(current_user_ns(), task_active_pid_ns(current), tsk, stats);
	put_task_struct(tsk);
	return 0;
}

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Michael Holzheu
57
78.08%
1
33.33%
Shailabh Nagar
8
10.96%
1
33.33%
Eric W. Biedermann
8
10.96%
1
33.33%
Total
73
100.00%
3
100.00%



static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats)
{
	struct task_struct *tsk, *first;
	unsigned long flags;
	int rc = -ESRCH;
	u64 delta, utime, stime;
	u64 start_time;

	/*
         * Add additional stats from live tasks except zombie thread group
         * leaders who are already counted with the dead tasks
         */
	rcu_read_lock();
	first = find_task_by_vpid(tgid);

	if (!first || !lock_task_sighand(first, &flags))
		goto out;

	if (first->signal->stats)
		memcpy(stats, first->signal->stats, sizeof(*stats));
	else
		memset(stats, 0, sizeof(*stats));

	tsk = first;
	start_time = ktime_get_ns();
	do {
		if (tsk->exit_state)
			continue;
		/*
                 * Accounting subsystem can call its functions here to
                 * fill in relevant parts of struct taskstsats as follows
                 *
                 *      per-task-foo(stats, tsk);
                 */
		delayacct_add_tsk(stats, tsk);

		/* calculate task elapsed time in nsec */
		delta = start_time - tsk->start_time;
		/* Convert to micro seconds */
		do_div(delta, NSEC_PER_USEC);
		stats->ac_etime += delta;

		task_cputime(tsk, &utime, &stime);
		stats->ac_utime += div_u64(utime, NSEC_PER_USEC);
		stats->ac_stime += div_u64(stime, NSEC_PER_USEC);

		stats->nvcsw += tsk->nvcsw;
		stats->nivcsw += tsk->nivcsw;
	} while_each_thread(first, tsk);

	
Contributors
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Shailabh Nagar
88
41.51%
3
33.33%
Zhang Xiao
71
33.49%
1
11.11%
Oleg Nesterov
32
15.09%
2
22.22%
Maxim Uvarov
16
7.55%
1
11.11%
Michael Holzheu
4
1.89%
1
11.11%
Pavel Emelyanov
1
0.47%
1
11.11%
Total
212
100.00%
9
100.00%

unlock_task_sighand(first, &flags);
	rc = 0;
out:
	rcu_read_unlock();

	stats->version = TASKSTATS_VERSION;
	/*
         * Accounting subsystems can also add calls here to modify
         * fields of taskstats.
         */
	return rc;

}

static 
void fill_tgid_exit(struct task_struct *tsk)
{
	unsigned long flags;

	spin_lock_irqsave(&tsk->sighand->siglock, flags);
	if (!tsk->signal->stats)
		goto ret;

	/*
         * Each accounting subsystem calls its functions here to
         * accumalate its per-task stats for tsk, into the per-tgid structure
         *
         *      per-task-foo(tsk->signal->stats, tsk);
         */
	delayacct_add_tsk(tsk->signal->stats, tsk);
ret:
	spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
	return;
}

Contributors
Person
Tokens
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CommitProp
Shailabh Nagar
61
92.42%
2
50.00%
Oleg Nesterov
4
6.06%
1
25.00%
Michael Holzheu
1
1.52%
1
25.00%
Total
66
100.00%
4
100.00%



static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd)
{
	struct listener_list *listeners;
	struct listener *s, *tmp, *s2;
	unsigned int cpu;
	int ret = 0;

	if (!cpumask_subset(mask, cpu_possible_mask))
		return -EINVAL;

	if (current_user_ns() != &init_user_ns)
		return -EINVAL;

	if (task_active_pid_ns(current) != &init_pid_ns)
		return -EINVAL;

