Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 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 | |
| 20 | #include <linux/sched.h> |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 21 | #include <linux/taskstats_kern.h> |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 22 | |
Shailabh Nagar | 0ff9224 | 2006-07-14 00:24:37 -0700 | [diff] [blame] | 23 | /* |
| 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 |
| 27 | */ |
| 28 | #define DELAYACCT_PF_SWAPIN 0x00000001 /* I am doing a swapin */ |
| 29 | |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 30 | #ifdef CONFIG_TASK_DELAY_ACCT |
| 31 | |
| 32 | extern int delayacct_on; /* Delay accounting turned on/off */ |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame^] | 33 | extern struct kmem_cache *delayacct_cache; |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 34 | extern void delayacct_init(void); |
| 35 | extern void __delayacct_tsk_init(struct task_struct *); |
| 36 | extern void __delayacct_tsk_exit(struct task_struct *); |
Shailabh Nagar | 0ff9224 | 2006-07-14 00:24:37 -0700 | [diff] [blame] | 37 | extern void __delayacct_blkio_start(void); |
| 38 | extern void __delayacct_blkio_end(void); |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 39 | extern int __delayacct_add_tsk(struct taskstats *, struct task_struct *); |
Shailabh Nagar | 2589045 | 2006-07-14 00:24:43 -0700 | [diff] [blame] | 40 | extern __u64 __delayacct_blkio_ticks(struct task_struct *); |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 41 | |
| 42 | static inline void delayacct_set_flag(int flag) |
| 43 | { |
| 44 | if (current->delays) |
| 45 | current->delays->flags |= flag; |
| 46 | } |
| 47 | |
| 48 | static inline void delayacct_clear_flag(int flag) |
| 49 | { |
| 50 | if (current->delays) |
| 51 | current->delays->flags &= ~flag; |
| 52 | } |
| 53 | |
| 54 | static inline void delayacct_tsk_init(struct task_struct *tsk) |
| 55 | { |
| 56 | /* reinitialize in case parent's non-null pointer was dup'ed*/ |
| 57 | tsk->delays = NULL; |
Shailabh Nagar | 163ecdf | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 58 | if (delayacct_on) |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 59 | __delayacct_tsk_init(tsk); |
| 60 | } |
| 61 | |
Shailabh Nagar | 35df17c | 2006-08-31 21:27:38 -0700 | [diff] [blame] | 62 | /* Free tsk->delays. Called from bad fork and __put_task_struct |
| 63 | * where there's no risk of tsk->delays being accessed elsewhere |
| 64 | */ |
| 65 | static inline void delayacct_tsk_free(struct task_struct *tsk) |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 66 | { |
| 67 | if (tsk->delays) |
Shailabh Nagar | 35df17c | 2006-08-31 21:27:38 -0700 | [diff] [blame] | 68 | kmem_cache_free(delayacct_cache, tsk->delays); |
| 69 | tsk->delays = NULL; |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 70 | } |
| 71 | |
Shailabh Nagar | 0ff9224 | 2006-07-14 00:24:37 -0700 | [diff] [blame] | 72 | static inline void delayacct_blkio_start(void) |
| 73 | { |
| 74 | if (current->delays) |
| 75 | __delayacct_blkio_start(); |
| 76 | } |
| 77 | |
| 78 | static inline void delayacct_blkio_end(void) |
| 79 | { |
| 80 | if (current->delays) |
| 81 | __delayacct_blkio_end(); |
| 82 | } |
| 83 | |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 84 | static inline int delayacct_add_tsk(struct taskstats *d, |
| 85 | struct task_struct *tsk) |
| 86 | { |
Shailabh Nagar | 163ecdf | 2006-07-30 03:03:11 -0700 | [diff] [blame] | 87 | if (!delayacct_on || !tsk->delays) |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 88 | return 0; |
| 89 | return __delayacct_add_tsk(d, tsk); |
| 90 | } |
| 91 | |
Shailabh Nagar | 2589045 | 2006-07-14 00:24:43 -0700 | [diff] [blame] | 92 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
| 93 | { |
| 94 | if (tsk->delays) |
| 95 | return __delayacct_blkio_ticks(tsk); |
| 96 | return 0; |
| 97 | } |
| 98 | |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 99 | #else |
| 100 | static inline void delayacct_set_flag(int flag) |
| 101 | {} |
| 102 | static inline void delayacct_clear_flag(int flag) |
| 103 | {} |
| 104 | static inline void delayacct_init(void) |
| 105 | {} |
| 106 | static inline void delayacct_tsk_init(struct task_struct *tsk) |
| 107 | {} |
Shailabh Nagar | 35df17c | 2006-08-31 21:27:38 -0700 | [diff] [blame] | 108 | static inline void delayacct_tsk_free(struct task_struct *tsk) |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 109 | {} |
Shailabh Nagar | 0ff9224 | 2006-07-14 00:24:37 -0700 | [diff] [blame] | 110 | static inline void delayacct_blkio_start(void) |
| 111 | {} |
| 112 | static inline void delayacct_blkio_end(void) |
| 113 | {} |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 114 | static inline int delayacct_add_tsk(struct taskstats *d, |
| 115 | struct task_struct *tsk) |
| 116 | { return 0; } |
Shailabh Nagar | 2589045 | 2006-07-14 00:24:43 -0700 | [diff] [blame] | 117 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
| 118 | { return 0; } |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 119 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
| 120 | |
| 121 | #endif |