1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* delayacct.h - per-task delay accounting
3 *
4 * Copyright (C) Shailabh Nagar, IBM Corp. 2006
5 */
6
7 #ifndef _LINUX_DELAYACCT_H
8 #define _LINUX_DELAYACCT_H
9
10 #include <uapi/linux/taskstats.h>
11
12 #ifdef CONFIG_TASK_DELAY_ACCT
13 struct task_delay_info {
14 raw_spinlock_t lock;
15
16 /* For each stat XXX, add following, aligned appropriately
17 *
18 * struct timespec XXX_start, XXX_end;
19 * u64 XXX_delay;
20 * u32 XXX_count;
21 *
22 * Atomicity of updates to XXX_delay, XXX_count protected by
23 * single lock above (split into XXX_lock if contention is an issue).
24 */
25
26 /*
27 * XXX_count is incremented on every XXX operation, the delay
28 * associated with the operation is added to XXX_delay.
29 * XXX_delay contains the accumulated delay time in nanoseconds.
30 */
31 u64 blkio_start;
32 u64 blkio_delay; /* wait for sync block io completion */
33 u64 swapin_start;
34 u64 swapin_delay; /* wait for swapin */
35 u32 blkio_count; /* total count of the number of sync block */
36 /* io operations performed */
37 u32 swapin_count; /* total count of swapin */
38
39 u64 freepages_start;
40 u64 freepages_delay; /* wait for memory reclaim */
41
42 u64 thrashing_start;
43 u64 thrashing_delay; /* wait for thrashing page */
44
45 u64 compact_start;
46 u64 compact_delay; /* wait for memory compact */
47
48 u64 wpcopy_start;
49 u64 wpcopy_delay; /* wait for write-protect copy */
50
51 u64 irq_delay; /* wait for IRQ/SOFTIRQ */
52
53 u32 freepages_count; /* total count of memory reclaim */
54 u32 thrashing_count; /* total count of thrash waits */
55 u32 compact_count; /* total count of memory compact */
56 u32 wpcopy_count; /* total count of write-protect copy */
57 u32 irq_count; /* total count of IRQ/SOFTIRQ */
58 };
59 #endif
60
61 #include <linux/sched.h>
62 #include <linux/slab.h>
63 #include <linux/jump_label.h>
64
65 #ifdef CONFIG_TASK_DELAY_ACCT
66 DECLARE_STATIC_KEY_FALSE(delayacct_key);
67 extern int delayacct_on; /* Delay accounting turned on/off */
68 extern struct kmem_cache *delayacct_cache;
69 extern void delayacct_init(void);
70
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 extern void __delayacct_thrashing_start(bool *in_thrashing);
80 extern void __delayacct_thrashing_end(bool *in_thrashing);
81 extern void __delayacct_swapin_start(void);
82 extern void __delayacct_swapin_end(void);
83 extern void __delayacct_compact_start(void);
84 extern void __delayacct_compact_end(void);
85 extern void __delayacct_wpcopy_start(void);
86 extern void __delayacct_wpcopy_end(void);
87 extern void __delayacct_irq(struct task_struct *task, u32 delta);
88
delayacct_tsk_init(struct task_struct * tsk)89 static inline void delayacct_tsk_init(struct task_struct *tsk)
90 {
91 /* reinitialize in case parent's non-null pointer was dup'ed*/
92 tsk->delays = NULL;
93 if (delayacct_on)
94 __delayacct_tsk_init(tsk);
95 }
96
97 /* Free tsk->delays. Called from bad fork and __put_task_struct
98 * where there's no risk of tsk->delays being accessed elsewhere
99 */
delayacct_tsk_free(struct task_struct * tsk)100 static inline void delayacct_tsk_free(struct task_struct *tsk)
101 {
102 if (tsk->delays)
103 kmem_cache_free(delayacct_cache, tsk->delays);
104 tsk->delays = NULL;
105 }
106
delayacct_blkio_start(void)107 static inline void delayacct_blkio_start(void)
108 {
109 if (!static_branch_unlikely(&delayacct_key))
110 return;
111
112 if (current->delays)
113 __delayacct_blkio_start();
114 }
115
delayacct_blkio_end(struct task_struct * p)116 static inline void delayacct_blkio_end(struct task_struct *p)
117 {
118 if (!static_branch_unlikely(&delayacct_key))
119 return;
120
121 if (p->delays)
122 __delayacct_blkio_end(p);
123 }
124
delayacct_blkio_ticks(struct task_struct * tsk)125 static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
126 {
127 if (tsk->delays)
128 return __delayacct_blkio_ticks(tsk);
129 return 0;
130 }
131
delayacct_freepages_start(void)132 static inline void delayacct_freepages_start(void)
133 {
134 if (!static_branch_unlikely(&delayacct_key))
135 return;
136
137 if (current->delays)
138 __delayacct_freepages_start();
139 }
140
delayacct_freepages_end(void)141 static inline void delayacct_freepages_end(void)
142 {
143 if (!static_branch_unlikely(&delayacct_key))