	if (isadd == REGISTER) {
		for_each_cpu(cpu, mask) {
			s = kmalloc_node(sizeof(struct listener),
					GFP_KERNEL, cpu_to_node(cpu));
			if (!s) {
				ret = -ENOMEM;
				goto cleanup;
			}
			s->pid = pid;
			s->valid = 1;

			listeners = &per_cpu(listener_array, cpu);
			down_write(&listeners->sem);
			list_for_each_entry(s2, &listeners->list, list) {
				if (s2->pid == pid && s2->valid)
					goto exists;
			}
			list_add(&s->list, &listeners->list);
			s = NULL;
exists:
			up_write(&listeners->sem);
			kfree(s); /* nop if NULL */
		}
		return 0;
	}

	/* Deregister or cleanup */
cleanup:
	for_each_cpu(cpu, mask) {
		listeners = &per_cpu(listener_array, cpu);
		down_write(&listeners->sem);
		list_for_each_entry_safe(s, tmp, &listeners->list, list) {
			if (s->pid == pid) {
				list_del(&s->list);
				kfree(s);
				break;
			}
		}
		up_write(&listeners->sem);
	}
	return ret;
}

Contributors
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Tokens
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CommitProp
Shailabh Nagar
211
70.57%
2
25.00%
Vasiliy Kulikov
32
10.70%
1
12.50%
Eric W. Biedermann
26
8.70%
1
12.50%
Chen Gang S
13
4.35%
1
12.50%
Oleg Nesterov
9
3.01%
2
25.00%
Rusty Russell
8
2.68%
1
12.50%
Total
299
100.00%
8
100.00%



static int parse(struct nlattr *na, struct cpumask *mask)
{
	char *data;
	int len;
	int ret;

	if (na == NULL)
		return 1;
	len = nla_len(na);
	if (len > TASKSTATS_CPUMASK_MAXLEN)
		return -E2BIG;
	if (len < 1)
		return -EINVAL;
	data = kmalloc(len, GFP_KERNEL);
	if (!data)
		return -ENOMEM;
	nla_strlcpy(data, na, len);
	ret = cpulist_parse(data, mask);
	kfree(data);
	return ret;
}

Contributors
Person
Tokens
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CommitProp
Shailabh Nagar
104
98.11%
2
66.67%
Rusty Russell
2
1.89%
1
33.33%
Total
106
100.00%
3
100.00%



static struct taskstats *mk_reply(struct sk_buff *skb, int type, u32 pid)
{
	struct nlattr *na, *ret;
	int aggr;

	aggr = (type == TASKSTATS_TYPE_PID)
			? TASKSTATS_TYPE_AGGR_PID
			: TASKSTATS_TYPE_AGGR_TGID;

	na = nla_nest_start(skb, aggr);
	if (!na)
		goto err;

	if (nla_put(skb, type, sizeof(pid), &pid) < 0) {
		nla_nest_cancel(skb, na);
		goto err;
	}
	ret = nla_reserve_64bit(skb, TASKSTATS_TYPE_STATS,
				sizeof(struct taskstats), TASKSTATS_TYPE_NULL);
	if (!ret) {
		nla_nest_cancel(skb, na);
		goto err;
	}
	nla_nest_end(skb, na);

	return nla_data(ret);
err:
	return NULL;
}

Contributors
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CommitProp
Oleg Nesterov
115
80.99%
3
50.00%
Chen Gang S
18
12.68%
1
16.67%
Jeff Mahoney
6
4.23%
1
16.67%
Nicolas Dichtel
3
2.11%
1
16.67%
Total
142
100.00%
6
100.00%



static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
{
	int rc = 0;
	struct sk_buff *rep_skb;
	struct cgroupstats *stats;
	struct nlattr *na;
	size_t size;
	u32 fd;
	struct fd f;

	na = info->attrs[CGROUPSTATS_CMD_ATTR_FD];
	if (!na)
		return -EINVAL;

	fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]);
	f = fdget(fd);
	if (!f.file)
		return 0;

