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>
21 #include <linux/taskstats_kern.h>
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
28 #define DELAYACCT_PF_SWAPIN 0x00000001 /* I am doing a swapin */
30 #ifdef CONFIG_TASK_DELAY_ACCT
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 *);
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 *);
42 static inline void delayacct_set_flag(int flag)
45 current->delays->flags |= flag;
48 static inline void delayacct_clear_flag(int flag)
51 current->delays->flags &= ~flag;
54 static inline void delayacct_tsk_init(struct task_struct *tsk)
56 /* reinitialize in case parent's non-null pointer was dup'ed*/
59 __delayacct_tsk_init(tsk);
62 /* Free tsk->delays. Called from bad fork and __put_task_struct
63 * where there's no risk of tsk->delays being accessed elsewhere
65 static inline void delayacct_tsk_free(struct task_struct *tsk)
68 kmem_cache_free(delayacct_cache, tsk->delays);
72 static inline void delayacct_blkio_start(void)
75 __delayacct_blkio_start();
78 static inline void delayacct_blkio_end(void)
81 __delayacct_blkio_end();
84 static inline int delayacct_add_tsk(struct taskstats *d,
85 struct task_struct *tsk)
87 if (!delayacct_on || !tsk->delays)
89 return __delayacct_add_tsk(d, tsk);
92 static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
95 return __delayacct_blkio_ticks(tsk);
100 static inline void delayacct_set_flag(int flag)
102 static inline void delayacct_clear_flag(int flag)
104 static inline void delayacct_init(void)
106 static inline void delayacct_tsk_init(struct task_struct *tsk)
108 static inline void delayacct_tsk_free(struct task_struct *tsk)
110 static inline void delayacct_blkio_start(void)
112 static inline void delayacct_blkio_end(void)
114 static inline int delayacct_add_tsk(struct taskstats *d,
115 struct task_struct *tsk)
117 static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
119 #endif /* CONFIG_TASK_DELAY_ACCT */