diff options
Diffstat (limited to 'include/linux/delayacct.h')
| -rw-r--r-- | include/linux/delayacct.h | 253 |
1 files changed, 194 insertions, 59 deletions
diff --git a/include/linux/delayacct.h b/include/linux/delayacct.h index 6cee17c22313..800dcc360db2 100644 --- a/include/linux/delayacct.h +++ b/include/linux/delayacct.h @@ -1,66 +1,104 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ /* delayacct.h - per-task delay accounting * * Copyright (C) Shailabh Nagar, IBM Corp. 2006 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See - * the GNU General Public License for more details. - * */ #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_max; + u64 blkio_delay_min; + u64 blkio_delay; /* wait for sync block io completion */ + u64 swapin_start; + u64 swapin_delay_max; + u64 swapin_delay_min; + 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_max; + u64 freepages_delay_min; + u64 freepages_delay; /* wait for memory reclaim */ + + u64 thrashing_start; + u64 thrashing_delay_max; + u64 thrashing_delay_min; + u64 thrashing_delay; /* wait for thrashing page */ + + u64 compact_start; + u64 compact_delay_max; + u64 compact_delay_min; + u64 compact_delay; /* wait for memory compact */ + + u64 wpcopy_start; + u64 wpcopy_delay_max; + u64 wpcopy_delay_min; + u64 wpcopy_delay; /* wait for write-protect copy */ + + u64 irq_delay_max; + u64 irq_delay_min; + u64 irq_delay; /* wait for IRQ/SOFTIRQ */ + + 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 */ + u32 irq_count; /* total count of IRQ/SOFTIRQ */ +}; +#endif + #include <linux/sched.h> #include <linux/slab.h> - -/* - * Per-task flags relevant to delay accounting - * maintained privately to avoid exhausting similar flags in sched.h:PF_* - * Used to set current->delays->flags - */ -#define DELAYACCT_PF_SWAPIN 0x00000001 /* I am doing a swapin */ -#define DELAYACCT_PF_BLKIO 0x00000002 /* I am waiting on IO */ +#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(void); -extern int __delayacct_add_tsk(struct taskstats *, struct task_struct *); +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); - -static inline int delayacct_is_task_waiting_on_io(struct task_struct *p) -{ - if (p->delays) - return (p->delays->flags & DELAYACCT_PF_BLKIO); - else - return 0; -} - -static inline void delayacct_set_flag(int flag) -{ - if (current->delays) - current->delays->flags |= flag; -} - -static inline void delayacct_clear_flag(int flag) -{ - if (current->delays) - current->delays->flags &= ~flag; -} +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); +extern void __delayacct_irq(struct task_struct *task, u32 delta); static inline void delayacct_tsk_init(struct task_struct *tsk) { @@ -82,24 +120,20 @@ static inline void delayacct_tsk_free(struct task_struct *tsk) static inline void delayacct_blkio_start(void) { - delayacct_set_flag(DELAYACCT_PF_BLKIO); + if (!static_branch_unlikely(&delayacct_key)) + return; + if (current->delays) __delayacct_blkio_start(); } -static inline void delayacct_blkio_end(void) +static inline void delayacct_blkio_end(struct task_struct *p) { - if (current->delays) - __delayacct_blkio_end(); - delayacct_clear_flag(DELAYACCT_PF_BLKIO); -} + if (!static_branch_unlikely(&delayacct_key)) + return; -static inline int delayacct_add_tsk(struct taskstats *d, - struct task_struct *tsk) -{ - if (!delayacct_on || !tsk->delays) - return 0; - return __delayacct_add_tsk(d, tsk); + if (p->delays) + __delayacct_blkio_end(p); } static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) @@ -111,21 +145,104 @@ static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk) 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(); +} + +static inline void delayacct_irq(struct task_struct *task, u32 delta) +{ + if (!static_branch_unlikely(&delayacct_key)) + return; + + if (task->delays) + __delayacct_irq(task, delta); +} + #else -static inline void delayacct_set_flag(int flag) -{} -static inline void delayacct_clear_flag(int flag) -{} static inline void delayacct_init(void) {} static inline void delayacct_tsk_init(struct task_struct *tsk) @@ -134,7 +251,7 @@ static inline void delayacct_tsk_free(struct task_struct *tsk) {} static inline void delayacct_blkio_start(void) {} -static inline void delayacct_blkio_end(void) +static inline void delayacct_blkio_end(struct task_struct *p) {} static inline int delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk) @@ -147,6 +264,24 @@ 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) +{} +static inline void delayacct_irq(struct task_struct *task, u32 delta) +{} #endif /* CONFIG_TASK_DELAY_ACCT */ |