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16#include <linux/sched.h>
17#include <linux/sched/task.h>
18#include <linux/sched/cputime.h>
19#include <linux/slab.h>
20#include <linux/taskstats.h>
21#include <linux/time.h>
22#include <linux/sysctl.h>
23#include <linux/delayacct.h>
24#include <linux/module.h>
25
26int delayacct_on __read_mostly = 1;
27EXPORT_SYMBOL_GPL(delayacct_on);
28struct kmem_cache *delayacct_cache;
29
30static int __init delayacct_setup_disable(char *str)
31{
32 delayacct_on = 0;
33 return 1;
34}
35__setup("nodelayacct", delayacct_setup_disable);
36
37void delayacct_init(void)
38{
39 delayacct_cache = KMEM_CACHE(task_delay_info, SLAB_PANIC|SLAB_ACCOUNT);
40 delayacct_tsk_init(&init_task);
41}
42
43void __delayacct_tsk_init(struct task_struct *tsk)
44{
45 tsk->delays = kmem_cache_zalloc(delayacct_cache, GFP_KERNEL);
46 if (tsk->delays)
47 spin_lock_init(&tsk->delays->lock);
48}
49
50
51
52
53
54static void delayacct_end(u64 *start, u64 *total, u32 *count)
55{
56 s64 ns = ktime_get_ns() - *start;
57 unsigned long flags;
58
59 if (ns > 0) {
60 spin_lock_irqsave(¤t->delays->lock, flags);
61 *total += ns;
62 (*count)++;
63 spin_unlock_irqrestore(¤t->delays->lock, flags);
64 }
65}
66
67void __delayacct_blkio_start(void)
68{
69 current->delays->blkio_start = ktime_get_ns();
70}
71
72void __delayacct_blkio_end(void)
73{
74 if (current->delays->flags & DELAYACCT_PF_SWAPIN)
75
76 delayacct_end(¤t->delays->blkio_start,
77 ¤t->delays->swapin_delay,
78 ¤t->delays->swapin_count);
79 else
80 delayacct_end(¤t->delays->blkio_start,
81 ¤t->delays->blkio_delay,
82 ¤t->delays->blkio_count);
83}
84
85int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
86{
87 u64 utime, stime, stimescaled, utimescaled;
88 unsigned long long t2, t3;
89 unsigned long flags, t1;
90 s64 tmp;
91
92 task_cputime(tsk, &utime, &stime);
93 tmp = (s64)d->cpu_run_real_total;
94 tmp += utime + stime;
95 d->cpu_run_real_total = (tmp < (s64)d->cpu_run_real_total) ? 0 : tmp;
96
97 task_cputime_scaled(tsk, &utimescaled, &stimescaled);
98 tmp = (s64)d->cpu_scaled_run_real_total;
99 tmp += utimescaled + stimescaled;
100 d->cpu_scaled_run_real_total =
101 (tmp < (s64)d->cpu_scaled_run_real_total) ? 0 : tmp;
102
103
104
105
106
107 t1 = tsk->sched_info.pcount;
108 t2 = tsk->sched_info.run_delay;
109 t3 = tsk->se.sum_exec_runtime;
110
111 d->cpu_count += t1;
112
113 tmp = (s64)d->cpu_delay_total + t2;
114 d->cpu_delay_total = (tmp < (s64)d->cpu_delay_total) ? 0 : tmp;
115
116 tmp = (s64)d->cpu_run_virtual_total + t3;
117 d->cpu_run_virtual_total =
118 (tmp < (s64)d->cpu_run_virtual_total) ? 0 : tmp;
119
120
121
122 spin_lock_irqsave(&tsk->delays->lock, flags);
123 tmp = d->blkio_delay_total + tsk->delays->blkio_delay;
124 d->blkio_delay_total = (tmp < d->blkio_delay_total) ? 0 : tmp;
125 tmp = d->swapin_delay_total + tsk->delays->swapin_delay;
126 d->swapin_delay_total = (tmp < d->swapin_delay_total) ? 0 : tmp;
127 tmp = d->freepages_delay_total + tsk->delays->freepages_delay;
128 d->freepages_delay_total = (tmp < d->freepages_delay_total) ? 0 : tmp;
129 d->blkio_count += tsk->delays->blkio_count;
130 d->swapin_count += tsk->delays->swapin_count;
131 d->freepages_count += tsk->delays->freepages_count;
132 spin_unlock_irqrestore(&tsk->delays->lock, flags);
133
134 return 0;
135}
136
137__u64 __delayacct_blkio_ticks(struct task_struct *tsk)
138{
139 __u64 ret;
140 unsigned long flags;
141
142 spin_lock_irqsave(&tsk->delays->lock, flags);
143 ret = nsec_to_clock_t(tsk->delays->blkio_delay +
144 tsk->delays->swapin_delay);
145 spin_unlock_irqrestore(&tsk->delays->lock, flags);
146 return ret;
147}
148
149void __delayacct_freepages_start(void)
150{
151 current->delays->freepages_start = ktime_get_ns();
152}
153
154void __delayacct_freepages_end(void)
155{
156 delayacct_end(¤t->delays->freepages_start,
157 ¤t->delays->freepages_delay,
158 ¤t->delays->freepages_count);
159}
160
161