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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 | ||
4025819d | 20 | #include <uapi/linux/taskstats.h> |
ca74e92b | 21 | #include <linux/sched.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
ca74e92b | 23 | |
0ff92245 SN |
24 | /* |
25 | * Per-task flags relevant to delay accounting | |
26 | * maintained privately to avoid exhausting similar flags in sched.h:PF_* | |
27 | * Used to set current->delays->flags | |
28 | */ | |
29 | #define DELAYACCT_PF_SWAPIN 0x00000001 /* I am doing a swapin */ | |
846c7bb0 | 30 | #define DELAYACCT_PF_BLKIO 0x00000002 /* I am waiting on IO */ |
0ff92245 | 31 | |
ca74e92b SN |
32 | #ifdef CONFIG_TASK_DELAY_ACCT |
33 | ||
34 | extern int delayacct_on; /* Delay accounting turned on/off */ | |
e18b890b | 35 | extern struct kmem_cache *delayacct_cache; |
ca74e92b SN |
36 | extern void delayacct_init(void); |
37 | extern void __delayacct_tsk_init(struct task_struct *); | |
38 | extern void __delayacct_tsk_exit(struct task_struct *); | |
0ff92245 SN |
39 | extern void __delayacct_blkio_start(void); |
40 | extern void __delayacct_blkio_end(void); | |
6f44993f | 41 | extern int __delayacct_add_tsk(struct taskstats *, struct task_struct *); |
25890454 | 42 | extern __u64 __delayacct_blkio_ticks(struct task_struct *); |
873b4771 KK |
43 | extern void __delayacct_freepages_start(void); |
44 | extern void __delayacct_freepages_end(void); | |
ca74e92b | 45 | |
846c7bb0 BS |
46 | static inline int delayacct_is_task_waiting_on_io(struct task_struct *p) |
47 | { | |
48 | if (p->delays) | |
49 | return (p->delays->flags & DELAYACCT_PF_BLKIO); | |
50 | else | |
51 | return 0; | |
52 | } | |
53 | ||
ca74e92b SN |
54 | static inline void delayacct_set_flag(int flag) |
55 | { | |
56 | if (current->delays) | |
57 | current->delays->flags |= flag; | |
58 | } | |
59 | ||
60 | static inline void delayacct_clear_flag(int flag) | |
61 | { | |
62 | if (current->delays) | |
63 | current->delays->flags &= ~flag; | |
64 | } | |
65 | ||
66 | static inline void delayacct_tsk_init(struct task_struct *tsk) | |
67 | { | |
68 | /* reinitialize in case parent's non-null pointer was dup'ed*/ | |
69 | tsk->delays = NULL; | |
163ecdff | 70 | if (delayacct_on) |
ca74e92b SN |
71 | __delayacct_tsk_init(tsk); |
72 | } | |
73 | ||
35df17c5 SN |
74 | /* Free tsk->delays. Called from bad fork and __put_task_struct |
75 | * where there's no risk of tsk->delays being accessed elsewhere | |
76 | */ | |
77 | static inline void delayacct_tsk_free(struct task_struct *tsk) | |
ca74e92b SN |
78 | { |
79 | if (tsk->delays) | |
35df17c5 SN |
80 | kmem_cache_free(delayacct_cache, tsk->delays); |
81 | tsk->delays = NULL; | |
ca74e92b SN |
82 | } |
83 | ||
0ff92245 SN |
84 | static inline void delayacct_blkio_start(void) |
85 | { | |
846c7bb0 | 86 | delayacct_set_flag(DELAYACCT_PF_BLKIO); |
0ff92245 SN |
87 | if (current->delays) |
88 | __delayacct_blkio_start(); | |
89 | } | |
90 | ||
91 | static inline void delayacct_blkio_end(void) | |
92 | { | |
93 | if (current->delays) | |
94 | __delayacct_blkio_end(); | |
846c7bb0 | 95 | delayacct_clear_flag(DELAYACCT_PF_BLKIO); |
0ff92245 SN |
96 | } |
97 | ||
6f44993f SN |
98 | static inline int delayacct_add_tsk(struct taskstats *d, |
99 | struct task_struct *tsk) | |
100 | { | |
163ecdff | 101 | if (!delayacct_on || !tsk->delays) |
6f44993f SN |
102 | return 0; |
103 | return __delayacct_add_tsk(d, tsk); | |
104 | } | |
105 | ||
25890454 SN |
106 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
107 | { | |
108 | if (tsk->delays) | |
109 | return __delayacct_blkio_ticks(tsk); | |
110 | return 0; | |
111 | } | |
112 | ||
873b4771 KK |
113 | static inline void delayacct_freepages_start(void) |
114 | { | |
115 | if (current->delays) | |
116 | __delayacct_freepages_start(); | |
117 | } | |
118 | ||
119 | static inline void delayacct_freepages_end(void) | |
120 | { | |
121 | if (current->delays) | |
122 | __delayacct_freepages_end(); | |
123 | } | |
124 | ||
ca74e92b SN |
125 | #else |
126 | static inline void delayacct_set_flag(int flag) | |
127 | {} | |
128 | static inline void delayacct_clear_flag(int flag) | |
129 | {} | |
130 | static inline void delayacct_init(void) | |
131 | {} | |
132 | static inline void delayacct_tsk_init(struct task_struct *tsk) | |
133 | {} | |
35df17c5 | 134 | static inline void delayacct_tsk_free(struct task_struct *tsk) |
ca74e92b | 135 | {} |
0ff92245 SN |
136 | static inline void delayacct_blkio_start(void) |
137 | {} | |
138 | static inline void delayacct_blkio_end(void) | |
139 | {} | |
6f44993f SN |
140 | static inline int delayacct_add_tsk(struct taskstats *d, |
141 | struct task_struct *tsk) | |
142 | { return 0; } | |
25890454 SN |
143 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
144 | { return 0; } | |
846c7bb0 BS |
145 | static inline int delayacct_is_task_waiting_on_io(struct task_struct *p) |
146 | { return 0; } | |
873b4771 KK |
147 | static inline void delayacct_freepages_start(void) |
148 | {} | |
149 | static inline void delayacct_freepages_end(void) | |
150 | {} | |
151 | ||
ca74e92b SN |
152 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
153 | ||
154 | #endif |