Commit | Line | Data |
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029632fb | 1 | #include "sched.h" |
6fa3eb70 S |
2 | #ifdef CONFIG_HMP_TRACER |
3 | #include <trace/events/sched.h> | |
4 | #endif | |
029632fb | 5 | |
34f971f6 PZ |
6 | /* |
7 | * stop-task scheduling class. | |
8 | * | |
9 | * The stop task is the highest priority task in the system, it preempts | |
10 | * everything and will be preempted by nothing. | |
11 | * | |
12 | * See kernel/stop_machine.c | |
13 | */ | |
14 | ||
15 | #ifdef CONFIG_SMP | |
16 | static int | |
7608dec2 | 17 | select_task_rq_stop(struct task_struct *p, int sd_flag, int flags) |
34f971f6 PZ |
18 | { |
19 | return task_cpu(p); /* stop tasks as never migrate */ | |
20 | } | |
21 | #endif /* CONFIG_SMP */ | |
22 | ||
23 | static void | |
24 | check_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags) | |
25 | { | |
1e5a7405 | 26 | /* we're never preempted */ |
34f971f6 PZ |
27 | } |
28 | ||
29 | static struct task_struct *pick_next_task_stop(struct rq *rq) | |
30 | { | |
31 | struct task_struct *stop = rq->stop; | |
32 | ||
8f618968 MG |
33 | if (stop && stop->on_rq) { |
34 | stop->se.exec_start = rq->clock_task; | |
34f971f6 | 35 | return stop; |
8f618968 | 36 | } |
34f971f6 PZ |
37 | |
38 | return NULL; | |
39 | } | |
40 | ||
41 | static void | |
42 | enqueue_task_stop(struct rq *rq, struct task_struct *p, int flags) | |
43 | { | |
953bfcd1 | 44 | inc_nr_running(rq); |
6fa3eb70 S |
45 | #ifdef CONFIG_HMP_TRACER |
46 | trace_sched_runqueue_length(rq->cpu,rq->nr_running); | |
47 | #endif | |
48 | #ifdef CONFIG_MET_SCHED_HMP | |
49 | RqLen(smp_processor_id(),rq->nr_running); | |
50 | #endif | |
34f971f6 PZ |
51 | } |
52 | ||
53 | static void | |
54 | dequeue_task_stop(struct rq *rq, struct task_struct *p, int flags) | |
55 | { | |
953bfcd1 | 56 | dec_nr_running(rq); |
6fa3eb70 S |
57 | #ifdef CONFIG_HMP_TRACER |
58 | trace_sched_runqueue_length(rq->cpu,rq->nr_running); | |
59 | #endif | |
60 | #ifdef CONFIG_MET_SCHED_HMP | |
61 | RqLen(smp_processor_id(),rq->nr_running); | |
62 | #endif | |
34f971f6 PZ |
63 | } |
64 | ||
65 | static void yield_task_stop(struct rq *rq) | |
66 | { | |
67 | BUG(); /* the stop task should never yield, its pointless. */ | |
68 | } | |
69 | ||
70 | static void put_prev_task_stop(struct rq *rq, struct task_struct *prev) | |
71 | { | |
8f618968 MG |
72 | struct task_struct *curr = rq->curr; |
73 | u64 delta_exec; | |
74 | ||
75 | delta_exec = rq->clock_task - curr->se.exec_start; | |
76 | if (unlikely((s64)delta_exec < 0)) | |
77 | delta_exec = 0; | |
78 | ||
79 | schedstat_set(curr->se.statistics.exec_max, | |
80 | max(curr->se.statistics.exec_max, delta_exec)); | |
81 | ||
82 | curr->se.sum_exec_runtime += delta_exec; | |
83 | account_group_exec_runtime(curr, delta_exec); | |
84 | ||
85 | curr->se.exec_start = rq->clock_task; | |
86 | cpuacct_charge(curr, delta_exec); | |
34f971f6 PZ |
87 | } |
88 | ||
89 | static void task_tick_stop(struct rq *rq, struct task_struct *curr, int queued) | |
90 | { | |
91 | } | |
92 | ||
93 | static void set_curr_task_stop(struct rq *rq) | |
94 | { | |
8f618968 MG |
95 | struct task_struct *stop = rq->stop; |
96 | ||
97 | stop->se.exec_start = rq->clock_task; | |
34f971f6 PZ |
98 | } |
99 | ||
da7a735e | 100 | static void switched_to_stop(struct rq *rq, struct task_struct *p) |
34f971f6 PZ |
101 | { |
102 | BUG(); /* its impossible to change to this class */ | |
103 | } | |
104 | ||
da7a735e PZ |
105 | static void |
106 | prio_changed_stop(struct rq *rq, struct task_struct *p, int oldprio) | |
34f971f6 PZ |
107 | { |
108 | BUG(); /* how!?, what priority? */ | |
109 | } | |
110 | ||
111 | static unsigned int | |
112 | get_rr_interval_stop(struct rq *rq, struct task_struct *task) | |
113 | { | |
114 | return 0; | |
115 | } | |
116 | ||
117 | /* | |
118 | * Simple, special scheduling class for the per-CPU stop tasks: | |
119 | */ | |
029632fb | 120 | const struct sched_class stop_sched_class = { |
34f971f6 PZ |
121 | .next = &rt_sched_class, |
122 | ||
123 | .enqueue_task = enqueue_task_stop, | |
124 | .dequeue_task = dequeue_task_stop, | |
125 | .yield_task = yield_task_stop, | |
126 | ||
127 | .check_preempt_curr = check_preempt_curr_stop, | |
128 | ||
129 | .pick_next_task = pick_next_task_stop, | |
130 | .put_prev_task = put_prev_task_stop, | |
131 | ||
132 | #ifdef CONFIG_SMP | |
133 | .select_task_rq = select_task_rq_stop, | |
134 | #endif | |
135 | ||
136 | .set_curr_task = set_curr_task_stop, | |
137 | .task_tick = task_tick_stop, | |
138 | ||
139 | .get_rr_interval = get_rr_interval_stop, | |
140 | ||
141 | .prio_changed = prio_changed_stop, | |
142 | .switched_to = switched_to_stop, | |
34f971f6 | 143 | }; |