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425e0968 IM |
1 | |
2 | #ifdef CONFIG_SCHEDSTATS | |
b5aadf7f | 3 | |
425e0968 IM |
4 | /* |
5 | * Expects runqueue lock to be held for atomicity of update | |
6 | */ | |
7 | static inline void | |
8 | rq_sched_info_arrive(struct rq *rq, unsigned long long delta) | |
9 | { | |
10 | if (rq) { | |
11 | rq->rq_sched_info.run_delay += delta; | |
2d72376b | 12 | rq->rq_sched_info.pcount++; |
425e0968 IM |
13 | } |
14 | } | |
15 | ||
16 | /* | |
17 | * Expects runqueue lock to be held for atomicity of update | |
18 | */ | |
19 | static inline void | |
20 | rq_sched_info_depart(struct rq *rq, unsigned long long delta) | |
21 | { | |
22 | if (rq) | |
9c2c4802 | 23 | rq->rq_cpu_time += delta; |
425e0968 | 24 | } |
46ac22ba AG |
25 | |
26 | static inline void | |
27 | rq_sched_info_dequeued(struct rq *rq, unsigned long long delta) | |
28 | { | |
29 | if (rq) | |
30 | rq->rq_sched_info.run_delay += delta; | |
31 | } | |
425e0968 IM |
32 | # define schedstat_inc(rq, field) do { (rq)->field++; } while (0) |
33 | # define schedstat_add(rq, field, amt) do { (rq)->field += (amt); } while (0) | |
c3c70119 | 34 | # define schedstat_set(var, val) do { var = (val); } while (0) |
425e0968 IM |
35 | #else /* !CONFIG_SCHEDSTATS */ |
36 | static inline void | |
37 | rq_sched_info_arrive(struct rq *rq, unsigned long long delta) | |
38 | {} | |
39 | static inline void | |
46ac22ba AG |
40 | rq_sched_info_dequeued(struct rq *rq, unsigned long long delta) |
41 | {} | |
42 | static inline void | |
425e0968 IM |
43 | rq_sched_info_depart(struct rq *rq, unsigned long long delta) |
44 | {} | |
45 | # define schedstat_inc(rq, field) do { } while (0) | |
46 | # define schedstat_add(rq, field, amt) do { } while (0) | |
c3c70119 | 47 | # define schedstat_set(var, val) do { } while (0) |
425e0968 IM |
48 | #endif |
49 | ||
9a41785c | 50 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
46ac22ba AG |
51 | static inline void sched_info_reset_dequeued(struct task_struct *t) |
52 | { | |
53 | t->sched_info.last_queued = 0; | |
54 | } | |
55 | ||
425e0968 | 56 | /* |
d4a6f3c3 | 57 | * We are interested in knowing how long it was from the *first* time a |
46ac22ba AG |
58 | * task was queued to the time that it finally hit a cpu, we call this routine |
59 | * from dequeue_task() to account for possible rq->clock skew across cpus. The | |
60 | * delta taken on each cpu would annul the skew. | |
425e0968 IM |
61 | */ |
62 | static inline void sched_info_dequeued(struct task_struct *t) | |
63 | { | |
78becc27 | 64 | unsigned long long now = rq_clock(task_rq(t)), delta = 0; |
46ac22ba AG |
65 | |
66 | if (unlikely(sched_info_on())) | |
67 | if (t->sched_info.last_queued) | |
68 | delta = now - t->sched_info.last_queued; | |
69 | sched_info_reset_dequeued(t); | |
70 | t->sched_info.run_delay += delta; | |
71 | ||
72 | rq_sched_info_dequeued(task_rq(t), delta); | |
425e0968 IM |
73 | } |
74 | ||
75 | /* | |
76 | * Called when a task finally hits the cpu. We can now calculate how | |
77 | * long it was waiting to run. We also note when it began so that we | |
78 | * can keep stats on how long its timeslice is. | |
79 | */ | |
80 | static void sched_info_arrive(struct task_struct *t) | |
81 | { | |
78becc27 | 82 | unsigned long long now = rq_clock(task_rq(t)), delta = 0; |
425e0968 IM |
83 | |
84 | if (t->sched_info.last_queued) | |
85 | delta = now - t->sched_info.last_queued; | |
46ac22ba | 86 | sched_info_reset_dequeued(t); |
425e0968 IM |
87 | t->sched_info.run_delay += delta; |
88 | t->sched_info.last_arrival = now; | |
2d72376b | 89 | t->sched_info.pcount++; |
425e0968 IM |
90 | |
91 | rq_sched_info_arrive(task_rq(t), delta); | |
