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Diffstat (limited to 'include/linux/delayacct.h')
| -rw-r--r-- | include/linux/delayacct.h | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/include/linux/delayacct.h b/include/linux/delayacct.h new file mode 100644 index 000000000..0da97dba9 --- /dev/null +++ b/include/linux/delayacct.h @@ -0,0 +1,259 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* delayacct.h - per-task delay accounting + * + * Copyright (C) Shailabh Nagar, IBM Corp. 2006 + */ + +#ifndef _LINUX_DELAYACCT_H +#define _LINUX_DELAYACCT_H + +#include <uapi/linux/taskstats.h> + +#ifdef CONFIG_TASK_DELAY_ACCT +struct task_delay_info { + raw_spinlock_t lock; + + /* For each stat XXX, add following, aligned appropriately + * + * struct timespec XXX_start, XXX_end; + * u64 XXX_delay; + * u32 XXX_count; + * + * Atomicity of updates to XXX_delay, XXX_count protected by + * single lock above (split into XXX_lock if contention is an issue). + */ + + /* + * XXX_count is incremented on every XXX operation, the delay + * associated with the operation is added to XXX_delay. + * XXX_delay contains the accumulated delay time in nanoseconds. + */ + u64 blkio_start; + u64 blkio_delay; /* wait for sync block io completion */ + u64 swapin_start; + u64 swapin_delay; /* wait for swapin */ + u32 blkio_count; /* total count of the number of sync block */ + /* io operations performed */ + u32 swapin_count; /* total count of swapin */ + + u64 freepages_start; + u64 freepages_delay; /* wait for memory reclaim */ + + u64 thrashing_start; + u64 thrashing_delay; /* wait for thrashing page */ + + u64 compact_start; + u64 compact_delay; /* wait for memory compact */ + + u64 wpcopy_start; + u64 wpcopy_delay; /* wait for write-protect copy */ + + u32 freepages_count; /* total count of memory reclaim */ + u32 thrashing_count; /* total count of thrash waits */ + u32 compact_count; /* total count of memory compact */ + u32 wpcopy_count; /* total count of write-protect copy */ +}; +#endif + +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/jump_label.h> + +#ifdef CONFIG_TASK_DELAY_ACCT +DECLARE_STATIC_KEY_FALSE(delayacct_key); +extern int delayacct_on; /* Delay accounting turned on/off */ +extern struct kmem_cache *delayacct_cache; +extern void delayacct_init(void); + +extern void __delayacct_tsk_init(struct task_struct *); +extern void __delayacct_tsk_exit(struct task_struct *); +extern void __delayacct_blkio_start(void); +extern void __delayacct_blkio_end(struct task_struct *); +extern int delayacct_add_tsk(struct taskstats *, struct task_struct *); +extern __u64 __delayacct_blkio_ticks(struct task_struct *); +extern void __delayacct_freepages_start(void); +extern void __delayacct_freepages_end(void); +extern void __delayacct_thrashing_start(bool *in_thrashing); +extern void __delayacct_thrashing_end(bool *in_thrashing); +extern void __delayacct_swapin_start(void); +extern void __delayacct_swapin_end(void); +extern void __delayacct_compact_start(void); +extern void __delayacct_compact_end(void); +extern void __delayacct_wpcopy_start(void); +extern void __delayacct_wpcopy_end(void); + +static inline void delayacct_tsk_init(struct task_struct *tsk) +{ + /* reinitialize in case parent's non-null pointer was dup'ed*/ + tsk->delays = NULL; + if (delayacct_on) + __delayacct_tsk_init(tsk); +} + +/* Free tsk->delays. Called from bad fork and __put_task_struct + * where there's no risk of tsk->delays being accessed elsewhere + */ +static inline void delayacct_tsk_free(struct task_struct *tsk) +{ + if (tsk->delays) + kmem_cache_free(delayacct_cache, tsk->delays); + tsk->delays = NULL; +} + +static inline void delayacct_blkio_start(void) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (current->delays) + __delayacct_blkio_start(); +} + +static inline void delayacct_blkio_end(struct task_struct *p) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (p->delays) + __delayacct_blkio_end(p); +} + +static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) +{ + if (tsk->delays) + return __delayacct_blkio_ticks(tsk); + return 0; +} + +static inline void delayacct_freepages_start(void) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (current->delays) + __delayacct_freepages_start(); +} + +static inline void delayacct_freepages_end(void) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (current->delays) + __delayacct_freepages_end(); +} + +static inline void delayacct_thrashing_start(bool *in_thrashing) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (current->delays) + __delayacct_thrashing_start(in_thrashing); +} + +static inline void delayacct_thrashing_end(bool *in_thrashing) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (current->delays) + __delayacct_thrashing_end(in_thrashing); +} + +static inline void delayacct_swapin_start(void) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (current->delays) + __delayacct_swapin_start(); +} + +static inline void delayacct_swapin_end(void) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (current->delays) + __delayacct_swapin_end(); +} + +static inline void delayacct_compact_start(void) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (current->delays) + __delayacct_compact_start(); +} + +static inline void delayacct_compact_end(void) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (current->delays) + __delayacct_compact_end(); +} + +static inline void delayacct_wpcopy_start(void) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (current->delays) + __delayacct_wpcopy_start(); +} + +static inline void delayacct_wpcopy_end(void) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (current->delays) + __delayacct_wpcopy_end(); +} + +#else +static inline void delayacct_init(void) +{} +static inline void delayacct_tsk_init(struct task_struct *tsk) +{} +static inline void delayacct_tsk_free(struct task_struct *tsk) +{} +static inline void delayacct_blkio_start(void) +{} +static inline void delayacct_blkio_end(struct task_struct *p) +{} +static inline int delayacct_add_tsk(struct taskstats *d, + struct task_struct *tsk) +{ return 0; } +static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) +{ return 0; } +static inline int delayacct_is_task_waiting_on_io(struct task_struct *p) +{ return 0; } +static inline void delayacct_freepages_start(void) +{} +static inline void delayacct_freepages_end(void) +{} +static inline void delayacct_thrashing_start(bool *in_thrashing) +{} +static inline void delayacct_thrashing_end(bool *in_thrashing) +{} +static inline void delayacct_swapin_start(void) +{} +static inline void delayacct_swapin_end(void) +{} +static inline void delayacct_compact_start(void) +{} +static inline void delayacct_compact_end(void) +{} +static inline void delayacct_wpcopy_start(void) +{} +static inline void delayacct_wpcopy_end(void) +{} + +#endif /* CONFIG_TASK_DELAY_ACCT */ + +#endif |