[linux-2.6-block.git] / kernel / sched / cpuacct.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/cgroup.h>
#include <linux/slab.h>
#include <linux/percpu.h>
#include <linux/spinlock.h>
#include <linux/cpumask.h>
#include <linux/seq_file.h>
#include <linux/rcupdate.h>
#include <linux/kernel_stat.h>
#include <linux/err.h>

#include "sched.h"

/*
 * CPU accounting code for task groups.
 *
 * Based on the work by Paul Menage (menage@google.com) and Balbir Singh
 * (balbir@in.ibm.com).
 */

/* Time spent by the tasks of the cpu accounting group executing in ... */
enum cpuacct_stat_index {
	CPUACCT_STAT_USER,	/* ... user mode */
	CPUACCT_STAT_SYSTEM,	/* ... kernel mode */

	CPUACCT_STAT_NSTATS,
};

static const char * const cpuacct_stat_desc[] = {
	[CPUACCT_STAT_USER] = "user",
	[CPUACCT_STAT_SYSTEM] = "system",
};

struct cpuacct_usage {
	u64	usages[CPUACCT_STAT_NSTATS];
};

/* track cpu usage of a group of tasks and its child groups */
struct cpuacct {
	struct cgroup_subsys_state css;
	/* cpuusage holds pointer to a u64-type object on every cpu */
	struct cpuacct_usage __percpu *cpuusage;
	struct kernel_cpustat __percpu *cpustat;
};

static inline struct cpuacct *css_ca(struct cgroup_subsys_state *css)
{
	return css ? container_of(css, struct cpuacct, css) : NULL;
}

/* return cpu accounting group to which this task belongs */
static inline struct cpuacct *task_ca(struct task_struct *tsk)
{
	return css_ca(task_css(tsk, cpuacct_cgrp_id));
}

static inline struct cpuacct *parent_ca(struct cpuacct *ca)
{
	return css_ca(ca->css.parent);
}

static DEFINE_PER_CPU(struct cpuacct_usage, root_cpuacct_cpuusage);
static struct cpuacct root_cpuacct = {
	.cpustat	= &kernel_cpustat,
	.cpuusage	= &root_cpuacct_cpuusage,
};

/* create a new cpu accounting group */
static struct cgroup_subsys_state *
cpuacct_css_alloc(struct cgroup_subsys_state *parent_css)
{
	struct cpuacct *ca;

	if (!parent_css)
		return &root_cpuacct.css;

	ca = kzalloc(sizeof(*ca), GFP_KERNEL);
	if (!ca)
		goto out;

	ca->cpuusage = alloc_percpu(struct cpuacct_usage);
	if (!ca->cpuusage)
		goto out_free_ca;

	ca->cpustat = alloc_percpu(struct kernel_cpustat);
	if (!ca->cpustat)
		goto out_free_cpuusage;

	return &ca->css;

out_free_cpuusage:
	free_percpu(ca->cpuusage);
out_free_ca:
	kfree(ca);
out:
	return ERR_PTR(-ENOMEM);
}

/* destroy an existing cpu accounting group */
static void cpuacct_css_free(struct cgroup_subsys_state *css)
{
	struct cpuacct *ca = css_ca(css);

	free_percpu(ca->cpustat);
	free_percpu(ca->cpuusage);
	kfree(ca);
}

static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu,
				 enum cpuacct_stat_index index)
{
	struct cpuacct_usage *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
	u64 data;

	/*
	 * We allow index == CPUACCT_STAT_NSTATS here to read
	 * the sum of suages.
	 */
	BUG_ON(index > CPUACCT_STAT_NSTATS);

#ifndef CONFIG_64BIT
	/*
	 * Take rq->lock to make 64-bit read safe on 32-bit platforms.
	 */
	raw_spin_lock_irq(&cpu_rq(cpu)->lock);
#endif

	if (index == CPUACCT_STAT_NSTATS) {
		int i = 0;

		data = 0;
		for (i = 0; i < CPUACCT_STAT_NSTATS; i++)
			data += cpuusage->usages[i];
	} else {
		data = cpuusage->usages[index];
	}

