taskstats.c 15.4 KB
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/*
 * 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>
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#include <linux/tsacct_kern.h>
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#include <linux/delayacct.h>
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#include <linux/cpumask.h>
#include <linux/percpu.h>
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#include <linux/slab.h>
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#include <linux/cgroupstats.h>
#include <linux/cgroup.h>
#include <linux/fs.h>
#include <linux/file.h>
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#include <linux/pid_namespace.h>
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#include <net/genetlink.h>
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#include <linux/atomic.h>
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#include <linux/sched/cputime.h>
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/*
 * 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)

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static DEFINE_PER_CPU(__u32, taskstats_seqnum);
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static int family_registered;
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struct kmem_cache *taskstats_cache;
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static struct genl_family family;
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static const struct nla_policy taskstats_cmd_get_policy[TASKSTATS_CMD_ATTR_MAX+1] = {
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	[TASKSTATS_CMD_ATTR_PID]  = { .type = NLA_U32 },
	[TASKSTATS_CMD_ATTR_TGID] = { .type = NLA_U32 },
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	[TASKSTATS_CMD_ATTR_REGISTER_CPUMASK] = { .type = NLA_STRING },
	[TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK] = { .type = NLA_STRING },};

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/*
 * 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] = {
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	[CGROUPSTATS_CMD_ATTR_FD] = { .type = NLA_U32 },
};

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

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

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

	if (!info) {
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		int seq = this_cpu_inc_return(taskstats_seqnum) - 1;
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		reply = genlmsg_put(skb, 0, seq, &family, 0, cmd);
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	} else
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		reply = genlmsg_put_reply(skb, info, &family, 0, cmd);
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	if (reply == NULL) {
		nlmsg_free(skb);
		return -EINVAL;
	}

	*skbp = skb;
	return 0;
}

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/*
 * Send taskstats data in @skb to listener with nl_pid @pid
 */
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static int send_reply(struct sk_buff *skb, struct genl_info *info)
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{
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	struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb));
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	void *reply = genlmsg_data(genlhdr);
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	genlmsg_end(skb, reply);
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	return genlmsg_reply(skb, info);
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}

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/*
 * Send taskstats data in @skb to listeners registered for @cpu's exit data
 */
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static void send_cpu_listeners(struct sk_buff *skb,
					struct listener_list *listeners)
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{
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	struct genlmsghdr *genlhdr = nlmsg_data(nlmsg_hdr(skb));
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	struct listener *s, *tmp;
	struct sk_buff *skb_next, *skb_cur = skb;
	void *reply = genlmsg_data(genlhdr);
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	int rc, delcount = 0;
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	genlmsg_end(skb, reply);
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	rc = 0;
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	down_read(&listeners->sem);
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	list_for_each_entry(s, &listeners->list, list) {
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		skb_next = NULL;
		if (!list_is_last(&s->list, &listeners->list)) {
			skb_next = skb_clone(skb_cur, GFP_KERNEL);
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			if (!skb_next)
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				break;
		}
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		rc = genlmsg_unicast(&init_net, skb_cur, s->pid);
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		if (rc == -ECONNREFUSED) {
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			s->valid = 0;
			delcount++;
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		}
		skb_cur = skb_next;
	}
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	up_read(&listeners->sem);
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	if (skb_cur)
		nlmsg_free(skb_cur);

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	if (!delcount)
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		return;
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	/* 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);
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}

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

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	delayacct_add_tsk(stats, tsk);
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	/* fill in basic acct fields */
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	stats->version = TASKSTATS_VERSION;
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	stats->nvcsw = tsk->nvcsw;
	stats->nivcsw = tsk->nivcsw;
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	bacct_add_tsk(user_ns, pid_ns, stats, tsk);
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	/* fill in extended acct fields */
	xacct_add_tsk(stats, tsk);
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}
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static int fill_stats_for_pid(pid_t pid, struct taskstats *stats)
{
	struct task_struct *tsk;
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	rcu_read_lock();
	tsk = find_task_by_vpid(pid);
	if (tsk)
		get_task_struct(tsk);
	rcu_read_unlock();
	if (!tsk)
		return -ESRCH;
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	fill_stats(current_user_ns(), task_active_pid_ns(current), tsk, stats);
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	put_task_struct(tsk);
	return 0;
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}

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static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats)
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{
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	struct task_struct *tsk, *first;
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	unsigned long flags;
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	int rc = -ESRCH;
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	u64 delta, utime, stime;
	u64 start_time;
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	/*
	 * Add additional stats from live tasks except zombie thread group
	 * leaders who are already counted with the dead tasks
	 */
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	rcu_read_lock();
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	first = find_task_by_vpid(tgid);
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	if (!first || !lock_task_sighand(first, &flags))
		goto out;
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	if (first->signal->stats)
		memcpy(stats, first->signal->stats, sizeof(*stats));
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	else
		memset(stats, 0, sizeof(*stats));
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	tsk = first;
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	start_time = ktime_get_ns();
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	do {
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		if (tsk->exit_state)
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			continue;
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		/*
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		 * Accounting subsystem can call its functions here to
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		 * fill in relevant parts of struct taskstsats as follows
		 *
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		 *	per-task-foo(stats, tsk);
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		 */
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		delayacct_add_tsk(stats, tsk);
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		/* 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);

