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 *);
41 static inline void delayacct_set_flag(int flag)
44 current->delays->flags |= flag;
47 static inline void delayacct_clear_flag(int flag)
50 current->delays->flags &= ~flag;
53 static inline void delayacct_tsk_init(struct task_struct *tsk)
55 /* reinitialize in case parent's non-null pointer was dup'ed*/
57 if (unlikely(delayacct_on))
58 __delayacct_tsk_init(tsk);
61 static inline void delayacct_tsk_exit(struct task_struct *tsk)
64 __delayacct_tsk_exit(tsk);
67 static inline void delayacct_blkio_start(void)
70 __delayacct_blkio_start();
73 static inline void delayacct_blkio_end(void)
76 __delayacct_blkio_end();
79 static inline int delayacct_add_tsk(struct taskstats *d,
80 struct task_struct *tsk)
82 if (likely(!delayacct_on))
86 return __delayacct_add_tsk(d, tsk);
90 static inline void delayacct_set_flag(int flag)
92 static inline void delayacct_clear_flag(int flag)
94 static inline void delayacct_init(void)
96 static inline void delayacct_tsk_init(struct task_struct *tsk)
98 static inline void delayacct_tsk_exit(struct task_struct *tsk)
100 static inline void delayacct_blkio_start(void)
102 static inline void delayacct_blkio_end(void)
104 static inline int delayacct_add_tsk(struct taskstats *d,
105 struct task_struct *tsk)
107 #endif /* CONFIG_TASK_DELAY_ACCT */