#ifndef CONFIG_64BIT
	raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
#endif

	return data;
}

static void cpuacct_cpuusage_write(struct cpuacct *ca, int cpu, u64 val)
{
	struct cpuacct_usage *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
	int i;

#ifndef CONFIG_64BIT
	/*
	 * Take rq->lock to make 64-bit write safe on 32-bit platforms.
	 */
	raw_spin_lock_irq(&cpu_rq(cpu)->lock);
#endif

	for (i = 0; i < CPUACCT_STAT_NSTATS; i++)
		cpuusage->usages[i] = val;

#ifndef CONFIG_64BIT
	raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
#endif
}

/* return total cpu usage (in nanoseconds) of a group */
static u64 __cpuusage_read(struct cgroup_subsys_state *css,
			   enum cpuacct_stat_index index)
{
	struct cpuacct *ca = css_ca(css);
	u64 totalcpuusage = 0;
	int i;

	for_each_possible_cpu(i)
		totalcpuusage += cpuacct_cpuusage_read(ca, i, index);

	return totalcpuusage;
}

static u64 cpuusage_user_read(struct cgroup_subsys_state *css,
			      struct cftype *cft)
{
	return __cpuusage_read(css, CPUACCT_STAT_USER);
}

static u64 cpuusage_sys_read(struct cgroup_subsys_state *css,
			     struct cftype *cft)
{
	return __cpuusage_read(css, CPUACCT_STAT_SYSTEM);
}

static u64 cpuusage_read(struct cgroup_subsys_state *css, struct cftype *cft)
{
	return __cpuusage_read(css, CPUACCT_STAT_NSTATS);
}

static int cpuusage_write(struct cgroup_subsys_state *css, struct cftype *cft,
			  u64 val)
{
	struct cpuacct *ca = css_ca(css);
	int cpu;

	/*
	 * Only allow '0' here to do a reset.
	 */
	if (val)
		return -EINVAL;

	for_each_possible_cpu(cpu)
		cpuacct_cpuusage_write(ca, cpu, 0);

	return 0;
}

static int __cpuacct_percpu_seq_show(struct seq_file *m,
				     enum cpuacct_stat_index index)
{
	struct cpuacct *ca = css_ca(seq_css(m));
	u64 percpu;
	int i;

	for_each_possible_cpu(i) {
		percpu = cpuacct_cpuusage_read(ca, i, index);
		seq_printf(m, "%llu ", (unsigned long long) percpu);
	}
	seq_printf(m, "\n");
	return 0;
}

static int cpuacct_percpu_user_seq_show(struct seq_file *m, void *V)
{
	return __cpuacct_percpu_seq_show(m, CPUACCT_STAT_USER);
}

static int cpuacct_percpu_sys_seq_show(struct seq_file *m, void *V)
{
	return __cpuacct_percpu_seq_show(m, CPUACCT_STAT_SYSTEM);
}

static int cpuacct_percpu_seq_show(struct seq_file *m, void *V)
{
	return __cpuacct_percpu_seq_show(m, CPUACCT_STAT_NSTATS);
}

static int cpuacct_all_seq_show(struct seq_file *m, void *V)
{
	struct cpuacct *ca = css_ca(seq_css(m));
	int index;
	int cpu;

	seq_puts(m, "cpu");
	for (index = 0; index < CPUACCT_STAT_NSTATS; index++)
		seq_printf(m, " %s", cpuacct_stat_desc[index]);
	seq_puts(m, "\n");

	for_each_possible_cpu(cpu) {
		struct cpuacct_usage *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);

		seq_printf(m, "%d", cpu);

		for (index = 0; index < CPUACCT_STAT_NSTATS; index++) {
#ifndef CONFIG_64BIT
			/*
			 * Take rq->lock to make 64-bit read safe on 32-bit
			 * platforms.
			 */
			raw_spin_lock_irq(&cpu_rq(cpu)->lock);
#endif

			seq_printf(m, " %llu", cpuusage->usages[index]);

