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TOMOYO Linux Cross Reference
Linux/include/linux/delayacct.h

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  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 <uapi/linux/taskstats.h>
 21 
 22 /*
 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
 26  */
 27 #define DELAYACCT_PF_SWAPIN     0x00000001      /* I am doing a swapin */
 28 #define DELAYACCT_PF_BLKIO      0x00000002      /* I am waiting on IO */
 29 
 30 #ifdef CONFIG_TASK_DELAY_ACCT
 31 struct task_delay_info {
 32         spinlock_t      lock;
 33         unsigned int    flags;  /* Private per-task flags */
 34 
 35         /* For each stat XXX, add following, aligned appropriately
 36          *
 37          * struct timespec XXX_start, XXX_end;
 38          * u64 XXX_delay;
 39          * u32 XXX_count;
 40          *
 41          * Atomicity of updates to XXX_delay, XXX_count protected by
 42          * single lock above (split into XXX_lock if contention is an issue).
 43          */
 44 
 45         /*
 46          * XXX_count is incremented on every XXX operation, the delay
 47          * associated with the operation is added to XXX_delay.
 48          * XXX_delay contains the accumulated delay time in nanoseconds.
 49          */
 50         u64 blkio_start;        /* Shared by blkio, swapin */
 51         u64 blkio_delay;        /* wait for sync block io completion */
 52         u64 swapin_delay;       /* wait for swapin block io completion */
 53         u32 blkio_count;        /* total count of the number of sync block */
 54                                 /* io operations performed */
 55         u32 swapin_count;       /* total count of the number of swapin block */
 56                                 /* io operations performed */
 57 
 58         u64 freepages_start;
 59         u64 freepages_delay;    /* wait for memory reclaim */
 60         u32 freepages_count;    /* total count of memory reclaim */
 61 };
 62 #endif
 63 
 64 #include <linux/sched.h>
 65 #include <linux/slab.h>
 66 
 67 #ifdef CONFIG_TASK_DELAY_ACCT
 68 extern int delayacct_on;        /* Delay accounting turned on/off */
 69 extern struct kmem_cache *delayacct_cache;
 70 extern void delayacct_init(void);
 71 extern void __delayacct_tsk_init(struct task_struct *);
 72 extern void __delayacct_tsk_exit(struct task_struct *);
 73 extern void __delayacct_blkio_start(void);
 74 extern void __delayacct_blkio_end(struct task_struct *);
 75 extern int __delayacct_add_tsk(struct taskstats *, struct task_struct *);
 76 extern __u64 __delayacct_blkio_ticks(struct task_struct *);
 77 extern void __delayacct_freepages_start(void);
 78 extern void __delayacct_freepages_end(void);
 79 
 80 static inline int delayacct_is_task_waiting_on_io(struct task_struct *p)
 81 {
 82         if (p->delays)
 83                 return (p->delays->flags & DELAYACCT_PF_BLKIO);
 84         else
 85                 return 0;
 86 }
 87 
 88 static inline void delayacct_set_flag(int flag)
 89 {
 90         if (current->delays)
 91                 current->delays->flags |= flag;
 92 }
 93 
 94 static inline void delayacct_clear_flag(int flag)
 95 {
 96         if (current->delays)
 97                 current->delays->flags &= ~flag;
 98 }
 99 
100 static inline void delayacct_tsk_init(struct task_struct *tsk)
101 {
102         /* reinitialize in case parent's non-null pointer was dup'ed*/
103         tsk->delays = NULL;
104         if (delayacct_on)
105                 __delayacct_tsk_init(tsk);
106 }
107 
108 /* Free tsk->delays. Called from bad fork and __put_task_struct
109  * where there's no risk of tsk->delays being accessed elsewhere
110  */
111 static inline void delayacct_tsk_free(struct task_struct *tsk)
112 {
113         if (tsk->delays)
114                 kmem_cache_free(delayacct_cache, tsk->delays);
115         tsk->delays = NULL;
116 }
117 
118 static inline void delayacct_blkio_start(void)
119 {
120         delayacct_set_flag(DELAYACCT_PF_BLKIO);
121         if (current->delays)
122                 __delayacct_blkio_start();
123 }
124 
125 static inline void delayacct_blkio_end(struct task_struct *p)
126 {
127         if (current->delays)
128                 __delayacct_blkio_end(p);
129         delayacct_clear_flag(DELAYACCT_PF_BLKIO);
130 }
131 
132 static inline int delayacct_add_tsk(struct taskstats *d,
133                                         struct task_struct *tsk)
134 {
135         if (!delayacct_on || !tsk->delays)
136                 return 0;
137         return __delayacct_add_tsk(d, tsk);
138 }
139 
140 static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
141 {
142         if (tsk->delays)
143                 return __delayacct_blkio_ticks(tsk);
144         return 0;
145 }
146 
147 static inline void delayacct_freepages_start(void)
148 {
149         if (current->delays)
150                 __delayacct_freepages_start();
151 }
152 
153 static inline void delayacct_freepages_end(void)
154 {
155         if (current->delays)
156                 __delayacct_freepages_end();
157 }
158 
159 #else
160 static inline void delayacct_set_flag(int flag)
161 {}
162 static inline void delayacct_clear_flag(int flag)
163 {}
164 static inline void delayacct_init(void)
165 {}
166 static inline void delayacct_tsk_init(struct task_struct *tsk)
167 {}
168 static inline void delayacct_tsk_free(struct task_struct *tsk)
169 {}
170 static inline void delayacct_blkio_start(void)
171 {}
172 static inline void delayacct_blkio_end(struct task_struct *p)
173 {}
174 static inline int delayacct_add_tsk(struct taskstats *d,
175                                         struct task_struct *tsk)
176 { return 0; }
177 static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
178 { return 0; }
179 static inline int delayacct_is_task_waiting_on_io(struct task_struct *p)
180 { return 0; }
181 static inline void delayacct_freepages_start(void)
182 {}
183 static inline void delayacct_freepages_end(void)
184 {}
185 
186 #endif /* CONFIG_TASK_DELAY_ACCT */
187 
188 #endif
189 

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