MINI2440: remove __initdata from some structs
[linux-2.6/mini2440.git] / include / linux / delayacct.h
blob5076fe0c8a96a0f55b9992a21ff6d11a50ca56d5
1 /* delayacct.h - per-task delay accounting
3 * Copyright (C) Shailabh Nagar, IBM Corp. 2006
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.
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.
17 #ifndef _LINUX_DELAYACCT_H
18 #define _LINUX_DELAYACCT_H
20 #include <linux/sched.h>
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
27 #define DELAYACCT_PF_SWAPIN 0x00000001 /* I am doing a swapin */
28 #define DELAYACCT_PF_BLKIO 0x00000002 /* I am waiting on IO */
30 #ifdef CONFIG_TASK_DELAY_ACCT
32 extern int delayacct_on; /* Delay accounting turned on/off */
33 extern struct kmem_cache *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 *);
37 extern void __delayacct_blkio_start(void);
38 extern void __delayacct_blkio_end(void);
39 extern int __delayacct_add_tsk(struct taskstats *, struct task_struct *);
40 extern __u64 __delayacct_blkio_ticks(struct task_struct *);
41 extern void __delayacct_freepages_start(void);
42 extern void __delayacct_freepages_end(void);
44 static inline int delayacct_is_task_waiting_on_io(struct task_struct *p)
46 if (p->delays)
47 return (p->delays->flags & DELAYACCT_PF_BLKIO);
48 else
49 return 0;
52 static inline void delayacct_set_flag(int flag)
54 if (current->delays)
55 current->delays->flags |= flag;
58 static inline void delayacct_clear_flag(int flag)
60 if (current->delays)
61 current->delays->flags &= ~flag;
64 static inline void delayacct_tsk_init(struct task_struct *tsk)
66 /* reinitialize in case parent's non-null pointer was dup'ed*/
67 tsk->delays = NULL;
68 if (delayacct_on)
69 __delayacct_tsk_init(tsk);
72 /* Free tsk->delays. Called from bad fork and __put_task_struct
73 * where there's no risk of tsk->delays being accessed elsewhere
75 static inline void delayacct_tsk_free(struct task_struct *tsk)
77 if (tsk->delays)
78 kmem_cache_free(delayacct_cache, tsk->delays);
79 tsk->delays = NULL;
82 static inline void delayacct_blkio_start(void)
84 delayacct_set_flag(DELAYACCT_PF_BLKIO);
85 if (current->delays)
86 __delayacct_blkio_start();
89 static inline void delayacct_blkio_end(void)
91 if (current->delays)
92 __delayacct_blkio_end();
93 delayacct_clear_flag(DELAYACCT_PF_BLKIO);
96 static inline int delayacct_add_tsk(struct taskstats *d,
97 struct task_struct *tsk)
99 if (!delayacct_on || !tsk->delays)
100 return 0;
101 return __delayacct_add_tsk(d, tsk);
104 static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
106 if (tsk->delays)
107 return __delayacct_blkio_ticks(tsk);
108 return 0;
111 static inline void delayacct_freepages_start(void)
113 if (current->delays)
114 __delayacct_freepages_start();
117 static inline void delayacct_freepages_end(void)
119 if (current->delays)
120 __delayacct_freepages_end();
123 #else
124 static inline void delayacct_set_flag(int flag)
126 static inline void delayacct_clear_flag(int flag)
128 static inline void delayacct_init(void)
130 static inline void delayacct_tsk_init(struct task_struct *tsk)
132 static inline void delayacct_tsk_free(struct task_struct *tsk)
134 static inline void delayacct_blkio_start(void)
136 static inline void delayacct_blkio_end(void)
138 static inline int delayacct_add_tsk(struct taskstats *d,
139 struct task_struct *tsk)
140 { return 0; }
141 static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
142 { return 0; }
143 static inline int delayacct_is_task_waiting_on_io(struct task_struct *p)
144 { return 0; }
145 static inline void delayacct_freepages_start(void)
147 static inline void delayacct_freepages_end(void)
150 #endif /* CONFIG_TASK_DELAY_ACCT */
152 #endif