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1#include <linux/cgroup.h>
2#include <linux/slab.h>
3#include <linux/percpu.h>
4#include <linux/spinlock.h>
5#include <linux/cpumask.h>
6#include <linux/seq_file.h>
7#include <linux/rcupdate.h>
8#include <linux/kernel_stat.h>
9#include <linux/err.h>
10
11#include "sched.h"
12
13/*
14 * CPU accounting code for task groups.
15 *
16 * Based on the work by Paul Menage (menage@google.com) and Balbir Singh
17 * (balbir@in.ibm.com).
18 */
19
20/* Time spent by the tasks of the cpu accounting group executing in ... */
21enum cpuacct_stat_index {
22 CPUACCT_STAT_USER, /* ... user mode */
23 CPUACCT_STAT_SYSTEM, /* ... kernel mode */
24
25 CPUACCT_STAT_NSTATS,
26};
27
28/* track cpu usage of a group of tasks and its child groups */
29struct cpuacct {
30 struct cgroup_subsys_state css;
31 /* cpuusage holds pointer to a u64-type object on every cpu */
32 u64 __percpu *cpuusage;
33 struct kernel_cpustat __percpu *cpustat;
34};
35
36static inline struct cpuacct *css_ca(struct cgroup_subsys_state *css)
37{
38 return css ? container_of(css, struct cpuacct, css) : NULL;
39}
40
41/* return cpu accounting group to which this task belongs */
42static inline struct cpuacct *task_ca(struct task_struct *tsk)
43{
44 return css_ca(task_css(tsk, cpuacct_cgrp_id));
45}
46
47static inline struct cpuacct *parent_ca(struct cpuacct *ca)
48{
49 return css_ca(css_parent(&ca->css));
50}
51
52static DEFINE_PER_CPU(u64, root_cpuacct_cpuusage);
53static struct cpuacct root_cpuacct = {
54 .cpustat = &kernel_cpustat,
55 .cpuusage = &root_cpuacct_cpuusage,
56};
57
58/* create a new cpu accounting group */
59static struct cgroup_subsys_state *
60cpuacct_css_alloc(struct cgroup_subsys_state *parent_css)
61{
62 struct cpuacct *ca;
63
64 if (!parent_css)
65 return &root_cpuacct.css;
66
67 ca = kzalloc(sizeof(*ca), GFP_KERNEL);
68 if (!ca)
69 goto out;
70
71 ca->cpuusage = alloc_percpu(u64);
72 if (!ca->cpuusage)
73 goto out_free_ca;
74
75 ca->cpustat = alloc_percpu(struct kernel_cpustat);
76 if (!ca->cpustat)
77 goto out_free_cpuusage;
78
79 return &ca->css;
80
81out_free_cpuusage:
82 free_percpu(ca->cpuusage);
83out_free_ca:
84 kfree(ca);
85out:
86 return ERR_PTR(-ENOMEM);
87}
88
89/* destroy an existing cpu accounting group */
90static void cpuacct_css_free(struct cgroup_subsys_state *css)
91{
92 struct cpuacct *ca = css_ca(css);
93
94 free_percpu(ca->cpustat);
95 free_percpu(ca->cpuusage);
96 kfree(ca);
97}
98
99static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu)
100{
101 u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
102 u64 data;
103
104#ifndef CONFIG_64BIT
105 /*
106 * Take rq->lock to make 64-bit read safe on 32-bit platforms.
107 */
108 raw_spin_lock_irq(&cpu_rq(cpu)->lock);
109 data = *cpuusage;
110 raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
111#else
112 data = *cpuusage;
113#endif
114
115 return data;
116}
117
118static void cpuacct_cpuusage_write(struct cpuacct *ca, int cpu, u64 val)
119{
120 u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
121
122#ifndef CONFIG_64BIT
123 /*
124 * Take rq->lock to make 64-bit write safe on 32-bit platforms.
