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