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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         raw_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 
 61         u64 thrashing_start;
 62         u64 thrashing_delay;    /* wait for thrashing page */
 63 
 64         u32 freepages_count;    /* total count of memory reclaim */
 65         u32 thrashing_count;    /* total count of thrash waits */
 66 };
 67 #endif
 68 
 69 #include <linux/sched.h>
 70 #include <linux/slab.h>
 71 
 72 #ifdef CONFIG_TASK_DELAY_ACCT
 73 extern int delayacct_on;        /* Delay accounting turned on/off */
 74 extern struct kmem_cache *delayacct_cache;
 75 extern void delayacct_init(void);
 76 extern void __delayacct_tsk_init(struct task_struct *);
 77 extern void __delayacct_tsk_exit(struct task_struct *);
 78 extern void __delayacct_blkio_start(void);
 79 extern void __delayacct_blkio_end(struct task_struct *);
 80 extern int __delayacct_add_tsk(struct taskstats *, struct task_struct *);
 81 extern __u64 __delayacct_blkio_ticks(struct task_struct *);
 82 extern void __delayacct_freepages_start(void);
 83 extern void __delayacct_freepages_end(void);
 84 extern void __delayacct_thrashing_start(void);
 85 extern void __delayacct_thrashing_end(void);
 86 
 87 static inline int delayacct_is_task_waiting_on_io(struct task_struct *p)
 88 {
 89         if (p->delays)
 90                 return (p->delays->flags & DELAYACCT_PF_BLKIO);
 91         else
 92                 return 0;
 93 }
 94 
 95 static inline void delayacct_set_flag(int flag)
 96 {
 97         if (current->delays)
 98                 current->delays->flags |= flag;
 99 }
100 
101 static inline void delayacct_clear_flag(int flag)
102 {
103         if (current->delays)
104                 current->delays->flags &= ~flag;
105 }
106 
107 static inline void delayacct_tsk_init(struct task_struct *tsk)
108 {
109         /* reinitialize in case parent's non-null pointer was dup'ed*/
110         tsk->delays = NULL;
111         if (delayacct_on)
112                 __delayacct_tsk_init(tsk);
113 }
114 
115 /* Free tsk->delays. Called from bad fork and __put_task_struct
116  * where there's no risk of tsk->delays being accessed elsewhere
117  */
118 static inline void delayacct_tsk_free(struct task_struct *tsk)
119 {
120         if (tsk->delays)
121                 kmem_cache_free(delayacct_cache, tsk->delays);
122         tsk->delays = NULL;
123 }
124 
125 static inline void delayacct_blkio_start(void)
126 {
127         delayacct_set_flag(DELAYACCT_PF_BLKIO);
128         if (current->delays)
129                 __delayacct_blkio_start();
130 }
131 
132 static inline void delayacct_blkio_end(struct task_struct *p)
133 {
134         if (p->delays)
135                 __delayacct_blkio_end(p);
136         delayacct_clear_flag(DELAYACCT_PF_BLKIO);
137 }
138 
139 static inline int delayacct_add_tsk(struct taskstats *d,
140                                         struct task_struct *tsk)
141 {
142         if (!delayacct_on || !tsk->delays)
143                 return 0;
144         return __delayacct_add_tsk(d, tsk);
145 }
146 
147 static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
148 {
149         if (tsk->delays)
150                 return __delayacct_blkio_ticks(tsk);
151         return 0;
152 }
153 
154 static inline void delayacct_freepages_start(void)
155 {
156         if (current->delays)
157                 __delayacct_freepages_start();
158 }
159 
160 static inline void delayacct_freepages_end(void)
161 {
162         if (current->delays)
163                 __delayacct_freepages_end();
164 }
165 
166 static inline void delayacct_thrashing_start(void)
167 {
168         if (current->delays)
169                 __delayacct_thrashing_start();
170 }
171 
172 static inline void delayacct_thrashing_end(void)
173 {
174         if (current->delays)
175                 __delayacct_thrashing_end();
176 }
177 
178 #else
179 static inline void delayacct_set_flag(int flag)
180 {}
181 static inline void delayacct_clear_flag(int flag)
182 {}
183 static inline void delayacct_init(void)
184 {}
185 static inline void delayacct_tsk_init(struct task_struct *tsk)
186 {}
187 static inline void delayacct_tsk_free(struct task_struct *tsk)
188 {}
189 static inline void delayacct_blkio_start(void)
190 {}
191 static inline void delayacct_blkio_end(struct task_struct *p)
192 {}
193 static inline int delayacct_add_tsk(struct taskstats *d,
194                                         struct task_struct *tsk)
195 { return 0; }
196 static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
197 { return 0; }
198 static inline int delayacct_is_task_waiting_on_io(struct task_struct *p)
199 { return 0; }
200 static inline void delayacct_freepages_start(void)
201 {}
202 static inline void delayacct_freepages_end(void)
203 {}
204 static inline void delayacct_thrashing_start(void)
205 {}
206 static inline void delayacct_thrashing_end(void)
207 {}
208 
209 #endif /* CONFIG_TASK_DELAY_ACCT */
210 
211 #endif
212 

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