include/linux/delayacct.h

   1 /* delayacct.h - per-task delay accounting
   2  *
   3  * Copyright (C) Shailabh Nagar, IBM Corp. 2006
   4  *
   5  * This program is free software;  you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  * the GNU General Public License for more details.
  14  *
  15  */
  16
  17 #ifndef _LINUX_DELAYACCT_H
  18 #define _LINUX_DELAYACCT_H
  19
  20 #include <linux/sched.h>
  21
  22 #ifdef CONFIG_TASK_DELAY_ACCT
  23
  24 extern int delayacct_on;        /* Delay accounting turned on/off */
  25 extern kmem_cache_t *delayacct_cache;
  26 extern void delayacct_init(void);
  27 extern void __delayacct_tsk_init(struct task_struct *);
  28 extern void __delayacct_tsk_exit(struct task_struct *);
  29
  30 static inline void delayacct_set_flag(int flag)
  31 {
  32         if (current->delays)
  33                 current->delays->flags |= flag;
  34 }
  35
  36 static inline void delayacct_clear_flag(int flag)
  37 {
  38         if (current->delays)
  39                 current->delays->flags &= ~flag;
  40 }
  41
  42 static inline void delayacct_tsk_init(struct task_struct *tsk)
  43 {
  44         /* reinitialize in case parent's non-null pointer was dup'ed*/
  45         tsk->delays = NULL;
  46         if (unlikely(delayacct_on))
  47                 __delayacct_tsk_init(tsk);
  48 }
  49
  50 static inline void delayacct_tsk_exit(struct task_struct *tsk)
  51 {
  52         if (tsk->delays)
  53                 __delayacct_tsk_exit(tsk);
  54 }
  55
  56 #else
  57 static inline void delayacct_set_flag(int flag)
  58 {}
  59 static inline void delayacct_clear_flag(int flag)
  60 {}
  61 static inline void delayacct_init(void)
  62 {}
  63 static inline void delayacct_tsk_init(struct task_struct *tsk)
  64 {}
  65 static inline void delayacct_tsk_exit(struct task_struct *tsk)
  66 {}
  67 #endif /* CONFIG_TASK_DELAY_ACCT */
  68
  69 #endif