/* 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 #include /* * 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 */ #ifdef CONFIG_TASK_DELAY_ACCT extern int delayacct_on; /* Delay accounting turned on/off */ extern kmem_cache_t *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 *); 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; } 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 (unlikely(delayacct_on)) __delayacct_tsk_init(tsk); } static inline void delayacct_tsk_exit(struct task_struct *tsk) { if (tsk->delays) __delayacct_tsk_exit(tsk); } static inline void delayacct_blkio_start(void) { if (current->delays) __delayacct_blkio_start(); } static inline void delayacct_blkio_end(void) { if (current->delays) __delayacct_blkio_end(); } static inline int delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk) { if (likely(!delayacct_on)) return -EINVAL; if (!tsk->delays) return 0; return __delayacct_add_tsk(d, tsk); } #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) {} static inline void delayacct_tsk_exit(struct task_struct *tsk) {} static inline void delayacct_blkio_start(void) {} static inline void delayacct_blkio_end(void) {} static inline int delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk) { return 0; } #endif /* CONFIG_TASK_DELAY_ACCT */ #endif