#ifndef CONFIG_64BIT
			raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
#endif
		}
		seq_puts(m, "\n");
	}
	return 0;
}

static int cpuacct_stats_show(struct seq_file *sf, void *v)
{
	struct cpuacct *ca = css_ca(seq_css(sf));
	s64 val[CPUACCT_STAT_NSTATS];
	int cpu;
	int stat;

	memset(val, 0, sizeof(val));
	for_each_possible_cpu(cpu) {
		u64 *cpustat = per_cpu_ptr(ca->cpustat, cpu)->cpustat;

		val[CPUACCT_STAT_USER]   += cpustat[CPUTIME_USER];
		val[CPUACCT_STAT_USER]   += cpustat[CPUTIME_NICE];
		val[CPUACCT_STAT_SYSTEM] += cpustat[CPUTIME_SYSTEM];
		val[CPUACCT_STAT_SYSTEM] += cpustat[CPUTIME_IRQ];
		val[CPUACCT_STAT_SYSTEM] += cpustat[CPUTIME_SOFTIRQ];
	}

	for (stat = 0; stat < CPUACCT_STAT_NSTATS; stat++) {
		seq_printf(sf, "%s %lld\n",
			   cpuacct_stat_desc[stat],
			   (long long)nsec_to_clock_t(val[stat]));
	}

	return 0;
}

static struct cftype files[] = {
	{
		.name = "usage",
		.read_u64 = cpuusage_read,
		.write_u64 = cpuusage_write,
	},
	{
		.name = "usage_user",
		.read_u64 = cpuusage_user_read,
	},
	{
		.name = "usage_sys",
		.read_u64 = cpuusage_sys_read,
	},
	{
		.name = "usage_percpu",
		.seq_show = cpuacct_percpu_seq_show,
	},
	{
		.name = "usage_percpu_user",
		.seq_show = cpuacct_percpu_user_seq_show,
	},
	{
		.name = "usage_percpu_sys",
		.seq_show = cpuacct_percpu_sys_seq_show,
	},
	{
		.name = "usage_all",
		.seq_show = cpuacct_all_seq_show,
	},
	{
		.name = "stat",
		.seq_show = cpuacct_stats_show,
	},
	{ }	/* terminate */
};

/*
 * charge this task's execution time to its accounting group.
 *
 * called with rq->lock held.
 */
void cpuacct_charge(struct task_struct *tsk, u64 cputime)
{
	struct cpuacct *ca;
	int index = CPUACCT_STAT_SYSTEM;
	struct pt_regs *regs = task_pt_regs(tsk);

	if (regs && user_mode(regs))
		index = CPUACCT_STAT_USER;

	rcu_read_lock();

	for (ca = task_ca(tsk); ca; ca = parent_ca(ca))
		this_cpu_ptr(ca->cpuusage)->usages[index] += cputime;

	rcu_read_unlock();
}

/*
 * Add user/system time to cpuacct.
 *
 * Note: it's the caller that updates the account of the root cgroup.
 */
void cpuacct_account_field(struct task_struct *tsk, int index, u64 val)
{
	struct cpuacct *ca;

	rcu_read_lock();
	for (ca = task_ca(tsk); ca != &root_cpuacct; ca = parent_ca(ca))
		this_cpu_ptr(ca->cpustat)->cpustat[index] += val;
	rcu_read_unlock();
}