	size = nla_total_size(sizeof(struct cgroupstats));

	rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb,
				size);
	if (rc < 0)
		goto err;

	na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS,
				sizeof(struct cgroupstats));
	if (na == NULL) {
		nlmsg_free(rep_skb);
		rc = -EMSGSIZE;
		goto err;
	}

	stats = nla_data(na);
	memset(stats, 0, sizeof(*stats));

	rc = cgroupstats_build(stats, f.file->f_path.dentry);
	if (rc < 0) {
		nlmsg_free(rep_skb);
		goto err;
	}

	rc = send_reply(rep_skb, info);

err:
	fdput(f);
	return rc;
}

Contributors
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CommitProp
Balbir Singh
185
79.40%
1
16.67%
Alan Cox
16
6.87%
1
16.67%
Adrian Bunk
14
6.01%
1
16.67%
Al Viro
13
5.58%
2
33.33%
Jesper Juhl
5
2.15%
1
16.67%
Total
233
100.00%
6
100.00%



static int cmd_attr_register_cpumask(struct genl_info *info)
{
	cpumask_var_t mask;
	int rc;

	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
		return -ENOMEM;
	rc = parse(info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK], mask);
	if (rc < 0)
		goto out;
	rc = add_del_listener(info->snd_portid, mask, REGISTER);
out:
	free_cpumask_var(mask);
	return rc;
}

Contributors
Person
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CommitProp
Shailabh Nagar
40
51.28%
3
50.00%
Rusty Russell
22
28.21%
1
16.67%
Michael Holzheu
15
19.23%
1
16.67%
Eric W. Biedermann
1
1.28%
1
16.67%
Total
78
100.00%
6
100.00%



static int cmd_attr_deregister_cpumask(struct genl_info *info)
{
	cpumask_var_t mask;
	int rc;

	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
		return -ENOMEM;
	rc = parse(info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK], mask);
	if (rc < 0)
		goto out;
	rc = add_del_listener(info->snd_portid, mask, DEREGISTER);
out:
	free_cpumask_var(mask);
	return rc;
}

Contributors
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CommitProp
Michael Holzheu
33
42.31%
1
25.00%
Shailabh Nagar
30
38.46%
1
25.00%
Rusty Russell
14
17.95%
1
25.00%
Eric W. Biedermann
1
1.28%
1
25.00%
Total
78
100.00%
4
100.00%



static size_t taskstats_packet_size(void)
{
	size_t size;

	size = nla_total_size(sizeof(u32)) +
		nla_total_size_64bit(sizeof(struct taskstats)) +
		nla_total_size(0);

	return size;
}

Contributors
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Jeff Mahoney
37
97.37%
1
50.00%
Nicolas Dichtel
1
2.63%
1
50.00%
Total
38
100.00%
2
100.00%



static int cmd_attr_pid(struct genl_info *info)
{
	struct taskstats *stats;
	struct sk_buff *rep_skb;
	size_t size;
	u32 pid;
	int rc;

	size = taskstats_packet_size();

	rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size);
	if (rc < 0)
		return rc;

	rc = -EINVAL;
	pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]);
	stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID, pid);
	if (!stats)
		goto err;

	rc = fill_stats_for_pid(pid, stats);
	if (rc < 0)
		goto err;
	return send_reply(rep_skb, info);
err:
	nlmsg_free(rep_skb);
	return rc;
}

Contributors
Person
Tokens
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CommitProp
Shailabh Nagar
53
40.77%
1
14.29%
Michael Holzheu
50
38.46%
2
28.57%
Oleg Nesterov
25
19.23%
3
42.86%
Jeff Mahoney
2
1.54%
1
14.29%
Total
130
100.00%
7
100.00%



static int cmd_attr_tgid(struct genl_info *info)
{
	struct taskstats *stats;
	struct sk_buff *rep_skb;
	size_t size;
	u32 tgid;
	int rc;

	size = taskstats_packet_size();

	rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size);
	if (rc < 0)
		return rc;

	rc = -EINVAL;
	tgid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_TGID]);
	stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID, tgid);
	if (!stats)
		goto err;

	rc = fill_stats_for_tgid(tgid, stats);
	if (rc < 0)
		goto err;
	return send_reply(rep_skb, info);
err:
	nlmsg_free(rep_skb);
	return rc;
}