92 | } | |
93 | ||
94 | /* | |
425e0968 IM |
95 | * This function is only called from enqueue_task(), but also only updates |
96 | * the timestamp if it is already not set. It's assumed that | |
97 | * sched_info_dequeued() will clear that stamp when appropriate. | |
98 | */ | |
99 | static inline void sched_info_queued(struct task_struct *t) | |
100 | { | |
101 | if (unlikely(sched_info_on())) | |
102 | if (!t->sched_info.last_queued) | |
78becc27 | 103 | t->sched_info.last_queued = rq_clock(task_rq(t)); |
425e0968 IM |
104 | } |
105 | ||
106 | /* | |
13b62e46 MT |
107 | * Called when a process ceases being the active-running process involuntarily |
108 | * due, typically, to expiring its time slice (this may also be called when | |
109 | * switching to the idle task). Now we can calculate how long we ran. | |
d4abc238 BR |
110 | * Also, if the process is still in the TASK_RUNNING state, call |
111 | * sched_info_queued() to mark that it has now again started waiting on | |
112 | * the runqueue. | |
425e0968 IM |
113 | */ |
114 | static inline void sched_info_depart(struct task_struct *t) | |
115 | { | |
78becc27 | 116 | unsigned long long delta = rq_clock(task_rq(t)) - |
9a41785c | 117 | t->sched_info.last_arrival; |
425e0968 | 118 | |
425e0968 | 119 | rq_sched_info_depart(task_rq(t), delta); |
d4abc238 BR |
120 | |
121 | if (t->state == TASK_RUNNING) | |
122 | sched_info_queued(t); | |
425e0968 IM |
123 | } |
124 | ||
125 | /* | |
126 | * Called when tasks are switched involuntarily due, typically, to expiring | |
127 | * their time slice. (This may also be called when switching to or from | |
128 | * the idle task.) We are only called when prev != next. | |
129 | */ | |
130 | static inline void | |
131 | __sched_info_switch(struct task_struct *prev, struct task_struct *next) | |
132 | { | |
133 | struct rq *rq = task_rq(prev); | |
134 | ||
135 | /* | |
136 | * prev now departs the cpu. It's not interesting to record | |
137 | * stats about how efficient we were at scheduling the idle | |
138 | * process, however. | |
139 | */ | |
140 | if (prev != rq->idle) | |
141 | sched_info_depart(prev); | |
142 | ||
143 | if (next != rq->idle) | |
144 | sched_info_arrive(next); | |
145 | } | |
146 | static inline void | |
147 | sched_info_switch(struct task_struct *prev, struct task_struct *next) | |
148 | { | |
149 | if (unlikely(sched_info_on())) | |
150 | __sched_info_switch(prev, next); | |
151 | } | |
152 | #else | |
46ac22ba AG |
153 | #define sched_info_queued(t) do { } while (0) |
154 | #define sched_info_reset_dequeued(t) do { } while (0) | |
155 | #define sched_info_dequeued(t) do { } while (0) | |
156 | #define sched_info_switch(t, next) do { } while (0) | |
9a41785c | 157 | #endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */ |
425e0968 | 158 | |
bb34d92f FM |
159 | /* |
160 | * The following are functions that support scheduler-internal time accounting. | |
161 | * These functions are generally called at the timer tick. None of this depends | |
162 | * on CONFIG_SCHEDSTATS. | |
163 | */ | |
164 | ||
fa18f7bd KM |
165 | /** |
166 | * cputimer_running - return true if cputimer is running | |
167 | * | |
168 | * @tsk: Pointer to target task. | |
169 | */ | |
170 | static inline bool cputimer_running(struct task_struct *tsk) | |
171 | ||
172 | { | |
173 | struct thread_group_cputimer *cputimer = &tsk->signal->cputimer; | |
174 | ||
175 | if (!cputimer->running) | |
176 | return false; | |
177 | ||
178 | /* | |
179 | * After we flush the task's sum_exec_runtime to sig->sum_sched_runtime | |
180 | * in __exit_signal(), we won't account to the signal struct further | |
181 | * cputime consumed by that task, even though the task can still be | |