125 */
126 raw_spin_lock_irq(&cpu_rq(cpu)->lock);
127 *cpuusage = val;
128 raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
129#else
130 *cpuusage = val;
131#endif
132}
133
134/* return total cpu usage (in nanoseconds) of a group */
135static u64 cpuusage_read(struct cgroup_subsys_state *css, struct cftype *cft)
136{
137 struct cpuacct *ca = css_ca(css);
138 u64 totalcpuusage = 0;
139 int i;
140
141 for_each_present_cpu(i)
142 totalcpuusage += cpuacct_cpuusage_read(ca, i);
143
144 return totalcpuusage;
145}
146
147static int cpuusage_write(struct cgroup_subsys_state *css, struct cftype *cft,
148 u64 reset)
149{
150 struct cpuacct *ca = css_ca(css);
151 int err = 0;
152 int i;
153
154 if (reset) {
155 err = -EINVAL;
156 goto out;
157 }
158
159 for_each_present_cpu(i)
160 cpuacct_cpuusage_write(ca, i, 0);
161
162out:
163 return err;
164}
165
166static int cpuacct_percpu_seq_show(struct seq_file *m, void *V)
167{
168 struct cpuacct *ca = css_ca(seq_css(m));
169 u64 percpu;
170 int i;
171
172 for_each_present_cpu(i) {
173 percpu = cpuacct_cpuusage_read(ca, i);
174 seq_printf(m, "%llu ", (unsigned long long) percpu);
175 }
176 seq_printf(m, "\n");
177 return 0;
178}
179
180static const char * const cpuacct_stat_desc[] = {
181 [CPUACCT_STAT_USER] = "user",
182 [CPUACCT_STAT_SYSTEM] = "system",
183};
184
185static int cpuacct_stats_show(struct seq_file *sf, void *v)
186{
187 struct cpuacct *ca = css_ca(seq_css(sf));
188 int cpu;
189 s64 val = 0;
190
191 for_each_online_cpu(cpu) {
192 struct kernel_cpustat *kcpustat = per_cpu_ptr(ca->cpustat, cpu);
193 val += kcpustat->cpustat[CPUTIME_USER];
194 val += kcpustat->cpustat[CPUTIME_NICE];
195 }
196 val = cputime64_to_clock_t(val);
197 seq_printf(sf, "%s %lld\n", cpuacct_stat_desc[CPUACCT_STAT_USER], val);
198
199 val = 0;
200 for_each_online_cpu(cpu) {
201 struct kernel_cpustat *kcpustat = per_cpu_ptr(ca->cpustat, cpu);
202 val += kcpustat->cpustat[CPUTIME_SYSTEM];
203 val += kcpustat->cpustat[CPUTIME_IRQ];
204 val += kcpustat->cpustat[CPUTIME_SOFTIRQ];
205 }
206
207 val = cputime64_to_clock_t(val);
208 seq_printf(sf, "%s %lld\n", cpuacct_stat_desc[CPUACCT_STAT_SYSTEM], val);
209
210 return 0;
211}
212
213static struct cftype files[] = {
214 {
215 .name = "usage",
216 .read_u64 = cpuusage_read,
217 .write_u64 = cpuusage_write,
218 },
219 {
220 .name = "usage_percpu",
221 .seq_show = cpuacct_percpu_seq_show,
222 },
223 {
224 .name = "stat",
225 .seq_show = cpuacct_stats_show,
226 },
227 { } /* terminate */
228};
229
230/*
231 * charge this task's execution time to its accounting group.
232 *
233 * called with rq->lock held.
234 */
235void cpuacct_charge(struct task_struct *tsk, u64 cputime)
236{
237 struct cpuacct *ca;
238 int cpu;
239
240 cpu = task_cpu(tsk);
241
242 rcu_read_lock();
243
244 ca = task_ca(tsk);
245
246 while (true) {
247 u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
248 *cpuusage += cputime;
249
250 ca = parent_ca(ca);
251 if (!ca)
252 break;
253 }
254
255 rcu_read_unlock();
256}
257
258/*
259 * Add user/system time to cpuacct.
260 *
261 * Note: it's the caller that updates the account of the root cgroup.
262 */
263void cpuacct_account_field(struct task_struct *p, int index, u64 val)
264{
265 struct kernel_cpustat *kcpustat;
266 struct cpuacct *ca;
267
268 rcu_read_lock();
269 ca = task_ca(p);
270 while (ca != &root_cpuacct) {
271 kcpustat = this_cpu_ptr(ca->cpustat);
272 kcpustat->cpustat[index] += val;
273 ca = parent_ca(ca);
274 }
275 rcu_read_unlock();
276}
277
278struct cgroup_subsys cpuacct_cgrp_subsys = {
279 .css_alloc = cpuacct_css_alloc,
280 .css_free = cpuacct_css_free,
281 .base_cftypes = files,
282 .early_init = 1,
283};
1#include <linux/cgroup.h>
2#include <linux/slab.h>
3#include <linux/percpu.h>
4#include <linux/spinlock.h>
5#include <linux/cpumask.h>
6#include <linux/seq_file.h>
7#include <linux/rcupdate.h>
8#include <linux/kernel_stat.h>
9#include <linux/err.h>
10
11#include "sched.h"
12
13/*
14 * CPU accounting code for task groups.
