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