struct cgroup_subsys cpuacct_cgrp_subsys = {
	.css_alloc	= cpuacct_css_alloc,
	.css_free	= cpuacct_css_free,
	.legacy_cftypes	= files,
	.early_init	= true,
};
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
2e76c24d LZ	2	#include <linux/cgroup.h>
	3	#include <linux/slab.h>
	4	#include <linux/percpu.h>
	5	#include <linux/spinlock.h>
	6	#include <linux/cpumask.h>
	7	#include <linux/seq_file.h>
	8	#include <linux/rcupdate.h>
	9	#include <linux/kernel_stat.h>
b329fd5b	10	#include <linux/err.h>
2e76c24d LZ	11
	12	#include "sched.h"
	13
	14	/*
	15	* CPU accounting code for task groups.
	16	*
	17	* Based on the work by Paul Menage (menage@google.com) and Balbir Singh
	18	* (balbir@in.ibm.com).
	19	*/
	20
d1712796 LZ	21	/* Time spent by the tasks of the cpu accounting group executing in ... */
	22	enum cpuacct_stat_index {
	23	CPUACCT_STAT_USER, /* ... user mode */
	24	CPUACCT_STAT_SYSTEM, /* ... kernel mode */
	25
	26	CPUACCT_STAT_NSTATS,
	27	};
	28
9acacc2a ZL	29	static const char * const cpuacct_stat_desc[] = {
	30	[CPUACCT_STAT_USER] = "user",
	31	[CPUACCT_STAT_SYSTEM] = "system",
d740037f DY	32	};
	33
	34	struct cpuacct_usage {
9acacc2a	35	u64 usages[CPUACCT_STAT_NSTATS];
d740037f DY	36	};
d740037f DY	37
d1712796 LZ	38	/* track cpu usage of a group of tasks and its child groups */
	39	struct cpuacct {
	40	struct cgroup_subsys_state css;
	41	/* cpuusage holds pointer to a u64-type object on every cpu */
d740037f	42	struct cpuacct_usage __percpu *cpuusage;
d1712796 LZ	43	struct kernel_cpustat __percpu *cpustat;
	44	};
	45
a7c6d554 TH	46	static inline struct cpuacct css_ca(struct cgroup_subsys_state css)
	47	{
	48	return css ? container_of(css, struct cpuacct, css) : NULL;
	49	}
	50
d1712796 LZ	51	/* return cpu accounting group to which this task belongs */
	52	static inline struct cpuacct task_ca(struct task_struct tsk)
	53	{
073219e9	54	return css_ca(task_css(tsk, cpuacct_cgrp_id));
d1712796 LZ	55	}
d1712796 LZ	56
d1712796 LZ	57	static inline struct cpuacct parent_ca(struct cpuacct ca)
d1712796 LZ	58	{
5c9d535b	59	return css_ca(ca->css.parent);
d1712796 LZ	60	}
d1712796 LZ	61
d740037f	62	static DEFINE_PER_CPU(struct cpuacct_usage, root_cpuacct_cpuusage);
14c6d3c8 LZ	63	static struct cpuacct root_cpuacct = {
	64	.cpustat = &kernel_cpustat,
	65	.cpuusage = &root_cpuacct_cpuusage,
	66	};
2e76c24d LZ	67
2e76c24d LZ	68	/* create a new cpu accounting group */
eb95419b TH	69	static struct cgroup_subsys_state *
eb95419b TH	70	cpuacct_css_alloc(struct cgroup_subsys_state *parent_css)
2e76c24d LZ	71	{
	72	struct cpuacct *ca;
	73
eb95419b	74	if (!parent_css)
2e76c24d LZ	75	return &root_cpuacct.css;
	76
	77	ca = kzalloc(sizeof(*ca), GFP_KERNEL);
	78	if (!ca)
	79	goto out;
	80
d740037f	81	ca->cpuusage = alloc_percpu(struct cpuacct_usage);
2e76c24d LZ	82	if (!ca->cpuusage)
	83	goto out_free_ca;
	84
	85	ca->cpustat = alloc_percpu(struct kernel_cpustat);
	86	if (!ca->cpustat)
	87	goto out_free_cpuusage;
	88
	89	return &ca->css;
	90
