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153 lines
4.0 KiB
153 lines
4.0 KiB
/* 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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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
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* the GNU General Public License for more details. |
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* |
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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 <linux/sched.h> |
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#include <linux/slab.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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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(void); |
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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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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(void) |
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{ |
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if (current->delays) |
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__delayacct_blkio_end(); |
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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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#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(void) |
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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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#endif /* CONFIG_TASK_DELAY_ACCT */ |
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#endif
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