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c942fddf | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
ca74e92b SN |
2 | /* delayacct.h - per-task delay accounting |
3 | * | |
4 | * Copyright (C) Shailabh Nagar, IBM Corp. 2006 | |
ca74e92b SN |
5 | */ |
6 | ||
7 | #ifndef _LINUX_DELAYACCT_H | |
8 | #define _LINUX_DELAYACCT_H | |
9 | ||
4025819d | 10 | #include <uapi/linux/taskstats.h> |
ca74e92b | 11 | |
0ff92245 SN |
12 | /* |
13 | * Per-task flags relevant to delay accounting | |
14 | * maintained privately to avoid exhausting similar flags in sched.h:PF_* | |
15 | * Used to set current->delays->flags | |
16 | */ | |
17 | #define DELAYACCT_PF_SWAPIN 0x00000001 /* I am doing a swapin */ | |
846c7bb0 | 18 | #define DELAYACCT_PF_BLKIO 0x00000002 /* I am waiting on IO */ |
0ff92245 | 19 | |
ca74e92b | 20 | #ifdef CONFIG_TASK_DELAY_ACCT |
47913d4e | 21 | struct task_delay_info { |
02acc80d | 22 | raw_spinlock_t lock; |
47913d4e | 23 | unsigned int flags; /* Private per-task flags */ |
ca74e92b | 24 | |
47913d4e IM |
25 | /* For each stat XXX, add following, aligned appropriately |
26 | * | |
27 | * struct timespec XXX_start, XXX_end; | |
28 | * u64 XXX_delay; | |
29 | * u32 XXX_count; | |
30 | * | |
31 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
32 | * single lock above (split into XXX_lock if contention is an issue). | |
33 | */ | |
34 | ||
35 | /* | |
36 | * XXX_count is incremented on every XXX operation, the delay | |
37 | * associated with the operation is added to XXX_delay. | |
38 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
39 | */ | |
40 | u64 blkio_start; /* Shared by blkio, swapin */ | |
41 | u64 blkio_delay; /* wait for sync block io completion */ | |
42 | u64 swapin_delay; /* wait for swapin block io completion */ | |
43 | u32 blkio_count; /* total count of the number of sync block */ | |
44 | /* io operations performed */ | |
45 | u32 swapin_count; /* total count of the number of swapin block */ | |
46 | /* io operations performed */ | |
47 | ||
48 | u64 freepages_start; | |
49 | u64 freepages_delay; /* wait for memory reclaim */ | |
b1d29ba8 JW |
50 | |
51 | u64 thrashing_start; | |
52 | u64 thrashing_delay; /* wait for thrashing page */ | |
53 | ||
47913d4e | 54 | u32 freepages_count; /* total count of memory reclaim */ |
b1d29ba8 | 55 | u32 thrashing_count; /* total count of thrash waits */ |
47913d4e IM |
56 | }; |
57 | #endif | |
58 | ||
59 | #include <linux/sched.h> | |
60 | #include <linux/slab.h> | |
61 | ||
62 | #ifdef CONFIG_TASK_DELAY_ACCT | |
ca74e92b | 63 | extern int delayacct_on; /* Delay accounting turned on/off */ |
e18b890b | 64 | extern struct kmem_cache *delayacct_cache; |
ca74e92b SN |
65 | extern void delayacct_init(void); |
66 | extern void __delayacct_tsk_init(struct task_struct *); | |
67 | extern void __delayacct_tsk_exit(struct task_struct *); | |
0ff92245 | 68 | extern void __delayacct_blkio_start(void); |
c96f5471 | 69 | extern void __delayacct_blkio_end(struct task_struct *); |
6f44993f | 70 | extern int __delayacct_add_tsk(struct taskstats *, struct task_struct *); |
25890454 | 71 | extern __u64 __delayacct_blkio_ticks(struct task_struct *); |
873b4771 KK |
72 | extern void __delayacct_freepages_start(void); |
73 | extern void __delayacct_freepages_end(void); | |
b1d29ba8 JW |
74 | extern void __delayacct_thrashing_start(void); |
75 | extern void __delayacct_thrashing_end(void); | |
ca74e92b | 76 | |
846c7bb0 BS |
77 | static inline int delayacct_is_task_waiting_on_io(struct task_struct *p) |
78 | { | |
79 | if (p->delays) | |
80 | return (p->delays->flags & DELAYACCT_PF_BLKIO); | |
81 | else | |
82 | return 0; | |
83 | } | |
84 | ||
ca74e92b SN |
85 | static inline void delayacct_set_flag(int flag) |
86 | { | |
87 | if (current->delays) | |
88 | current->delays->flags |= flag; | |
89 | } | |
90 | ||
91 | static inline void delayacct_clear_flag(int flag) | |