15 *
16 * Based on the work by Paul Menage (menage@google.com) and Balbir Singh
17 * (balbir@in.ibm.com).
18 */
19
20/* Time spent by the tasks of the cpu accounting group executing in ... */
21enum cpuacct_stat_index {
22 CPUACCT_STAT_USER, /* ... user mode */
23 CPUACCT_STAT_SYSTEM, /* ... kernel mode */
24
25 CPUACCT_STAT_NSTATS,
26};
27
28/* track cpu usage of a group of tasks and its child groups */
29struct cpuacct {
30 struct cgroup_subsys_state css;
31 /* cpuusage holds pointer to a u64-type object on every cpu */
32 u64 __percpu *cpuusage;
33 struct kernel_cpustat __percpu *cpustat;
34};
35
36static inline struct cpuacct *css_ca(struct cgroup_subsys_state *css)
37{
38 return css ? container_of(css, struct cpuacct, css) : NULL;
39}
40
41/* return cpu accounting group to which this task belongs */
42static inline struct cpuacct *task_ca(struct task_struct *tsk)
43{
44 return css_ca(task_css(tsk, cpuacct_cgrp_id));
45}
46
47static inline struct cpuacct *parent_ca(struct cpuacct *ca)
48{
49 return css_ca(ca->css.parent);
50}
51
52static DEFINE_PER_CPU(u64, root_cpuacct_cpuusage);
53static struct cpuacct root_cpuacct = {
54 .cpustat = &kernel_cpustat,
55 .cpuusage = &root_cpuacct_cpuusage,
56};
57
58/* create a new cpu accounting group */
59static struct cgroup_subsys_state *
60cpuacct_css_alloc(struct cgroup_subsys_state *parent_css)
61{
62 struct cpuacct *ca;
63
64 if (!parent_css)
65 return &root_cpuacct.css;
66
67 ca = kzalloc(sizeof(*ca), GFP_KERNEL);
68 if (!ca)
69 goto out;
70
71 ca->cpuusage = alloc_percpu(u64);
72 if (!ca->cpuusage)
73 goto out_free_ca;
74
75 ca->cpustat = alloc_percpu(struct kernel_cpustat);
76 if (!ca->cpustat)
77 goto out_free_cpuusage;
78
79 return &ca->css;
80
81out_free_cpuusage:
82 free_percpu(ca->cpuusage);
83out_free_ca:
84 kfree(ca);
85out:
86 return ERR_PTR(-ENOMEM);
87}
88
89/* destroy an existing cpu accounting group */
90static void cpuacct_css_free(struct cgroup_subsys_state *css)
91{
92 struct cpuacct *ca = css_ca(css);
93
94 free_percpu(ca->cpustat);
95 free_percpu(ca->cpuusage);
96 kfree(ca);
97}
98
99static u64 cpuacct_cpuusage_read(struct cpuacct *ca, int cpu)
100{
101 u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
102 u64 data;
103
104#ifndef CONFIG_64BIT
105 /*
106 * Take rq->lock to make 64-bit read safe on 32-bit platforms.
107 */
108 raw_spin_lock_irq(&cpu_rq(cpu)->lock);
109 data = *cpuusage;
110 raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
111#else
112 data = *cpuusage;
113#endif
114
115 return data;
116}
117
118static void cpuacct_cpuusage_write(struct cpuacct *ca, int cpu, u64 val)
119{
120 u64 *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
121
122#ifndef CONFIG_64BIT
123 /*
124 * Take rq->lock to make 64-bit write safe on 32-bit platforms.
