Release 4.12 include/linux/delayacct.h

Directory: include/linux
/* 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>

/*
 * 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 */

#ifdef CONFIG_TASK_DELAY_ACCT

struct task_delay_info {
	
spinlock_t	lock;
	
unsigned int	flags;	/* Private per-task flags */

	/* 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;	/* Shared by blkio, swapin */
	
u64 blkio_delay;	/* wait for sync block io completion */
	
u64 swapin_delay;	/* wait for swapin block io completion */
	
u32 blkio_count;	/* total count of the number of sync block */
				/* io operations performed */
	
u32 swapin_count;	/* total count of the number of swapin block */
				/* io operations performed */

	
u64 freepages_start;
	
u64 freepages_delay;	/* wait for memory reclaim */
	
u32 freepages_count;	/* total count of memory reclaim */
};
#endif

#include <linux/sched.h>
#include <linux/slab.h>

#ifdef CONFIG_TASK_DELAY_ACCT
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 __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;
}

Contributors
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Balbir Singh 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%



static inline void delayacct_set_flag(int flag)
{
	if (current->delays)
		current->delays->flags |= flag;
}

Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static inline void delayacct_clear_flag(int flag)
{
	if (current->delays)
		current->delays->flags &= ~flag;
}

Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%

/* 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;
}

Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 33 100.00% 2 100.00%
Total 33 100.00% 2 100.00%



static inline void delayacct_blkio_start(void)
{
	delayacct_set_flag(DELAYACCT_PF_BLKIO);
	if (current->delays)
		__delayacct_blkio_start();
}

Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 18 78.26% 1 50.00%
Balbir Singh 5 21.74% 1 50.00%
Total 23 100.00% 2 100.00%



static inline void delayacct_blkio_end(void)
{
	if (current->delays)
		__delayacct_blkio_end();
	delayacct_clear_flag(DELAYACCT_PF_BLKIO);
}

Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 18 78.26% 1 50.00%
Balbir Singh 5 21.74% 1 50.00%
Total 23 100.00% 2 100.00%



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);
}

Contributors
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Shailabh Nagar 38 100.00% 2 100.00%
Total 38 100.00% 2 100.00%



static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
{
	if (tsk->delays)
		return __delayacct_blkio_ticks(tsk);
	return 0;
}

Contributors
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Shailabh Nagar 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%



static inline void delayacct_freepages_start(void)
{
	if (current->delays)
		__delayacct_freepages_start();
}

Contributors
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Keika Kobayashi 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%



static inline void delayacct_freepages_end(void)
{
	if (current->delays)
		__delayacct_freepages_end();
}

Contributors
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Keika Kobayashi 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%

#else


static inline void delayacct_set_flag(int flag)
{}
Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 9 100.00% 1 100.00%
Total 9 100.00% 1 100.00%



static inline void delayacct_clear_flag(int flag)
{}
Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 9 100.00% 1 100.00%
Total 9 100.00% 1 100.00%



static inline void delayacct_init(void)
{}
Contributors
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Shailabh Nagar 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%



static inline void delayacct_tsk_init(struct task_struct *tsk)
{}
Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 11 100.00% 1 100.00%
Total 11 100.00% 1 100.00%



static inline void delayacct_tsk_free(struct task_struct *tsk)
{}
Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 11 100.00% 2 100.00%
Total 11 100.00% 2 100.00%



static inline void delayacct_blkio_start(void)
{}
Contributors
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Shailabh Nagar 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%



static inline void delayacct_blkio_end(void)
{}
Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%



static inline int delayacct_add_tsk(struct taskstats *d,
					struct task_struct *tsk)
{ return 0; }
Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 20 100.00% 1 100.00%
Total 20 100.00% 1 100.00%



static inline __u64 delayacct_blkio_ticks(struct task_struct *tsk)
{ return 0; }
Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 15 100.00% 1 100.00%
Total 15 100.00% 1 100.00%



static inline int delayacct_is_task_waiting_on_io(struct task_struct *p)
{ return 0; }
Contributors
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Balbir Singh 15 100.00% 1 100.00%
Total 15 100.00% 1 100.00%



static inline void delayacct_freepages_start(void)
{}
Contributors
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Keika Kobayashi 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%



static inline void delayacct_freepages_end(void)
{}

Contributors
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Keika Kobayashi 8 100.00% 1 100.00%
Total 8 100.00% 1 100.00%

#endif /* CONFIG_TASK_DELAY_ACCT */

#endif
Overall Contributors
Person Tokens Prop Commits CommitProp
Shailabh Nagar 406 68.01% 6 54.55%
Keika Kobayashi 66 11.06% 1 9.09%
Balbir Singh 63 10.55% 1 9.09%
Ingo Molnar 60 10.05% 2 18.18%
Christoph Lameter 2 0.34% 1 9.09%
Total 597 100.00% 11 100.00%
Directory: include/linux

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Total	33	100.00%	1	100.00%
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Release 4.12 include/linux/delayacct.h

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