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		stats->nvcsw += tsk->nvcsw;
		stats->nivcsw += tsk->nivcsw;
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	} while_each_thread(first, tsk);
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	unlock_task_sighand(first, &flags);
	rc = 0;
out:
	rcu_read_unlock();

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

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

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	spin_lock_irqsave(&tsk->sighand->siglock, flags);
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	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:
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	spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
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	return;
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}

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static int add_del_listener(pid_t pid, const struct cpumask *mask, int isadd)
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{
	struct listener_list *listeners;
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	struct listener *s, *tmp, *s2;
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	unsigned int cpu;
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	int ret = 0;
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	if (!cpumask_subset(mask, cpu_possible_mask))
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		return -EINVAL;

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

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

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	if (isadd == REGISTER) {
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		for_each_cpu(cpu, mask) {
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			s = kmalloc_node(sizeof(struct listener),
					GFP_KERNEL, cpu_to_node(cpu));
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			if (!s) {
				ret = -ENOMEM;
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				goto cleanup;
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			}
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			s->pid = pid;
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			s->valid = 1;
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			listeners = &per_cpu(listener_array, cpu);
			down_write(&listeners->sem);
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			list_for_each_entry(s2, &listeners->list, list) {
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				if (s2->pid == pid && s2->valid)
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					goto exists;
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			}
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			list_add(&s->list, &listeners->list);
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			s = NULL;
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exists:
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			up_write(&listeners->sem);
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			kfree(s); /* nop if NULL */
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		}
		return 0;
	}

	/* Deregister or cleanup */
cleanup:
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	for_each_cpu(cpu, mask) {
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		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);
	}
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	return ret;
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}

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static int parse(struct nlattr *na, struct cpumask *mask)
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{
	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);
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	ret = cpulist_parse(data, mask);
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	kfree(data);
	return ret;
}

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

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

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

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

	fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]);
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	f = fdget(fd);
	if (!f.file)
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		return 0;
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	size = nla_total_size(sizeof(struct cgroupstats));
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	rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb,
				size);
	if (rc < 0)
		goto err;
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	na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS,
				sizeof(struct cgroupstats));
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	if (na == NULL) {
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		nlmsg_free(rep_skb);
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		rc = -EMSGSIZE;
		goto err;
	}

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

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	rc = send_reply(rep_skb, info);
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err:
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	fdput(f);
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	return rc;
}

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

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

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static size_t taskstats_packet_size(void)
{
	size_t size;

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

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	return size;
}

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static int cmd_attr_pid(struct genl_info *info)
{
	struct taskstats *stats;
	struct sk_buff *rep_skb;
	size_t size;
	u32 pid;
	int rc;
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	size = taskstats_packet_size();
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	rc = prepare_reply(info, TASKSTATS_CMD_NEW, &rep_skb, size);
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	if (rc < 0)
		return rc;

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

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

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

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	size = taskstats_packet_size();
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	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;

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

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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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;
}

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/* Send pid data out on exit */
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void taskstats_exit(struct task_struct *tsk, int group_dead)
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{
	int rc;
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	struct listener_list *listeners;
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	struct taskstats *stats;
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	struct sk_buff *rep_skb;
	size_t size;
	int is_thread_group;

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	if (!family_registered)
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		return;

	/*
	 * Size includes space for nested attributes
	 */
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	size = taskstats_packet_size();
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	is_thread_group = !!taskstats_tgid_alloc(tsk);
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	if (is_thread_group) {
		/* PID + STATS + TGID + STATS */
		size = 2 * size;
		/* fill the tsk->signal->stats structure */
		fill_tgid_exit(tsk);
	}

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

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	rc = prepare_reply(NULL, TASKSTATS_CMD_NEW, &rep_skb, size);
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	if (rc < 0)
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		return;
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	stats = mk_reply(rep_skb, TASKSTATS_TYPE_PID,
			 task_pid_nr_ns(tsk, &init_pid_ns));
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	if (!stats)
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		goto err;
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	fill_stats(&init_user_ns, &init_pid_ns, tsk, stats);
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	/*
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	 * Doesn't matter if tsk is the leader or the last group member leaving
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	 */
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	if (!is_thread_group || !group_dead)
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		goto send;
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	stats = mk_reply(rep_skb, TASKSTATS_TYPE_TGID,
			 task_tgid_nr_ns(tsk, &init_pid_ns));
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	if (!stats)
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		goto err;
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	memcpy(stats, tsk->signal->stats, sizeof(*stats));
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send:
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	send_cpu_listeners(rep_skb, listeners);
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	return;
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err:
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	nlmsg_free(rep_skb);
}

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static const struct genl_ops taskstats_ops[] = {
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	{
		.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,
	},
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};

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static struct genl_family family __ro_after_init = {
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	.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),
};

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/* Needed early in initialization */
void __init taskstats_init_early(void)
{
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	unsigned int i;

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

static int __init taskstats_init(void)
{
	int rc;

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

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

/*
 * late initcall ensures initialization of statistics collection
 * mechanisms precedes initialization of the taskstats interface
 */
late_initcall(taskstats_init);