92 | { | |
93 | if (current->delays) | |
94 | current->delays->flags &= ~flag; | |
95 | } | |
96 | ||
97 | static inline void delayacct_tsk_init(struct task_struct *tsk) | |
98 | { | |
99 | /* reinitialize in case parent's non-null pointer was dup'ed*/ | |
100 | tsk->delays = NULL; | |
163ecdff | 101 | if (delayacct_on) |
ca74e92b SN |
102 | __delayacct_tsk_init(tsk); |
103 | } | |
104 | ||
35df17c5 SN |
105 | /* Free tsk->delays. Called from bad fork and __put_task_struct |
106 | * where there's no risk of tsk->delays being accessed elsewhere | |
107 | */ | |
108 | static inline void delayacct_tsk_free(struct task_struct *tsk) | |
ca74e92b SN |
109 | { |
110 | if (tsk->delays) | |
35df17c5 SN |
111 | kmem_cache_free(delayacct_cache, tsk->delays); |
112 | tsk->delays = NULL; | |
ca74e92b SN |
113 | } |
114 | ||
0ff92245 SN |
115 | static inline void delayacct_blkio_start(void) |
116 | { | |
846c7bb0 | 117 | delayacct_set_flag(DELAYACCT_PF_BLKIO); |
0ff92245 SN |
118 | if (current->delays) |
119 | __delayacct_blkio_start(); | |
120 | } | |
121 | ||
c96f5471 | 122 | static inline void delayacct_blkio_end(struct task_struct *p) |
0ff92245 | 123 | { |
b512719f | 124 | if (p->delays) |
c96f5471 | 125 | __delayacct_blkio_end(p); |
846c7bb0 | 126 | delayacct_clear_flag(DELAYACCT_PF_BLKIO); |
0ff92245 SN |
127 | } |
128 | ||
6f44993f SN |
129 | static inline int delayacct_add_tsk(struct taskstats *d, |
130 | struct task_struct *tsk) | |
131 | { | |
163ecdff | 132 | if (!delayacct_on || !tsk->delays) |
6f44993f SN |
133 | return 0; |
134 | return __delayacct_add_tsk(d, tsk); | |
135 | } | |
136 | ||
25890454 SN |
137 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
138 | { | |
139 | if (tsk->delays) | |
140 | return __delayacct_blkio_ticks(tsk); | |
141 | return 0; | |
142 | } | |
143 | ||
873b4771 KK |
144 | static inline void delayacct_freepages_start(void) |
145 | { | |
146 | if (current->delays) | |
147 | __delayacct_freepages_start(); | |
148 | } | |
149 | ||
150 | static inline void delayacct_freepages_end(void) | |
151 | { | |
152 | if (current->delays) | |
153 | __delayacct_freepages_end(); | |
154 | } | |
155 | ||
b1d29ba8 JW |
156 | static inline void delayacct_thrashing_start(void) |
157 | { | |
158 | if (current->delays) | |
159 | __delayacct_thrashing_start(); | |
160 | } | |
161 | ||
162 | static inline void delayacct_thrashing_end(void) | |
163 | { | |
164 | if (current->delays) | |
165 | __delayacct_thrashing_end(); | |
166 | } | |
167 | ||
ca74e92b SN |
168 | #else |
169 | static inline void delayacct_set_flag(int flag) | |
170 | {} | |
171 | static inline void delayacct_clear_flag(int flag) | |
172 | {} | |
173 | static inline void delayacct_init(void) | |
174 | {} | |
175 | static inline void delayacct_tsk_init(struct task_struct *tsk) | |
176 | {} | |
35df17c5 | 177 | static inline void delayacct_tsk_free(struct task_struct *tsk) |
ca74e92b | 178 | {} |
0ff92245 SN |
179 | static inline void delayacct_blkio_start(void) |
180 | {} | |
c96f5471 | 181 | static inline void delayacct_blkio_end(struct task_struct *p) |
0ff92245 | 182 | {} |
6f44993f SN |
183 | static inline int delayacct_add_tsk(struct taskstats *d, |
184 | struct task_struct *tsk) | |
185 | { return 0; } | |
25890454 SN |
186 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
187 | { return 0; } | |
846c7bb0 BS |
188 | static inline int delayacct_is_task_waiting_on_io(struct task_struct *p) |
189 | { return 0; } | |
873b4771 KK |
190 | static inline void delayacct_freepages_start(void) |
191 | {} | |
192 | static inline void delayacct_freepages_end(void) | |
193 | {} | |
b1d29ba8 JW |
194 | static inline void delayacct_thrashing_start(void) |
195 | {} | |
196 | static inline void delayacct_thrashing_end(void) | |
197 | {} | |
873b4771 | 198 | |
ca74e92b SN |
199 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
200 | ||
201 | #endif |