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Source at commit b386be689295730688885552666ea40b2e639b14 created 11 years 11 months ago. By Maarten ter Huurne, Revert "MIPS: JZ4740: reset: Initialize hibernate wakeup counters." | |
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1 | /* delayacct.c - per-task delay accounting |
2 | * |
3 | * Copyright (C) Shailabh Nagar, IBM Corp. 2006 |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it would be useful, but |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
13 | * the GNU General Public License for more details. |
14 | */ |
15 | |
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 | |
24 | int delayacct_on __read_mostly = 1; /* Delay accounting turned on/off */ |
25 | EXPORT_SYMBOL_GPL(delayacct_on); |
26 | struct kmem_cache *delayacct_cache; |
27 | |
28 | static int __init delayacct_setup_disable(char *str) |
29 | { |
30 | delayacct_on = 0; |
31 | return 1; |
32 | } |
33 | __setup("nodelayacct", delayacct_setup_disable); |
34 | |
35 | void delayacct_init(void) |
36 | { |
37 | delayacct_cache = KMEM_CACHE(task_delay_info, SLAB_PANIC); |
38 | delayacct_tsk_init(&init_task); |
39 | } |
40 | |
41 | void __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 | * Start accounting for a delay statistic using |
50 | * its starting timestamp (@start) |
51 | */ |
52 | |
53 | static inline void delayacct_start(struct timespec *start) |
54 | { |
55 | do_posix_clock_monotonic_gettime(start); |
56 | } |
57 | |
58 | /* |
59 | * Finish delay accounting for a statistic using |
60 | * its timestamps (@start, @end), accumalator (@total) and @count |
61 | */ |
62 | |
63 | static 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 | |
82 | void __delayacct_blkio_start(void) |
83 | { |
84 | delayacct_start(¤t->delays->blkio_start); |
85 | } |
86 | |
87 | void __delayacct_blkio_end(void) |
88 | { |
89 | if (current->delays->flags & DELAYACCT_PF_SWAPIN) |
90 | /* Swapin block I/O */ |
91 | delayacct_end(¤t->delays->blkio_start, |
92 | ¤t->delays->blkio_end, |
93 | ¤t->delays->swapin_delay, |
94 | ¤t->delays->swapin_count); |
95 | else /* Other block I/O */ |
96 | delayacct_end(¤t->delays->blkio_start, |
97 | ¤t->delays->blkio_end, |
98 | ¤t->delays->blkio_delay, |
99 | ¤t->delays->blkio_count); |
100 | } |
101 | |
102 | int __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 | /* Though tsk->delays accessed later, early exit avoids |
111 | * unnecessary returning of other data |
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 | * No locking available for sched_info (and too expensive to add one) |
129 | * Mitigate by taking snapshot of values |
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 | /* zero XXX_total, non-zero XXX_count implies XXX stat overflowed */ |
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 | |
158 | done: |
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 | |
174 | void __delayacct_freepages_start(void) |
175 | { |
176 | delayacct_start(¤t->delays->freepages_start); |
177 | } |
178 | |
179 | void __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 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9