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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
32ef5517 IM |
2 | #ifndef _LINUX_SCHED_CPUTIME_H |
3 | #define _LINUX_SCHED_CPUTIME_H | |
4 | ||
5 | #include <linux/sched/signal.h> | |
1050b27c IM |
6 | |
7 | /* | |
8 | * cputime accounting APIs: | |
9 | */ | |
10 | ||
11 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
12 | #include <asm/cputime.h> | |
13 | ||
14 | #ifndef cputime_to_nsecs | |
15 | # define cputime_to_nsecs(__ct) \ | |
16 | (cputime_to_usecs(__ct) * NSEC_PER_USEC) | |
17 | #endif | |
18 | #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ | |
19 | ||
20 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN | |
21 | extern void task_cputime(struct task_struct *t, | |
22 | u64 *utime, u64 *stime); | |
23 | extern u64 task_gtime(struct task_struct *t); | |
24 | #else | |
25 | static inline void task_cputime(struct task_struct *t, | |
26 | u64 *utime, u64 *stime) | |
27 | { | |
28 | *utime = t->utime; | |
29 | *stime = t->stime; | |
30 | } | |
31 | ||
32 | static inline u64 task_gtime(struct task_struct *t) | |
33 | { | |
34 | return t->gtime; | |
35 | } | |
36 | #endif | |
37 | ||
38 | #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME | |
39 | static inline void task_cputime_scaled(struct task_struct *t, | |
40 | u64 *utimescaled, | |
41 | u64 *stimescaled) | |
42 | { | |
43 | *utimescaled = t->utimescaled; | |
44 | *stimescaled = t->stimescaled; | |
45 | } | |
46 | #else | |
47 | static inline void task_cputime_scaled(struct task_struct *t, | |
48 | u64 *utimescaled, | |
49 | u64 *stimescaled) | |
50 | { | |
51 | task_cputime(t, utimescaled, stimescaled); | |
52 | } | |
53 | #endif | |
54 | ||
55 | extern void task_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st); | |
56 | extern void thread_group_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st); | |
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57 | extern void cputime_adjust(struct task_cputime *curr, struct prev_cputime *prev, |
58 | u64 *ut, u64 *st); | |
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59 | |
60 | /* | |
61 | * Thread group CPU time accounting. | |
62 | */ | |
63 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); | |
64 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); | |
65 | ||
66 | ||
67 | /* | |
68 | * The following are functions that support scheduler-internal time accounting. | |
69 | * These functions are generally called at the timer tick. None of this depends | |
70 | * on CONFIG_SCHEDSTATS. | |
71 | */ | |
72 | ||
73 | /** | |
74 | * get_running_cputimer - return &tsk->signal->cputimer if cputimer is running | |
75 | * | |
76 | * @tsk: Pointer to target task. | |
77 | */ | |
78 | #ifdef CONFIG_POSIX_TIMERS | |
79 | static inline | |
80 | struct thread_group_cputimer *get_running_cputimer(struct task_struct *tsk) | |
81 | { | |
82 | struct thread_group_cputimer *cputimer = &tsk->signal->cputimer; | |
83 | ||
84 | /* Check if cputimer isn't running. This is accessed without locking. */ | |
85 | if (!READ_ONCE(cputimer->running)) | |
86 | return NULL; | |
87 | ||
88 | /* | |
89 | * After we flush the task's sum_exec_runtime to sig->sum_sched_runtime | |
90 | * in __exit_signal(), we won't account to the signal struct further | |
91 | * cputime consumed by that task, even though the task can still be | |
92 | * ticking after __exit_signal(). | |
93 | * | |
94 | * In order to keep a consistent behaviour between thread group cputime | |
95 | * and thread group cputimer accounting, lets also ignore the cputime | |
96 | * elapsing after __exit_signal() in any thread group timer running. | |
97 | * | |
98 | * This makes sure that POSIX CPU clocks and timers are synchronized, so | |
99 | * that a POSIX CPU timer won't expire while the corresponding POSIX CPU | |
100 | * clock delta is behind the expiring timer value. | |
101 | */ | |
102 | if (unlikely(!tsk->sighand)) | |
103 | return NULL; | |
104 | ||
105 | return cputimer; | |
106 | } | |
107 | #else | |
108 | static inline | |
109 | struct thread_group_cputimer *get_running_cputimer(struct task_struct *tsk) | |
110 | { | |
111 | return NULL; | |
112 | } | |
113 | #endif | |
114 | ||
115 | /** | |
116 | * account_group_user_time - Maintain utime for a thread group. | |
117 | * | |
118 | * @tsk: Pointer to task structure. | |
119 | * @cputime: Time value by which to increment the utime field of the | |
120 | * thread_group_cputime structure. | |
121 | * | |
122 | * If thread group time is being maintained, get the structure for the | |
123 | * running CPU and update the utime field there. | |
124 | */ | |
125 | static inline void account_group_user_time(struct task_struct *tsk, | |
126 | u64 cputime) | |
127 | { | |
128 | struct thread_group_cputimer *cputimer = get_running_cputimer(tsk); | |
129 | ||
130 | if (!cputimer) | |
131 | return; | |
132 | ||
133 | atomic64_add(cputime, &cputimer->cputime_atomic.utime); | |
134 | } | |
135 | ||
136 | /** | |
137 | * account_group_system_time - Maintain stime for a thread group. | |
138 | * | |
139 | * @tsk: Pointer to task structure. | |
140 | * @cputime: Time value by which to increment the stime field of the | |
141 | * thread_group_cputime structure. | |
142 | * | |
143 | * If thread group time is being maintained, get the structure for the | |
144 | * running CPU and update the stime field there. | |
145 | */ | |
146 | static inline void account_group_system_time(struct task_struct *tsk, | |
147 | u64 cputime) | |
148 | { | |
149 | struct thread_group_cputimer *cputimer = get_running_cputimer(tsk); | |
150 | ||
151 | if (!cputimer) | |
152 | return; | |
153 | ||
154 | atomic64_add(cputime, &cputimer->cputime_atomic.stime); | |
155 | } | |
156 | ||
157 | /** | |
158 | * account_group_exec_runtime - Maintain exec runtime for a thread group. | |
159 | * | |
160 | * @tsk: Pointer to task structure. | |
161 | * @ns: Time value by which to increment the sum_exec_runtime field | |
162 | * of the thread_group_cputime structure. | |
163 | * | |
164 | * If thread group time is being maintained, get the structure for the | |
165 | * running CPU and update the sum_exec_runtime field there. | |
166 | */ | |
167 | static inline void account_group_exec_runtime(struct task_struct *tsk, | |
168 | unsigned long long ns) | |
169 | { | |
170 | struct thread_group_cputimer *cputimer = get_running_cputimer(tsk); | |
171 | ||
172 | if (!cputimer) | |
173 | return; | |
174 | ||
175 | atomic64_add(ns, &cputimer->cputime_atomic.sum_exec_runtime); | |
176 | } | |
177 | ||
178 | static inline void prev_cputime_init(struct prev_cputime *prev) | |
179 | { | |
180 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
181 | prev->utime = prev->stime = 0; | |
182 | raw_spin_lock_init(&prev->lock); | |
183 | #endif | |
184 | } | |
185 | ||
186 | extern unsigned long long | |
187 | task_sched_runtime(struct task_struct *task); | |
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188 | |
189 | #endif /* _LINUX_SCHED_CPUTIME_H */ |