144 return;
145
146 if (current->delays)
147 __delayacct_freepages_end();
148 }
149
delayacct_thrashing_start(bool * in_thrashing)150 static inline void delayacct_thrashing_start(bool *in_thrashing)
151 {
152 if (!static_branch_unlikely(&delayacct_key))
153 return;
154
155 if (current->delays)
156 __delayacct_thrashing_start(in_thrashing);
157 }
158
delayacct_thrashing_end(bool * in_thrashing)159 static inline void delayacct_thrashing_end(bool *in_thrashing)
160 {
161 if (!static_branch_unlikely(&delayacct_key))
162 return;
163
164 if (current->delays)
165 __delayacct_thrashing_end(in_thrashing);
166 }
167
delayacct_swapin_start(void)168 static inline void delayacct_swapin_start(void)
169 {
170 if (!static_branch_unlikely(&delayacct_key))
171 return;
172
173 if (current->delays)
174 __delayacct_swapin_start();
175 }
176
delayacct_swapin_end(void)177 static inline void delayacct_swapin_end(void)
178 {
179 if (!static_branch_unlikely(&delayacct_key))
180 return;
181
182 if (current->delays)
183 __delayacct_swapin_end();
184 }
185
delayacct_compact_start(void)186 static inline void delayacct_compact_start(void)
187 {
188 if (!static_branch_unlikely(&delayacct_key))
189 return;
190
191 if (current->delays)
192 __delayacct_compact_start();
193 }
194
delayacct_compact_end(void)195 static inline void delayacct_compact_end(void)
196 {
197 if (!static_branch_unlikely(&delayacct_key))
198 return;
199
200 if (current->delays)
201 __delayacct_compact_end();
202 }
203
delayacct_wpcopy_start(void)204 static inline void delayacct_wpcopy_start(void)
205 {
206 if (!static_branch_unlikely(&delayacct_key))
207 return;
208
209 if (current->delays)
210 __delayacct_wpcopy_start();
211 }
212
delayacct_wpcopy_end(void)213 static inline void delayacct_wpcopy_end(void)
214 {
215 if (!static_branch_unlikely(&delayacct_key))
216 return;
217
218 if (current->delays)
219 __delayacct_wpcopy_end();
220 }
221
delayacct_irq(struct task_struct * task,u32 delta)222 static inline void delayacct_irq(struct task_struct *task, u32 delta)
223 {
224 if (!static_branch_unlikely(&delayacct_key))
225 return;
226
227 if (task->delays)
228 __delayacct_irq(task, delta);
229 }
230
231 #else
delayacct_init(void)232 static inline void delayacct_init(void)
233 {}
delayacct_tsk_init(struct task_struct * tsk)234 static inline void delayacct_tsk_init(struct task_struct *tsk)
235 {}
delayacct_tsk_free(struct task_struct * tsk)236 static inline void delayacct_tsk_free(struct task_struct *tsk)
237 {}
delayacct_blkio_start(void)238 static inline void delayacct_blkio_start(void)
239 {}
delayacct_blkio_end(struct task_struct * p)240 static inline void delayacct_blkio_end(struct task_struct *p)
241 {}
delayacct_add_tsk(struct taskstats * d,struct task_struct * tsk)242 static inline int delayacct_add_tsk(struct taskstats *d,
243 struct task_struct *tsk)
244 { return 0; }
delayacct_blkio_ticks(struct task_struct * tsk)245 static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
246 { return 0; }
delayacct_is_task_waiting_on_io(struct task_struct * p)247 static inline int delayacct_is_task_waiting_on_io(struct task_struct *p)
248 { return 0; }
delayacct_freepages_start(void)249 static inline void delayacct_freepages_start(void)
250 {}
delayacct_freepages_end(void)251 static inline void delayacct_freepages_end(void)
252 {}
delayacct_thrashing_start(bool * in_thrashing)253 static inline void delayacct_thrashing_start(bool *in_thrashing)
254 {}
delayacct_thrashing_end(bool * in_thrashing)255 static inline void delayacct_thrashing_end(bool *in_thrashing)
256 {}
delayacct_swapin_start(void)257 static inline void delayacct_swapin_start(void)
258 {}
delayacct_swapin_end(void)259 static inline void delayacct_swapin_end(void)
260 {}
delayacct_compact_start(void)261 static inline void delayacct_compact_start(void)
262 {}
delayacct_compact_end(void)263 static inline void delayacct_compact_end(void)
264 {}
delayacct_wpcopy_start(void)265 static inline void delayacct_wpcopy_start(void)
266 {}
delayacct_wpcopy_end(void)267 static inline void delayacct_wpcopy_end(void)
268 {}
delayacct_irq(struct task_struct * task,u32 delta)269 static inline void delayacct_irq(struct task_struct *task, u32 delta)
270 {}
271
272 #endif /* CONFIG_TASK_DELAY_ACCT */
273
274 #endif
275