	91	out_free_cpuusage:
	92	free_percpu(ca->cpuusage);
	93	out_free_ca:
	94	kfree(ca);
	95	out:
	96	return ERR_PTR(-ENOMEM);
	97	}
	98
	99	/* destroy an existing cpu accounting group */
eb95419b	100	static void cpuacct_css_free(struct cgroup_subsys_state *css)
2e76c24d	101	{
eb95419b	102	struct cpuacct *ca = css_ca(css);
2e76c24d LZ	103
	104	free_percpu(ca->cpustat);
	105	free_percpu(ca->cpuusage);
	106	kfree(ca);
	107	}
	108
d740037f	109	static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu,
9acacc2a	110	enum cpuacct_stat_index index)
2e76c24d	111	{
d740037f	112	struct cpuacct_usage *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
2e76c24d LZ	113	u64 data;
2e76c24d LZ	114
d740037f	115	/*
9acacc2a	116	* We allow index == CPUACCT_STAT_NSTATS here to read
d740037f DY	117	* the sum of suages.
d740037f DY	118	*/
9acacc2a	119	BUG_ON(index > CPUACCT_STAT_NSTATS);
d740037f	120
2e76c24d LZ	121	#ifndef CONFIG_64BIT
	122	/*
	123	* Take rq->lock to make 64-bit read safe on 32-bit platforms.
	124	*/
	125	raw_spin_lock_irq(&cpu_rq(cpu)->lock);
d740037f DY	126	#endif
d740037f DY	127
9acacc2a	128	if (index == CPUACCT_STAT_NSTATS) {
d740037f DY	129	int i = 0;
	130
	131	data = 0;
9acacc2a	132	for (i = 0; i < CPUACCT_STAT_NSTATS; i++)
d740037f DY	133	data += cpuusage->usages[i];
	134	} else {
	135	data = cpuusage->usages[index];
	136	}
	137
	138	#ifndef CONFIG_64BIT
2e76c24d	139	raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
2e76c24d LZ	140	#endif
	141
	142	return data;
	143	}
	144
	145	static void cpuacct_cpuusage_write(struct cpuacct *ca, int cpu, u64 val)
	146	{
d740037f DY	147	struct cpuacct_usage *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
d740037f DY	148	int i;
2e76c24d LZ	149
	150	#ifndef CONFIG_64BIT
	151	/*
	152	* Take rq->lock to make 64-bit write safe on 32-bit platforms.
	153	*/
	154	raw_spin_lock_irq(&cpu_rq(cpu)->lock);
d740037f DY	155	#endif
d740037f DY	156
9acacc2a	157	for (i = 0; i < CPUACCT_STAT_NSTATS; i++)
d740037f DY	158	cpuusage->usages[i] = val;
	159
	160	#ifndef CONFIG_64BIT
2e76c24d	161	raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
2e76c24d LZ	162	#endif
	163	}
	164
	165	/* return total cpu usage (in nanoseconds) of a group */
d740037f	166	static u64 __cpuusage_read(struct cgroup_subsys_state *css,
9acacc2a	167	enum cpuacct_stat_index index)
2e76c24d	168	{
182446d0	169	struct cpuacct *ca = css_ca(css);
2e76c24d LZ	170	u64 totalcpuusage = 0;
	171	int i;
	172
5ca3726a	173	for_each_possible_cpu(i)
d740037f	174	totalcpuusage += cpuacct_cpuusage_read(ca, i, index);
2e76c24d LZ	175
	176	return totalcpuusage;
	177	}
	178
d740037f DY	179	static u64 cpuusage_user_read(struct cgroup_subsys_state *css,
	180	struct cftype *cft)
	181	{
9acacc2a	182	return __cpuusage_read(css, CPUACCT_STAT_USER);
d740037f DY	183	}
	184
	185	static u64 cpuusage_sys_read(struct cgroup_subsys_state *css,
	186	struct cftype *cft)
	187	{
9acacc2a	188	return __cpuusage_read(css, CPUACCT_STAT_SYSTEM);
