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16#include <linux/sched.h>
17#include <linux/slab.h>
18#include <linux/taskstats.h>
19#include <linux/time.h>
20#include <linux/sysctl.h>
21#include <linux/delayacct.h>
22#include <linux/module.h>
23
24int delayacct_on __read_mostly = 1;
25EXPORT_SYMBOL_GPL(delayacct_on);
26struct kmem_cache *delayacct_cache;
27
28static int __init delayacct_setup_disable(char *str)
29{
30 delayacct_on = 0;
31 return 1;
32}
33__setup("nodelayacct", delayacct_setup_disable);
34
35void delayacct_init(void)
36{
37 delayacct_cache = KMEM_CACHE(task_delay_info, SLAB_PANIC);
38 delayacct_tsk_init(&init_task);
39}
40
41void __delayacct_tsk_init(struct task_struct *tsk)
42{
43 tsk->delays = kmem_cache_zalloc(delayacct_cache, GFP_KERNEL);
44 if (tsk->delays)
45 spin_lock_init(&tsk->delays->lock);
46}
47
48
49
50
51
52
53static inline void delayacct_start(struct timespec *start)
54{
55 do_posix_clock_monotonic_gettime(start);
56}
57
58
59
60
61
62
63static void delayacct_end(struct timespec *start, struct timespec *end,
64 u64 *total, u32 *count)
65{
66 struct timespec ts;
67 s64 ns;
68 unsigned long flags;
69
70 do_posix_clock_monotonic_gettime(end);
71 ts = timespec_sub(*end, *start);
72 ns = timespec_to_ns(&ts);
73 if (ns < 0)
74 return;
75
76 spin_lock_irqsave(¤t->delays->lock, flags);
77 *total += ns;
78 (*count)++;
79 spin_unlock_irqrestore(¤t->delays->lock, flags);
80}
81
82void __delayacct_blkio_start(void)
83{
84 delayacct_start(¤t->delays->blkio_start);
85}
86
87void __delayacct_blkio_end(void)
88{
89 if (current->delays->flags & DELAYACCT_PF_SWAPIN)
90
91 delayacct_end(¤t->delays->blkio_start,
92 ¤t->delays->blkio_end,
93 ¤t->delays->swapin_delay,
94 ¤t->delays->swapin_count);
95 else
96 delayacct_end(¤t->delays->blkio_start,
97 ¤t->delays->blkio_end,
98 ¤t->delays->blkio_delay,
99 ¤t->delays->blkio_count);
100}
101
102int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
103{
104 s64 tmp;
105 unsigned long t1;
106 unsigned long long t2, t3;
107 unsigned long flags;
108 struct timespec ts;
109
110
111
112
113 if (!tsk->delays)
114 goto done;
115
116 tmp = (s64)d->cpu_run_real_total;
117 cputime_to_timespec(tsk->utime + tsk->stime, &ts);
118 tmp += timespec_to_ns(&ts);
119 d->cpu_run_real_total = (tmp < (s64)d->cpu_run_real_total) ? 0 : tmp;
120
121 tmp = (s64)d->cpu_scaled_run_real_total;
122 cputime_to_timespec(tsk->utimescaled + tsk->stimescaled, &ts);
123 tmp += timespec_to_ns(&ts);
124 d->cpu_scaled_run_real_total =
125 (tmp < (s64)d->cpu_scaled_run_real_total) ? 0 : tmp;
126
127
128
129
130
131 t1 = tsk->sched_info.pcount;
132 t2 = tsk->sched_info.run_delay;
133 t3 = tsk->se.sum_exec_runtime;
134
135 d->cpu_count += t1;
136
137 tmp = (s64)d->cpu_delay_total + t2;
138 d->cpu_delay_total = (tmp < (s64)d->cpu_delay_total) ? 0 : tmp;
139
140 tmp = (s64)d->cpu_run_virtual_total + t3;
141 d->cpu_run_virtual_total =
142 (tmp < (s64)d->cpu_run_virtual_total) ? 0 : tmp;
143
144
145
146 spin_lock_irqsave(&tsk->delays->lock, flags);
147 tmp = d->blkio_delay_total + tsk->delays->blkio_delay;
148 d->blkio_delay_total = (tmp < d->blkio_delay_total) ? 0 : tmp;
149 tmp = d->swapin_delay_total + tsk->delays->swapin_delay;
150 d->swapin_delay_total = (tmp < d->swapin_delay_total) ? 0 : tmp;
151 tmp = d->freepages_delay_total + tsk->delays->freepages_delay;
152 d->freepages_delay_total = (tmp < d->freepages_delay_total) ? 0 : tmp;
153 d->blkio_count += tsk->delays->blkio_count;
154 d->swapin_count += tsk->delays->swapin_count;
155 d->freepages_count += tsk->delays->freepages_count;
156 spin_unlock_irqrestore(&tsk->delays->lock, flags);
157
158done:
159 return 0;
160}
161
162__u64 __delayacct_blkio_ticks(struct task_struct *tsk)
163{
164 __u64 ret;
165 unsigned long flags;
166
167 spin_lock_irqsave(&tsk->delays->lock, flags);
168 ret = nsec_to_clock_t(tsk->delays->blkio_delay +
169 tsk->delays->swapin_delay);
170 spin_unlock_irqrestore(&tsk->delays->lock, flags);
171 return ret;
172}
173
174void __delayacct_freepages_start(void)
175{
176 delayacct_start(¤t->delays->freepages_start);
177}
178
179void __delayacct_freepages_end(void)
180{
181 delayacct_end(¤t->delays->freepages_start,
182 ¤t->delays->freepages_end,
183 ¤t->delays->freepages_delay,
184 ¤t->delays->freepages_count);
185}
186
187