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 */
29 #define DELAYACCT_PF_BLKIO 0x00000002 /* I am waiting on IO */
31 #ifdef CONFIG_TASK_DELAY_ACCT
33 extern int delayacct_on
; /* Delay accounting turned on/off */
34 extern struct kmem_cache
*delayacct_cache
;
35 extern void delayacct_init(void);
36 extern void __delayacct_tsk_init(struct task_struct
*);
37 extern void __delayacct_tsk_exit(struct task_struct
*);
38 extern void __delayacct_blkio_start(void);
39 extern void __delayacct_blkio_end(void);
40 extern int __delayacct_add_tsk(struct taskstats
*, struct task_struct
*);
41 extern __u64
__delayacct_blkio_ticks(struct task_struct
*);
42 extern void __delayacct_freepages_start(void);
43 extern void __delayacct_freepages_end(void);
45 static inline int delayacct_is_task_waiting_on_io(struct task_struct
*p
)
48 return (p
->delays
->flags
& DELAYACCT_PF_BLKIO
);
53 static inline void delayacct_set_flag(int flag
)
56 current
->delays
->flags
|= flag
;
59 static inline void delayacct_clear_flag(int flag
)
62 current
->delays
->flags
&= ~flag
;
65 static inline void delayacct_tsk_init(struct task_struct
*tsk
)
67 /* reinitialize in case parent's non-null pointer was dup'ed*/
70 __delayacct_tsk_init(tsk
);
73 /* Free tsk->delays. Called from bad fork and __put_task_struct
74 * where there's no risk of tsk->delays being accessed elsewhere
76 static inline void delayacct_tsk_free(struct task_struct
*tsk
)
79 kmem_cache_free(delayacct_cache
, tsk
->delays
);
83 static inline void delayacct_blkio_start(void)
85 delayacct_set_flag(DELAYACCT_PF_BLKIO
);
87 __delayacct_blkio_start();
90 static inline void delayacct_blkio_end(void)
93 __delayacct_blkio_end();
94 delayacct_clear_flag(DELAYACCT_PF_BLKIO
);
97 static inline int delayacct_add_tsk(struct taskstats
*d
,
98 struct task_struct
*tsk
)
100 if (!delayacct_on
|| !tsk
->delays
)
102 return __delayacct_add_tsk(d
, tsk
);
105 static inline __u64
delayacct_blkio_ticks(struct task_struct
*tsk
)
108 return __delayacct_blkio_ticks(tsk
);
112 static inline void delayacct_freepages_start(void)
115 __delayacct_freepages_start();
118 static inline void delayacct_freepages_end(void)
121 __delayacct_freepages_end();
125 static inline void delayacct_set_flag(int flag
)
127 static inline void delayacct_clear_flag(int flag
)
129 static inline void delayacct_init(void)
131 static inline void delayacct_tsk_init(struct task_struct
*tsk
)
133 static inline void delayacct_tsk_free(struct task_struct
*tsk
)
135 static inline void delayacct_blkio_start(void)
137 static inline void delayacct_blkio_end(void)
139 static inline int delayacct_add_tsk(struct taskstats
*d
,
140 struct task_struct
*tsk
)
142 static inline __u64
delayacct_blkio_ticks(struct task_struct
*tsk
)
144 static inline int delayacct_is_task_waiting_on_io(struct task_struct
*p
)
146 static inline void delayacct_freepages_start(void)
148 static inline void delayacct_freepages_end(void)
151 #endif /* CONFIG_TASK_DELAY_ACCT */
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