include/linux/taskstats_kern.h

   1 /* taskstats_kern.h - kernel header for per-task statistics interface
   2  *
   3  * Copyright (C) Shailabh Nagar, IBM Corp. 2006
   4  *           (C) Balbir Singh,   IBM Corp. 2006
   5  */
   6
   7 #ifndef _LINUX_TASKSTATS_KERN_H
   8 #define _LINUX_TASKSTATS_KERN_H
   9
  10 #include <linux/taskstats.h>
  11 #include <linux/sched.h>
  12 #include <net/genetlink.h>
  13
  14 #ifdef CONFIG_TASKSTATS
  15 extern kmem_cache_t *taskstats_cache;
  16 extern struct mutex taskstats_exit_mutex;
  17
  18 static inline void taskstats_exit_free(struct taskstats *tidstats)
  19 {
  20         if (tidstats)
  21                 kmem_cache_free(taskstats_cache, tidstats);
  22 }
  23
  24 static inline void taskstats_tgid_init(struct signal_struct *sig)
  25 {
  26         sig->stats = NULL;
  27 }
  28
  29 static inline void taskstats_tgid_alloc(struct task_struct *tsk)
  30 {
  31         struct signal_struct *sig = tsk->signal;
  32         struct taskstats *stats;
  33
  34         if (sig->stats != NULL)
  35                 return;
  36
  37         /* No problem if kmem_cache_zalloc() fails */
  38         stats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL);
  39
  40         spin_lock_irq(&tsk->sighand->siglock);
  41         if (!sig->stats) {
  42                 sig->stats = stats;
  43                 stats = NULL;
  44         }
  45         spin_unlock_irq(&tsk->sighand->siglock);
  46
  47         if (stats)
  48                 kmem_cache_free(taskstats_cache, stats);
  49 }
  50
  51 static inline void taskstats_tgid_free(struct signal_struct *sig)
  52 {
  53         if (sig->stats)
  54                 kmem_cache_free(taskstats_cache, sig->stats);
  55 }
  56
  57 extern void taskstats_exit_alloc(struct taskstats **, unsigned int *);
  58 extern void taskstats_exit_send(struct task_struct *, struct taskstats *, int, unsigned int);
  59 extern void taskstats_init_early(void);
  60 #else
  61 static inline void taskstats_exit_alloc(struct taskstats **ptidstats, unsigned int *mycpu)
  62 {}
  63 static inline void taskstats_exit_free(struct taskstats *ptidstats)
  64 {}
  65 static inline void taskstats_exit_send(struct task_struct *tsk,
  66                                        struct taskstats *tidstats,
  67                                        int group_dead, unsigned int cpu)
  68 {}
  69 static inline void taskstats_tgid_init(struct signal_struct *sig)
  70 {}
  71 static inline void taskstats_tgid_alloc(struct task_struct *tsk)
  72 {}
  73 static inline void taskstats_tgid_free(struct signal_struct *sig)
  74 {}
  75 static inline void taskstats_init_early(void)
  76 {}
  77 #endif /* CONFIG_TASKSTATS */
  78
  79 #endif
  80