| 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 | u32 freepages_count; /* total count of memory reclaim */ |
| 49 | u32 thrashing_count; /* total count of thrash waits */ |
| 50 | u32 compact_count; /* total count of memory compact */ |
| 51 | }; |
| 52 | #endif |
| 53 | |
| 54 | #include <linux/sched.h> |
| 55 | #include <linux/slab.h> |
| 56 | #include <linux/jump_label.h> |
| 57 | |
| 58 | #ifdef CONFIG_TASK_DELAY_ACCT |
| 59 | DECLARE_STATIC_KEY_FALSE(delayacct_key); |
| 60 | extern int delayacct_on; /* Delay accounting turned on/off */ |
| 61 | extern struct kmem_cache *delayacct_cache; |
| 62 | extern void delayacct_init(void); |
| 63 | |
| 64 | extern int sysctl_delayacct(struct ctl_table *table, int write, void *buffer, |
| 65 | size_t *lenp, loff_t *ppos); |
| 66 | |
| 67 | extern void __delayacct_tsk_init(struct task_struct *); |
| 68 | extern void __delayacct_tsk_exit(struct task_struct *); |
| 69 | extern void __delayacct_blkio_start(void); |
| 70 | extern void __delayacct_blkio_end(struct task_struct *); |
| 71 | extern int delayacct_add_tsk(struct taskstats *, struct task_struct *); |
| 72 | extern __u64 __delayacct_blkio_ticks(struct task_struct *); |
| 73 | extern void __delayacct_freepages_start(void); |
| 74 | extern void __delayacct_freepages_end(void); |
| 75 | extern void __delayacct_thrashing_start(void); |
| 76 | extern void __delayacct_thrashing_end(void); |
| 77 | extern void __delayacct_swapin_start(void); |
| 78 | extern void __delayacct_swapin_end(void); |
| 79 | extern void __delayacct_compact_start(void); |
| 80 | extern void __delayacct_compact_end(void); |
| 81 | |
| 82 | static inline void delayacct_tsk_init(struct task_struct *tsk) |
| 83 | { |
| 84 | /* reinitialize in case parent's non-null pointer was dup'ed*/ |
| 85 | tsk->delays = NULL; |
| 86 | if (delayacct_on) |
| 87 | __delayacct_tsk_init(tsk); |
| 88 | } |
| 89 | |
| 90 | /* Free tsk->delays. Called from bad fork and __put_task_struct |
| 91 | * where there's no risk of tsk->delays being accessed elsewhere |
| 92 | */ |
| 93 | static inline void delayacct_tsk_free(struct task_struct *tsk) |
| 94 | { |
| 95 | if (tsk->delays) |
| 96 | kmem_cache_free(delayacct_cache, tsk->delays); |
| 97 | tsk->delays = NULL; |
| 98 | } |
| 99 | |
| 100 | static inline void delayacct_blkio_start(void) |
| 101 | { |
| 102 | if (!static_branch_unlikely(&delayacct_key)) |
| 103 | return; |
| 104 | |
| 105 | if (current->delays) |
| 106 | __delayacct_blkio_start(); |
| 107 | } |
| 108 | |
| 109 | static inline void delayacct_blkio_end(struct task_struct *p) |
| 110 | { |
| 111 | if (!static_branch_unlikely(&delayacct_key)) |
| 112 | return; |
| 113 | |
| 114 | if (p->delays) |
| 115 | __delayacct_blkio_end(p); |
| 116 | } |
| 117 | |
| 118 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
| 119 | { |
| 120 | if (tsk->delays) |
| 121 | return __delayacct_blkio_ticks(tsk); |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | static inline void delayacct_freepages_start(void) |
| 126 | { |
| 127 | if (!static_branch_unlikely(&delayacct_key)) |
| 128 | return; |
| 129 | |
| 130 | if (current->delays) |
| 131 | __delayacct_freepages_start(); |
| 132 | } |
| 133 | |
| 134 | static inline void delayacct_freepages_end(void) |
| 135 | { |
| 136 | if (!static_branch_unlikely(&delayacct_key)) |
| 137 | return; |
| 138 | |
| 139 | if (current->delays) |
| 140 | __delayacct_freepages_end(); |
| 141 | } |
| 142 | |
| 143 | static inline void delayacct_thrashing_start(void) |
| 144 | { |
| 145 | if (!static_branch_unlikely(&delayacct_key)) |
| 146 | return; |
| 147 | |
| 148 | if (current->delays) |
| 149 | __delayacct_thrashing_start(); |
| 150 | } |
| 151 | |
| 152 | static inline void delayacct_thrashing_end(void) |
| 153 | { |
| 154 | if (!static_branch_unlikely(&delayacct_key)) |
| 155 | return; |
| 156 | |
| 157 | if (current->delays) |
| 158 | __delayacct_thrashing_end(); |
| 159 | } |
| 160 | |
| 161 | static inline void delayacct_swapin_start(void) |
| 162 | { |
| 163 | if (!static_branch_unlikely(&delayacct_key)) |
| 164 | return; |
| 165 | |
| 166 | if (current->delays) |
| 167 | __delayacct_swapin_start(); |
| 168 | } |
| 169 | |
| 170 | static inline void delayacct_swapin_end(void) |
| 171 | { |
| 172 | if (!static_branch_unlikely(&delayacct_key)) |
| 173 | return; |
| 174 | |
| 175 | if (current->delays) |
| 176 | __delayacct_swapin_end(); |
| 177 | } |
| 178 | |
| 179 | static inline void delayacct_compact_start(void) |
| 180 | { |
| 181 | if (!static_branch_unlikely(&delayacct_key)) |
| 182 | return; |
| 183 | |
| 184 | if (current->delays) |
| 185 | __delayacct_compact_start(); |
| 186 | } |
| 187 | |
| 188 | static inline void delayacct_compact_end(void) |
| 189 | { |
| 190 | if (!static_branch_unlikely(&delayacct_key)) |
| 191 | return; |
| 192 | |
| 193 | if (current->delays) |
| 194 | __delayacct_compact_end(); |
| 195 | } |
| 196 | |
| 197 | #else |
| 198 | static inline void delayacct_init(void) |
| 199 | {} |
| 200 | static inline void delayacct_tsk_init(struct task_struct *tsk) |
| 201 | {} |
| 202 | static inline void delayacct_tsk_free(struct task_struct *tsk) |
| 203 | {} |
| 204 | static inline void delayacct_blkio_start(void) |
| 205 | {} |
| 206 | static inline void delayacct_blkio_end(struct task_struct *p) |
| 207 | {} |
| 208 | static inline int delayacct_add_tsk(struct taskstats *d, |
| 209 | struct task_struct *tsk) |
| 210 | { return 0; } |
| 211 | static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) |
| 212 | { return 0; } |
| 213 | static inline int delayacct_is_task_waiting_on_io(struct task_struct *p) |
| 214 | { return 0; } |
| 215 | static inline void delayacct_freepages_start(void) |
| 216 | {} |
| 217 | static inline void delayacct_freepages_end(void) |
| 218 | {} |
| 219 | static inline void delayacct_thrashing_start(void) |
| 220 | {} |
| 221 | static inline void delayacct_thrashing_end(void) |
| 222 | {} |
| 223 | static inline void delayacct_swapin_start(void) |
| 224 | {} |
| 225 | static inline void delayacct_swapin_end(void) |
| 226 | {} |
| 227 | static inline void delayacct_compact_start(void) |
| 228 | {} |
| 229 | static inline void delayacct_compact_end(void) |
| 230 | {} |
| 231 | |
| 232 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
| 233 | |
| 234 | #endif |