182 | * ticking after __exit_signal(). | |
183 | * | |
184 | * In order to keep a consistent behaviour between thread group cputime | |
185 | * and thread group cputimer accounting, lets also ignore the cputime | |
186 | * elapsing after __exit_signal() in any thread group timer running. | |
187 | * | |
188 | * This makes sure that POSIX CPU clocks and timers are synchronized, so | |
189 | * that a POSIX CPU timer won't expire while the corresponding POSIX CPU | |
190 | * clock delta is behind the expiring timer value. | |
191 | */ | |
192 | if (unlikely(!tsk->sighand)) | |
193 | return false; | |
194 | ||
195 | return true; | |
196 | } | |
197 | ||
bb34d92f | 198 | /** |
7086efe1 | 199 | * account_group_user_time - Maintain utime for a thread group. |
bb34d92f | 200 | * |
7086efe1 FM |
201 | * @tsk: Pointer to task structure. |
202 | * @cputime: Time value by which to increment the utime field of the | |
203 | * thread_group_cputime structure. | |
bb34d92f FM |
204 | * |
205 | * If thread group time is being maintained, get the structure for the | |
206 | * running CPU and update the utime field there. | |
207 | */ | |
7086efe1 FM |
208 | static inline void account_group_user_time(struct task_struct *tsk, |
209 | cputime_t cputime) | |
bb34d92f | 210 | { |
48286d50 | 211 | struct thread_group_cputimer *cputimer = &tsk->signal->cputimer; |
bb34d92f | 212 | |
fa18f7bd | 213 | if (!cputimer_running(tsk)) |
4cd4c1b4 PZ |
214 | return; |
215 | ||
ee30a7b2 | 216 | raw_spin_lock(&cputimer->lock); |
64861634 | 217 | cputimer->cputime.utime += cputime; |
ee30a7b2 | 218 | raw_spin_unlock(&cputimer->lock); |
bb34d92f FM |
219 | } |
220 | ||
221 | /** | |
7086efe1 | 222 | * account_group_system_time - Maintain stime for a thread group. |
bb34d92f | 223 | * |
7086efe1 FM |
224 | * @tsk: Pointer to task structure. |
225 | * @cputime: Time value by which to increment the stime field of the | |
226 | * thread_group_cputime structure. | |
bb34d92f FM |
227 | * |
228 | * If thread group time is being maintained, get the structure for the | |
229 | * running CPU and update the stime field there. | |
230 | */ | |
7086efe1 FM |
231 | static inline void account_group_system_time(struct task_struct *tsk, |
232 | cputime_t cputime) | |
bb34d92f | 233 | { |
48286d50 | 234 | struct thread_group_cputimer *cputimer = &tsk->signal->cputimer; |
4cd4c1b4 | 235 | |
fa18f7bd | 236 | if (!cputimer_running(tsk)) |
4cd4c1b4 | 237 | return; |
bb34d92f | 238 | |
ee30a7b2 | 239 | raw_spin_lock(&cputimer->lock); |
64861634 | 240 | cputimer->cputime.stime += cputime; |
ee30a7b2 | 241 | raw_spin_unlock(&cputimer->lock); |
bb34d92f FM |
242 | } |
243 | ||
244 | /** | |
7086efe1 | 245 | * account_group_exec_runtime - Maintain exec runtime for a thread group. |
bb34d92f | 246 | * |
7086efe1 | 247 | * @tsk: Pointer to task structure. |
bb34d92f | 248 | * @ns: Time value by which to increment the sum_exec_runtime field |
7086efe1 | 249 | * of the thread_group_cputime structure. |
bb34d92f FM |
250 | * |
251 | * If thread group time is being maintained, get the structure for the | |
252 | * running CPU and update the sum_exec_runtime field there. | |
253 | */ | |
7086efe1 FM |
254 | static inline void account_group_exec_runtime(struct task_struct *tsk, |
255 | unsigned long long ns) | |
bb34d92f | 256 | { |
48286d50 | 257 | struct thread_group_cputimer *cputimer = &tsk->signal->cputimer; |
4cd4c1b4 | 258 | |
fa18f7bd | 259 | if (!cputimer_running(tsk)) |
4cd4c1b4 | 260 | return; |
bb34d92f | 261 | |
ee30a7b2 | 262 | raw_spin_lock(&cputimer->lock); |
4cd4c1b4 | 263 | cputimer->cputime.sum_exec_runtime += ns; |
ee30a7b2 | 264 | raw_spin_unlock(&cputimer->lock); |
bb34d92f | 265 | } |