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ca74e92b SN |
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 | ||
0ff92245 SN |
22 | /* |
23 | * Per-task flags relevant to delay accounting | |
24 | * maintained privately to avoid exhausting similar flags in sched.h:PF_* | |
25 | * Used to set current->delays->flags | |
26 | */ | |
27 | #define DELAYACCT_PF_SWAPIN 0x00000001 /* I am doing a swapin */ | |
846c7bb0 | 28 | #define DELAYACCT_PF_BLKIO 0x00000002 /* I am waiting on IO */ |
0ff92245 | 29 | |
ca74e92b SN |
30 | #ifdef CONFIG_TASK_DELAY_ACCT |
31 | ||
32 | extern int delayacct_on; /* Delay accounting turned on/off */ | |
e18b890b | 33 | extern struct kmem_cache *delayacct_cache; |
ca74e92b SN |
34 | extern void delayacct_init(void); |
35 | extern void __delayacct_tsk_init(struct task_struct *); | |
36 | extern void __delayacct_tsk_exit(struct task_struct *); | |
0ff92245 SN |
37 | extern void __delayacct_blkio_start(void); |
38 | extern void __delayacct_blkio_end(void); | |
6f44993f | 39 | extern int __delayacct_add_tsk(struct taskstats *, struct task_struct *); |
25890454 | 40 | extern __u64 __delayacct_blkio_ticks(struct task_struct *); |
873b4771 KK |
41 | extern void __delayacct_freepages_start(void); |
42 | extern void __delayacct_freepages_end(void); | |
ca74e92b | 43 | |
846c7bb0 BS |
44 | static inline int delayacct_is_task_waiting_on_io(struct task_struct *p) |
45 | { | |
46 | if (p->delays) | |
47 | return (p->delays->flags & DELAYACCT_PF_BLKIO); | |
48 | else | |
49 | return 0; | |
50 | } | |
51 | ||
ca74e92b SN |
52 | static inline void delayacct_set_flag(int flag) |
53 | { | |
54 | if (current->delays) | |
55 | current->delays->flags |= flag; | |
56 | } | |
57 | ||
58 | static inline void delayacct_clear_flag(int flag) | |
59 | { | |
60 | if (current->delays) | |
61 | current->delays->flags &= ~flag; | |
62 | } | |
63 | ||
64 | static inline void delayacct_tsk_init(struct task_struct *tsk) | |
65 | { | |
66 | /* reinitialize in case parent's non-null pointer was dup'ed*/ | |
67 | tsk->delays = NULL; | |
163ecdff | 68 | if (delayacct_on) |
ca74e92b SN |
69 | __delayacct_tsk_init(tsk); |
70 | } | |
71 | ||
35df17c5 SN |
72 | /* Free tsk->delays. Called from bad fork and __put_task_struct |
73 | * where there's no risk of tsk->delays being accessed elsewhere | |
74 | */ | |
75 | static inline void delayacct_tsk_free(struct task_struct *tsk) | |
ca74e92b SN |
76 | { |
77 | if (tsk->delays) | |
35df17c5 SN |
78 | kmem_cache_free(delayacct_cache, tsk->delays); |
79 | tsk->delays = NULL; | |
ca74e92b SN |
80 | } |
81 | ||
0ff92245 SN |
82 | static inline void delayacct_blkio_start(void) |
83 | { | |
846c7bb0 | 84 | delayacct_set_flag(DELAYACCT_PF_BLKIO); |
0ff92245 SN |
85 | if (current->delays) |
86 | __delayacct_blkio_start(); | |
87 | } | |
88 | ||
89 | static inline void delayacct_blkio_end(void) | |
90 | { | |
91 | if (current->delays) | |
92 | __delayacct_blkio_end(); | |
846c7bb0 | 93 | delayacct_clear_flag(DELAYACCT_PF_BLKIO); |
0ff92245 SN |
94 | } |
95 | ||
6f44993f SN |
96 | static inline int delayacct_add_tsk(struct taskstats *d, |
97 | struct task_struct *tsk) | |
98 | { | |
163ecdff | 99 | if (!delayacct_on || !tsk->delays) |
6f44993f SN |
100 | return 0; |
101 | return __delayacct_add_tsk(d, tsk); | |
102 | } | |
103 | ||
25890454 SN |
104 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
105 | { | |
106 | if (tsk->delays) | |
107 | return __delayacct_blkio_ticks(tsk); | |
108 | return 0; | |
109 | } | |
110 | ||
873b4771 KK |
111 | static inline void delayacct_freepages_start(void) |
112 | { | |
113 | if (current->delays) | |
114 | __delayacct_freepages_start(); | |
115 | } | |
116 | ||
117 | static inline void delayacct_freepages_end(void) | |
118 | { | |
119 | if (current->delays) | |
120 | __delayacct_freepages_end(); | |
121 | } | |
122 | ||
ca74e92b SN |
123 | #else |
124 | static inline void delayacct_set_flag(int flag) | |
125 | {} | |
126 | static inline void delayacct_clear_flag(int flag) | |
127 | {} | |
128 | static inline void delayacct_init(void) | |
129 | {} | |
130 | static inline void delayacct_tsk_init(struct task_struct *tsk) | |
131 | {} | |
35df17c5 | 132 | static inline void delayacct_tsk_free(struct task_struct *tsk) |
ca74e92b | 133 | {} |
0ff92245 SN |
134 | static inline void delayacct_blkio_start(void) |
135 | {} | |
136 | static inline void delayacct_blkio_end(void) | |
137 | {} | |
6f44993f SN |
138 | static inline int delayacct_add_tsk(struct taskstats *d, |
139 | struct task_struct *tsk) | |
140 | { return 0; } | |
25890454 SN |
141 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
142 | { return 0; } | |
846c7bb0 BS |
143 | static inline int delayacct_is_task_waiting_on_io(struct task_struct *p) |
144 | { return 0; } | |
873b4771 KK |
145 | static inline void delayacct_freepages_start(void) |
146 | {} | |
147 | static inline void delayacct_freepages_end(void) | |
148 | {} | |
149 | ||
ca74e92b SN |
150 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
151 | ||
152 | #endif |