Contributors
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CommitProp
Michael Holzheu
60
46.15%
2
28.57%
Shailabh Nagar
48
36.92%
1
14.29%
Oleg Nesterov
20
15.38%
3
42.86%
Jeff Mahoney
2
1.54%
1
14.29%
Total
130
100.00%
7
100.00%



static int taskstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
{
	if (info->attrs[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK])
		return cmd_attr_register_cpumask(info);
	else if (info->attrs[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK])
		return cmd_attr_deregister_cpumask(info);
	else if (info->attrs[TASKSTATS_CMD_ATTR_PID])
		return cmd_attr_pid(info);
	else if (info->attrs[TASKSTATS_CMD_ATTR_TGID])
		return cmd_attr_tgid(info);
	else
		return -EINVAL;
}

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Michael Holzheu
84
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1
100.00%
Total
84
100.00%
1
100.00%



static struct taskstats *taskstats_tgid_alloc(struct task_struct *tsk)
{
	struct signal_struct *sig = tsk->signal;
	struct taskstats *stats;

	if (sig->stats || thread_group_empty(tsk))
		goto ret;

	/* No problem if kmem_cache_zalloc() fails */
	stats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL);

	spin_lock_irq(&tsk->sighand->siglock);
	if (!sig->stats) {
		sig->stats = stats;
		stats = NULL;
	}
	spin_unlock_irq(&tsk->sighand->siglock);

	if (stats)
		kmem_cache_free(taskstats_cache, stats);
ret:
	return sig->stats;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Oleg Nesterov
108
100.00%
1
100.00%
Total
108
100.00%
1
100.00%

/* Send pid data out on exit */


void taskstats_exit(struct task_struct *tsk, int group_dead)
{
	int rc;
	struct listener_list *listeners;
	struct taskstats *stats;
	struct sk_buff *rep_skb;
	size_t size;
	int is_thread_group;

	if (!family_registered)
		return;

	/*
         * Size includes space for nested attributes
         */
	size = taskstats_packet_size();

	is_thread_group = !!taskstats_tgid_alloc(tsk);
	if (is_thread_group) {
		/* PID + STATS + TGID + STATS */
		size = 2 * size;
		/* fill the tsk->signal->stats structure */
		fill_tgid_exit(tsk);
	}

	listeners = raw_cpu_ptr(&listener_array);
	if (list_empty(&listeners->list))
		return;

	rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, size);
	if (rc < 0)
		return;

	stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID,
			 task_pid_nr_ns(tsk, &init_pid_ns));
	if (!stats)
		goto err;

	fill_stats(&init_user_ns, &init_pid_ns, tsk, stats);

	/*
         * Doesn't matter if tsk is the leader or the last group member leaving
         */
	if (!is_thread_group || !group_dead)
		goto send;

	stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID,
			 task_tgid_nr_ns(tsk, &init_pid_ns));
	if (!stats)
		goto err;

	memcpy(stats, tsk->signal->stats, sizeof(*stats));

send:
	send_cpu_listeners(rep_skb, listeners);
	return;
err:
	nlmsg_free(rep_skb);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Shailabh Nagar
107
47.35%
3
20.00%
Oleg Nesterov
96
42.48%
7
46.67%
Eric W. Biedermann
18
7.96%
1
6.67%
Jeff Mahoney
2
0.88%
1
6.67%
Christoph Lameter
2
0.88%
2
13.33%
Michael Holzheu
1
0.44%
1
6.67%
Total
226
100.00%
15
100.00%