125 */
126 raw_spin_lock_irq(&cpu_rq(cpu)->lock);
127 *cpuusage = val;
128 raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
129#else
130 *cpuusage = val;
131#endif
132}
133
134/* return total cpu usage (in nanoseconds) of a group */
135static u64 cpuusage_read(struct cgroup_subsys_state *css, struct cftype *cft)
136{
137 struct cpuacct *ca = css_ca(css);
138 u64 totalcpuusage = 0;
139 int i;
140
141 for_each_present_cpu(i)
142 totalcpuusage += cpuacct_cpuusage_read(ca, i);
143
144 return totalcpuusage;
145}
146
147static int cpuusage_write(struct cgroup_subsys_state *css, struct cftype *cft,
148 u64 val)
149{
150 struct cpuacct *ca = css_ca(css);
151 int err = 0;
152 int i;
153
154 /*
155 * Only allow '0' here to do a reset.
156 */
157 if (val) {
158 err = -EINVAL;
159 goto out;
160 }
161
162 for_each_present_cpu(i)
163 cpuacct_cpuusage_write(ca, i, 0);
164
165out:
166 return err;
167}
168
169static int cpuacct_percpu_seq_show(struct seq_file *m, void *V)
170{
171 struct cpuacct *ca = css_ca(seq_css(m));
172 u64 percpu;
173 int i;
174
175 for_each_present_cpu(i) {
176 percpu = cpuacct_cpuusage_read(ca, i);
177 seq_printf(m, "%llu ", (unsigned long long) percpu);
178 }
179 seq_printf(m, "\n");
180 return 0;
181}
182
183static const char * const cpuacct_stat_desc[] = {
184 [CPUACCT_STAT_USER] = "user",
185 [CPUACCT_STAT_SYSTEM] = "system",
186};
187
188static int cpuacct_stats_show(struct seq_file *sf, void *v)
189{
190 struct cpuacct *ca = css_ca(seq_css(sf));
191 int cpu;
192 s64 val = 0;
193
194 for_each_online_cpu(cpu) {
195 struct kernel_cpustat *kcpustat = per_cpu_ptr(ca->cpustat, cpu);
196 val += kcpustat->cpustat[CPUTIME_USER];
197 val += kcpustat->cpustat[CPUTIME_NICE];
198 }
199 val = cputime64_to_clock_t(val);
200 seq_printf(sf, "%s %lld\n", cpuacct_stat_desc[CPUACCT_STAT_USER], val);
201
202 val = 0;
203 for_each_online_cpu(cpu) {
204 struct kernel_cpustat *kcpustat = per_cpu_ptr(ca->cpustat, cpu);
205 val += kcpustat->cpustat[CPUTIME_SYSTEM];
206 val += kcpustat->cpustat[CPUTIME_IRQ];
207 val += kcpustat->cpustat[CPUTIME_SOFTIRQ];
208 }
209
210 val = cputime64_to_clock_t(val);
211 seq_printf(sf, "%s %lld\n", cpuacct_stat_desc[CPUACCT_STAT_SYSTEM], val);
212
213 return 0;
214}
215
216static struct cftype files[] = {
217 {
218 .name = "usage",
219 .read_u64 = cpuusage_read,
220 .write_u64 = cpuusage_write,
221 },
222 {
223 .name = "usage_percpu",
224 .seq_show = cpuacct_percpu_seq_show,
225 },
226 {
227 .name = "stat",
228 .seq_show = cpuacct_stats_show,
229 },
230 { } /* terminate */
231};
232
233/*
234 * charge this task's execution time to its accounting group.
235 *
236 * called with rq->lock held.
237 */
238void cpuacct_charge(struct task_struct *tsk, u64 cputime)
239{
240 struct cpuacct *ca;
241
242 rcu_read_lock();
243 for (ca = task_ca(tsk); ca; ca = parent_ca(ca))
244 *this_cpu_ptr(ca->cpuusage) += cputime;
245 rcu_read_unlock();
246}
247
248/*
249 * Add user/system time to cpuacct.
250 *
251 * Note: it's the caller that updates the account of the root cgroup.
252 */
253void cpuacct_account_field(struct task_struct *tsk, int index, u64 val)
254{
255 struct cpuacct *ca;
256
257 rcu_read_lock();
258 for (ca = task_ca(tsk); ca != &root_cpuacct; ca = parent_ca(ca))
259 this_cpu_ptr(ca->cpustat)->cpustat[index] += val;
260 rcu_read_unlock();
261}
262
263struct cgroup_subsys cpuacct_cgrp_subsys = {
264 .css_alloc = cpuacct_css_alloc,
265 .css_free = cpuacct_css_free,
266 .legacy_cftypes = files,
267 .early_init = true,
268};