Root/
1 | /* delayacct.h - 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 will be useful, |
11 | * but 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 | |
17 | #ifndef _LINUX_DELAYACCT_H |
18 | #define _LINUX_DELAYACCT_H |
19 | |
20 | #include <linux/sched.h> |
21 | #include <linux/slab.h> |
22 | |
23 | /* |
24 | * Per-task flags relevant to delay accounting |
25 | * maintained privately to avoid exhausting similar flags in sched.h:PF_* |
26 | * Used to set current->delays->flags |
27 | */ |
28 | #define DELAYACCT_PF_SWAPIN 0x00000001 /* I am doing a swapin */ |
29 | #define DELAYACCT_PF_BLKIO 0x00000002 /* I am waiting on IO */ |
30 | |
31 | #ifdef CONFIG_TASK_DELAY_ACCT |
32 | |
33 | extern int delayacct_on; /* Delay accounting turned on/off */ |
34 | extern struct kmem_cache *delayacct_cache; |
35 | extern void delayacct_init(void); |
36 | extern void __delayacct_tsk_init(struct task_struct *); |
37 | extern void __delayacct_tsk_exit(struct task_struct *); |
38 | extern void __delayacct_blkio_start(void); |
39 | extern void __delayacct_blkio_end(void); |
40 | extern int __delayacct_add_tsk(struct taskstats *, struct task_struct *); |
41 | extern __u64 __delayacct_blkio_ticks(struct task_struct *); |
42 | extern void __delayacct_freepages_start(void); |
43 | extern void __delayacct_freepages_end(void); |
44 | |
45 | static inline int delayacct_is_task_waiting_on_io(struct task_struct *p) |
46 | { |
47 | if (p->delays) |
48 | return (p->delays->flags & DELAYACCT_PF_BLKIO); |
49 | else |
50 | return 0; |
51 | } |
52 | |
53 | static inline void delayacct_set_flag(int flag) |
54 | { |
55 | if (current->delays) |
56 | current->delays->flags |= flag; |
57 | } |
58 | |
59 | static inline void delayacct_clear_flag(int flag) |
60 | { |
61 | if (current->delays) |
62 | current->delays->flags &= ~flag; |
63 | } |
64 | |
65 | static inline void delayacct_tsk_init(struct task_struct *tsk) |
66 | { |
67 | /* reinitialize in case parent's non-null pointer was dup'ed*/ |
68 | tsk->delays = NULL; |
69 | if (delayacct_on) |
70 | __delayacct_tsk_init(tsk); |
71 | } |
72 | |
73 | /* Free tsk->delays. Called from bad fork and __put_task_struct |
74 | * where there's no risk of tsk->delays being accessed elsewhere |
75 | */ |
76 | static inline void delayacct_tsk_free(struct task_struct *tsk) |
77 | { |
78 | if (tsk->delays) |
79 | kmem_cache_free(delayacct_cache, tsk->delays); |
80 | tsk->delays = NULL; |
81 | } |
82 | |
83 | static inline void delayacct_blkio_start(void) |
84 | { |
85 | delayacct_set_flag(DELAYACCT_PF_BLKIO); |
86 | if (current->delays) |
87 | __delayacct_blkio_start(); |
88 | } |
89 | |
90 | static inline void delayacct_blkio_end(void) |
91 | { |
92 | if (current->delays) |
93 | __delayacct_blkio_end(); |
94 | delayacct_clear_flag(DELAYACCT_PF_BLKIO); |
95 | } |
96 | |
97 | static inline int delayacct_add_tsk(struct taskstats *d, |
98 | struct task_struct *tsk) |
99 | { |
100 | if (!delayacct_on || !tsk->delays) |
101 | return 0; |
102 | return __delayacct_add_tsk(d, tsk); |
103 | } |
104 | |
105 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
106 | { |
107 | if (tsk->delays) |
108 | return __delayacct_blkio_ticks(tsk); |
109 | return 0; |
110 | } |
111 | |
112 | static inline void delayacct_freepages_start(void) |
113 | { |
114 | if (current->delays) |
115 | __delayacct_freepages_start(); |
116 | } |
117 | |
118 | static inline void delayacct_freepages_end(void) |
119 | { |
120 | if (current->delays) |
121 | __delayacct_freepages_end(); |
122 | } |
123 | |
124 | #else |
125 | static inline void delayacct_set_flag(int flag) |
126 | {} |
127 | static inline void delayacct_clear_flag(int flag) |
128 | {} |
129 | static inline void delayacct_init(void) |
130 | {} |
131 | static inline void delayacct_tsk_init(struct task_struct *tsk) |
132 | {} |
133 | static inline void delayacct_tsk_free(struct task_struct *tsk) |
134 | {} |
135 | static inline void delayacct_blkio_start(void) |
136 | {} |
137 | static inline void delayacct_blkio_end(void) |
138 | {} |
139 | static inline int delayacct_add_tsk(struct taskstats *d, |
140 | struct task_struct *tsk) |
141 | { return 0; } |
142 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
143 | { return 0; } |
144 | static inline int delayacct_is_task_waiting_on_io(struct task_struct *p) |
145 | { return 0; } |
146 | static inline void delayacct_freepages_start(void) |
147 | {} |
148 | static inline void delayacct_freepages_end(void) |
149 | {} |
150 | |
151 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
152 | |
153 | #endif |
154 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9