d740037f DY	189	}
	190
	191	static u64 cpuusage_read(struct cgroup_subsys_state css, struct cftype cft)
	192	{
9acacc2a	193	return __cpuusage_read(css, CPUACCT_STAT_NSTATS);
d740037f DY	194	}
d740037f DY	195
182446d0	196	static int cpuusage_write(struct cgroup_subsys_state css, struct cftype cft,
1a736b77	197	u64 val)
2e76c24d	198	{
182446d0	199	struct cpuacct *ca = css_ca(css);
d740037f	200	int cpu;
2e76c24d	201
1a736b77 DY	202	/*
	203	* Only allow '0' here to do a reset.
	204	*/
d740037f DY	205	if (val)
d740037f DY	206	return -EINVAL;
2e76c24d	207
d740037f DY	208	for_each_possible_cpu(cpu)
d740037f DY	209	cpuacct_cpuusage_write(ca, cpu, 0);
2e76c24d	210
d740037f	211	return 0;
2e76c24d LZ	212	}
2e76c24d LZ	213
d740037f	214	static int __cpuacct_percpu_seq_show(struct seq_file *m,
9acacc2a	215	enum cpuacct_stat_index index)
2e76c24d	216	{
2da8ca82	217	struct cpuacct *ca = css_ca(seq_css(m));
2e76c24d LZ	218	u64 percpu;
	219	int i;
	220
5ca3726a	221	for_each_possible_cpu(i) {
d740037f	222	percpu = cpuacct_cpuusage_read(ca, i, index);
2e76c24d LZ	223	seq_printf(m, "%llu ", (unsigned long long) percpu);
	224	}
	225	seq_printf(m, "\n");
	226	return 0;
	227	}
	228
d740037f DY	229	static int cpuacct_percpu_user_seq_show(struct seq_file m, void V)
d740037f DY	230	{
9acacc2a	231	return __cpuacct_percpu_seq_show(m, CPUACCT_STAT_USER);
d740037f DY	232	}
	233
	234	static int cpuacct_percpu_sys_seq_show(struct seq_file m, void V)
	235	{
9acacc2a	236	return __cpuacct_percpu_seq_show(m, CPUACCT_STAT_SYSTEM);
d740037f DY	237	}
	238
	239	static int cpuacct_percpu_seq_show(struct seq_file m, void V)
	240	{
9acacc2a	241	return __cpuacct_percpu_seq_show(m, CPUACCT_STAT_NSTATS);
d740037f DY	242	}
d740037f DY	243
277a13e4 ZL	244	static int cpuacct_all_seq_show(struct seq_file m, void V)
	245	{
	246	struct cpuacct *ca = css_ca(seq_css(m));
	247	int index;
	248	int cpu;
	249
	250	seq_puts(m, "cpu");
	251	for (index = 0; index < CPUACCT_STAT_NSTATS; index++)
	252	seq_printf(m, " %s", cpuacct_stat_desc[index]);
	253	seq_puts(m, "\n");
	254
	255	for_each_possible_cpu(cpu) {
	256	struct cpuacct_usage *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
	257
	258	seq_printf(m, "%d", cpu);
	259
	260	for (index = 0; index < CPUACCT_STAT_NSTATS; index++) {
	261	#ifndef CONFIG_64BIT
	262	/*
	263	* Take rq->lock to make 64-bit read safe on 32-bit
	264	* platforms.
	265	*/
	266	raw_spin_lock_irq(&cpu_rq(cpu)->lock);
	267	#endif
	268
	269	seq_printf(m, " %llu", cpuusage->usages[index]);
	270
	271	#ifndef CONFIG_64BIT
	272	raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
	273	#endif
	274	}
	275	seq_puts(m, "\n");
	276	}
	277	return 0;
	278	}
	279
2da8ca82	280	static int cpuacct_stats_show(struct seq_file sf, void v)
2e76c24d	281	{
2da8ca82	282	struct cpuacct *ca = css_ca(seq_css(sf));
8e546bfa	283	s64 val[CPUACCT_STAT_NSTATS];
2e76c24d	284	int cpu;
8e546bfa	285	int stat;
2e76c24d	286
8e546bfa	287	memset(val, 0, sizeof(val));
5ca3726a	288	for_each_possible_cpu(cpu) {