static const struct genl_ops taskstats_ops[] = {
	{
		.cmd		= TASKSTATS_CMD_GET,
		.doit		= taskstats_user_cmd,
		.policy		= taskstats_cmd_get_policy,
		.flags		= GENL_ADMIN_PERM,
        },
	{
		.cmd		= CGROUPSTATS_CMD_GET,
		.doit		= cgroupstats_user_cmd,
		.policy		= cgroupstats_cmd_get_policy,
        },
};


static struct genl_family family __ro_after_init = {
	.name		= TASKSTATS_GENL_NAME,
	.version	= TASKSTATS_GENL_VERSION,
	.maxattr	= TASKSTATS_CMD_ATTR_MAX,
	.module		= THIS_MODULE,
	.ops		= taskstats_ops,
	.n_ops		= ARRAY_SIZE(taskstats_ops),
};

/* Needed early in initialization */


void __init taskstats_init_early(void)
{
	unsigned int i;

	taskstats_cache = KMEM_CACHE(taskstats, SLAB_PANIC);
	for_each_possible_cpu(i) {
		INIT_LIST_HEAD(&(per_cpu(listener_array, i).list));
		init_rwsem(&(per_cpu(listener_array, i).sem));
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Shailabh Nagar
56
98.25%
2
66.67%
Christoph Lameter
1
1.75%
1
33.33%
Total
57
100.00%
3
100.00%



static int __init taskstats_init(void)
{
	int rc;

	rc = genl_register_family(&family);
	if (rc)
		return rc;

	family_registered = 1;
	pr_info("registered taskstats version %d\n", TASKSTATS_GENL_VERSION);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Shailabh Nagar
24
58.54%
1
20.00%
Balbir Singh
12
29.27%
1
20.00%
Johannes Berg
4
9.76%
2
40.00%
Mandeep Singh Baines
1
2.44%
1
20.00%
Total
41
100.00%
5
100.00%

/*
 * late initcall ensures initialization of statistics collection
 * mechanisms precedes initialization of the taskstats interface
 */

late_initcall(taskstats_init);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Shailabh Nagar
1437
48.91%
7
11.67%
Oleg Nesterov
441
15.01%
10
16.67%
Michael Holzheu
308
10.48%
2
3.33%
Balbir Singh
249
8.48%
2
3.33%
Zhang Xiao
74
2.52%
1
1.67%
Eric W. Biedermann
71
2.42%
2
3.33%
Johannes Berg
60
2.04%
5
8.33%
Jeff Mahoney
49
1.67%
1
1.67%
Rusty Russell
46
1.57%
1
1.67%
Vasiliy Kulikov
32
1.09%
1
1.67%
Maxim Uvarov
32
1.09%
1
1.67%
Chen Gang S
31
1.06%
2
3.33%
Jay Lan
19
0.65%
2
3.33%
Alan Cox
16
0.54%
1
1.67%
Adrian Bunk
14
0.48%
1
1.67%
Al Viro
13
0.44%
2
3.33%
Christoph Lameter
8
0.27%
4
6.67%
Thomas Graf
7
0.24%
4
6.67%
Arnaldo Carvalho de Melo
6
0.20%
1
1.67%
Linus Torvalds
5
0.17%
1
1.67%
Jesper Juhl
5
0.17%
1
1.67%
Nicolas Dichtel
4
0.14%
1
1.67%
Tejun Heo
3
0.10%
1
1.67%
Alexey Dobriyan
2
0.07%
1
1.67%
Américo Wang
2
0.07%
1
1.67%
Mandeep Singh Baines
1
0.03%
1
1.67%
Arun Sharma
1
0.03%
1
1.67%
Pavel Emelyanov
1
0.03%
1
1.67%
Robert P. J. Day
1
0.03%
1
1.67%
Total
2938
100.00%
60
100.00%
Directory: kernel

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