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Based on 3 normalized pattern(s): 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 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 [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 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 [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
201 lines
5.3 KiB
C
201 lines
5.3 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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/*
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* Per-task flags relevant to delay accounting
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* maintained privately to avoid exhausting similar flags in sched.h:PF_*
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* Used to set current->delays->flags
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*/
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#define DELAYACCT_PF_SWAPIN 0x00000001 /* I am doing a swapin */
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#define DELAYACCT_PF_BLKIO 0x00000002 /* I am waiting on IO */
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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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unsigned int flags; /* Private per-task flags */
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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; /* Shared by blkio, swapin */
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u64 blkio_delay; /* wait for sync block io completion */
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u64 swapin_delay; /* wait for swapin block io completion */
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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 the number of swapin block */
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/* io operations performed */
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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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u32 freepages_count; /* total count of memory reclaim */
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u32 thrashing_count; /* total count of thrash waits */
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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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#ifdef CONFIG_TASK_DELAY_ACCT
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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(void);
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extern void __delayacct_thrashing_end(void);
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static inline int delayacct_is_task_waiting_on_io(struct task_struct *p)
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{
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if (p->delays)
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return (p->delays->flags & DELAYACCT_PF_BLKIO);
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else
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return 0;
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}
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static inline void delayacct_set_flag(int flag)
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{
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if (current->delays)
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current->delays->flags |= flag;
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}
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static inline void delayacct_clear_flag(int flag)
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{
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if (current->delays)
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current->delays->flags &= ~flag;
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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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/* 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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delayacct_set_flag(DELAYACCT_PF_BLKIO);
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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 (p->delays)
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__delayacct_blkio_end(p);
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delayacct_clear_flag(DELAYACCT_PF_BLKIO);
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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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{
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if (!delayacct_on || !tsk->delays)
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return 0;
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return __delayacct_add_tsk(d, tsk);
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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 (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 (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 (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 (current->delays)
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__delayacct_thrashing_end();
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}
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#else
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static inline void delayacct_set_flag(int flag)
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{}
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static inline void delayacct_clear_flag(int flag)
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{}
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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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#endif /* CONFIG_TASK_DELAY_ACCT */
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#endif
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