8e546bfa	289	u64 *cpustat = per_cpu_ptr(ca->cpustat, cpu)->cpustat;
2e76c24d	290
8e546bfa ZL	291	val[CPUACCT_STAT_USER] += cpustat[CPUTIME_USER];
	292	val[CPUACCT_STAT_USER] += cpustat[CPUTIME_NICE];
	293	val[CPUACCT_STAT_SYSTEM] += cpustat[CPUTIME_SYSTEM];
	294	val[CPUACCT_STAT_SYSTEM] += cpustat[CPUTIME_IRQ];
	295	val[CPUACCT_STAT_SYSTEM] += cpustat[CPUTIME_SOFTIRQ];
2e76c24d LZ	296	}
2e76c24d LZ	297
8e546bfa ZL	298	for (stat = 0; stat < CPUACCT_STAT_NSTATS; stat++) {
	299	seq_printf(sf, "%s %lld\n",
	300	cpuacct_stat_desc[stat],
7fb1327e	301	(long long)nsec_to_clock_t(val[stat]));
8e546bfa	302	}
2e76c24d LZ	303
	304	return 0;
	305	}
	306
	307	static struct cftype files[] = {
	308	{
	309	.name = "usage",
	310	.read_u64 = cpuusage_read,
	311	.write_u64 = cpuusage_write,
	312	},
d740037f DY	313	{
	314	.name = "usage_user",
	315	.read_u64 = cpuusage_user_read,
	316	},
	317	{
	318	.name = "usage_sys",
	319	.read_u64 = cpuusage_sys_read,
	320	},
2e76c24d LZ	321	{
2e76c24d LZ	322	.name = "usage_percpu",
2da8ca82	323	.seq_show = cpuacct_percpu_seq_show,
2e76c24d	324	},
d740037f DY	325	{
	326	.name = "usage_percpu_user",
	327	.seq_show = cpuacct_percpu_user_seq_show,
	328	},
	329	{
	330	.name = "usage_percpu_sys",
	331	.seq_show = cpuacct_percpu_sys_seq_show,
	332	},
277a13e4 ZL	333	{
	334	.name = "usage_all",
	335	.seq_show = cpuacct_all_seq_show,
	336	},
2e76c24d LZ	337	{
2e76c24d LZ	338	.name = "stat",
2da8ca82	339	.seq_show = cpuacct_stats_show,
2e76c24d LZ	340	},
	341	{ } /* terminate */
	342	};
	343
	344	/*
	345	* charge this task's execution time to its accounting group.
	346	*
	347	* called with rq->lock held.
	348	*/
	349	void cpuacct_charge(struct task_struct *tsk, u64 cputime)
	350	{
	351	struct cpuacct *ca;
9acacc2a	352	int index = CPUACCT_STAT_SYSTEM;
bd928830	353	struct pt_regs *regs = task_pt_regs(tsk);
d740037f	354
bd928830	355	if (regs && user_mode(regs))
9acacc2a	356	index = CPUACCT_STAT_USER;
2e76c24d LZ	357
2e76c24d LZ	358	rcu_read_lock();
d740037f	359
73e6aafd	360	for (ca = task_ca(tsk); ca; ca = parent_ca(ca))
d740037f DY	361	this_cpu_ptr(ca->cpuusage)->usages[index] += cputime;
d740037f DY	362
2e76c24d LZ	363	rcu_read_unlock();
	364	}
	365
1966aaf7 LZ	366	/*
	367	* Add user/system time to cpuacct.
	368	*
	369	* Note: it's the caller that updates the account of the root cgroup.
	370	*/
73e6aafd	371	void cpuacct_account_field(struct task_struct *tsk, int index, u64 val)
1966aaf7	372	{
1966aaf7 LZ	373	struct cpuacct *ca;
1966aaf7 LZ	374
1966aaf7	375	rcu_read_lock();
73e6aafd ZL	376	for (ca = task_ca(tsk); ca != &root_cpuacct; ca = parent_ca(ca))
73e6aafd ZL	377	this_cpu_ptr(ca->cpustat)->cpustat[index] += val;
1966aaf7 LZ	378	rcu_read_unlock();
	379	}
	380
073219e9	381	struct cgroup_subsys cpuacct_cgrp_subsys = {
621e2de0 LZ	382	.css_alloc = cpuacct_css_alloc,
621e2de0 LZ	383	.css_free = cpuacct_css_free,
5577964e	384	.legacy_cftypes = files,
b38e42e9	385	.early_init = true,
2e76c24d	386	};