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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> | |
6f44993f | 21 | #include <linux/taskstats_kern.h> |
ca74e92b | 22 | |
0ff92245 SN |
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 | ||
ca74e92b SN |
30 | #ifdef CONFIG_TASK_DELAY_ACCT |
31 | ||
32 | extern int delayacct_on; /* Delay accounting turned on/off */ | |
33 | extern kmem_cache_t *delayacct_cache; | |
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 *); |
ca74e92b SN |
41 | |
42 | static inline void delayacct_set_flag(int flag) | |
43 | { | |
44 | if (current->delays) | |
45 | current->delays->flags |= flag; | |
46 | } | |
47 | ||
48 | static inline void delayacct_clear_flag(int flag) | |
49 | { | |
50 | if (current->delays) | |
51 | current->delays->flags &= ~flag; | |
52 | } | |
53 | ||
54 | static inline void delayacct_tsk_init(struct task_struct *tsk) | |
55 | { | |
56 | /* reinitialize in case parent's non-null pointer was dup'ed*/ | |
57 | tsk->delays = NULL; | |
163ecdff | 58 | if (delayacct_on) |
ca74e92b SN |
59 | __delayacct_tsk_init(tsk); |
60 | } | |
61 | ||
35df17c5 SN |
62 | /* Free tsk->delays. Called from bad fork and __put_task_struct |
63 | * where there's no risk of tsk->delays being accessed elsewhere | |
64 | */ | |
65 | static inline void delayacct_tsk_free(struct task_struct *tsk) | |
ca74e92b SN |
66 | { |
67 | if (tsk->delays) | |
35df17c5 SN |
68 | kmem_cache_free(delayacct_cache, tsk->delays); |
69 | tsk->delays = NULL; | |
ca74e92b SN |
70 | } |
71 | ||
0ff92245 SN |
72 | static inline void delayacct_blkio_start(void) |
73 | { | |
74 | if (current->delays) | |
75 | __delayacct_blkio_start(); | |
76 | } | |
77 | ||
78 | static inline void delayacct_blkio_end(void) | |
79 | { | |
80 | if (current->delays) | |
81 | __delayacct_blkio_end(); | |
82 | } | |
83 | ||
6f44993f SN |
84 | static inline int delayacct_add_tsk(struct taskstats *d, |
85 | struct task_struct *tsk) | |
86 | { | |
163ecdff | 87 | if (!delayacct_on || !tsk->delays) |
6f44993f SN |
88 | return 0; |
89 | return __delayacct_add_tsk(d, tsk); | |
90 | } | |
91 | ||
25890454 SN |
92 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
93 | { | |
94 | if (tsk->delays) | |
95 | return __delayacct_blkio_ticks(tsk); | |
96 | return 0; | |
97 | } | |
98 | ||
ca74e92b SN |
99 | #else |
100 | static inline void delayacct_set_flag(int flag) | |
101 | {} | |
102 | static inline void delayacct_clear_flag(int flag) | |
103 | {} | |
104 | static inline void delayacct_init(void) | |
105 | {} | |
106 | static inline void delayacct_tsk_init(struct task_struct *tsk) | |
107 | {} | |
35df17c5 | 108 | static inline void delayacct_tsk_free(struct task_struct *tsk) |
ca74e92b | 109 | {} |
0ff92245 SN |
110 | static inline void delayacct_blkio_start(void) |
111 | {} | |
112 | static inline void delayacct_blkio_end(void) | |
113 | {} | |
6f44993f SN |
114 | static inline int delayacct_add_tsk(struct taskstats *d, |
115 | struct task_struct *tsk) | |
116 | { return 0; } | |
25890454 SN |
117 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
118 | { return 0; } | |
ca74e92b SN |
119 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
120 | ||
121 | #endif |