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