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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 | ||
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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 */ | |
28 | ||
ca74e92b SN |
29 | #ifdef CONFIG_TASK_DELAY_ACCT |
30 | ||
31 | extern int delayacct_on; /* Delay accounting turned on/off */ | |
32 | extern kmem_cache_t *delayacct_cache; | |
33 | extern void delayacct_init(void); | |
34 | extern void __delayacct_tsk_init(struct task_struct *); | |
35 | extern void __delayacct_tsk_exit(struct task_struct *); | |
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36 | extern void __delayacct_blkio_start(void); |
37 | extern void __delayacct_blkio_end(void); | |
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38 | |
39 | static inline void delayacct_set_flag(int flag) | |
40 | { | |
41 | if (current->delays) | |
42 | current->delays->flags |= flag; | |
43 | } | |
44 | ||
45 | static inline void delayacct_clear_flag(int flag) | |
46 | { | |
47 | if (current->delays) | |
48 | current->delays->flags &= ~flag; | |
49 | } | |
50 | ||
51 | static inline void delayacct_tsk_init(struct task_struct *tsk) | |
52 | { | |
53 | /* reinitialize in case parent's non-null pointer was dup'ed*/ | |
54 | tsk->delays = NULL; | |
55 | if (unlikely(delayacct_on)) | |
56 | __delayacct_tsk_init(tsk); | |
57 | } | |
58 | ||
59 | static inline void delayacct_tsk_exit(struct task_struct *tsk) | |
60 | { | |
61 | if (tsk->delays) | |
62 | __delayacct_tsk_exit(tsk); | |
63 | } | |
64 | ||
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65 | static inline void delayacct_blkio_start(void) |
66 | { | |
67 | if (current->delays) | |
68 | __delayacct_blkio_start(); | |
69 | } | |
70 | ||
71 | static inline void delayacct_blkio_end(void) | |
72 | { | |
73 | if (current->delays) | |
74 | __delayacct_blkio_end(); | |
75 | } | |
76 | ||
ca74e92b SN |
77 | #else |
78 | static inline void delayacct_set_flag(int flag) | |
79 | {} | |
80 | static inline void delayacct_clear_flag(int flag) | |
81 | {} | |
82 | static inline void delayacct_init(void) | |
83 | {} | |
84 | static inline void delayacct_tsk_init(struct task_struct *tsk) | |
85 | {} | |
86 | static inline void delayacct_tsk_exit(struct task_struct *tsk) | |
87 | {} | |
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88 | static inline void delayacct_blkio_start(void) |
89 | {} | |
90 | static inline void delayacct_blkio_end(void) | |
91 | {} | |
ca74e92b SN |
92 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
93 | ||
94 | #endif |