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Delay accounting does not track the delay of memory compact. When there is not enough free memory, tasks can spend a amount of their time waiting for compact. To get the impact of tasks in direct memory compact, measure the delay when allocating memory through memory compact. Also update tools/accounting/getdelays.c: / # ./getdelays_next -di -p 304 print delayacct stats ON printing IO accounting PID 304 CPU count real total virtual total delay total delay average 277 780000000 849039485 18877296 0.068ms IO count delay total delay average 0 0 0ms SWAP count delay total delay average 0 0 0ms RECLAIM count delay total delay average 5 11088812685 2217ms THRASHING count delay total delay average 0 0 0ms COMPACT count delay total delay average 3 72758 0ms watch: read=0, write=0, cancelled_write=0 Link: https://lkml.kernel.org/r/1638619795-71451-1-git-send-email-wang.yong12@zte.com.cn Signed-off-by: wangyong <wang.yong12@zte.com.cn> Reviewed-by: Jiang Xuexin <jiang.xuexin@zte.com.cn> Reviewed-by: Zhang Wenya <zhang.wenya1@zte.com.cn> Reviewed-by: Yang Yang <yang.yang29@zte.com.cn> Reviewed-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
234 lines
5.7 KiB
C
234 lines
5.7 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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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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};
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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 int sysctl_delayacct(struct ctl_table *table, int write, void *buffer,
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size_t *lenp, loff_t *ppos);
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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(void);
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extern void __delayacct_thrashing_end(void);
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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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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(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_thrashing_start();
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}
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static inline void delayacct_thrashing_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_thrashing_end();
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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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#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(void)
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{}
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static inline void delayacct_thrashing_end(void)
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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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#endif /* CONFIG_TASK_DELAY_ACCT */
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#endif
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