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         spin_lock_init(&sig->stats_lock);
  27         sig->stats = NULL;
  28 }
  29
  30 static inline void taskstats_tgid_alloc(struct signal_struct *sig)
  31 {
  32         struct taskstats *stats;
  33         unsigned long flags;
  34
  35         stats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL);
  36         if (!stats)
  37                 return;
  38
  39         spin_lock_irqsave(&sig->stats_lock, flags);
  40         if (!sig->stats) {
  41                 sig->stats = stats;
  42                 stats = NULL;
  43         }
  44         spin_unlock_irqrestore(&sig->stats_lock, flags);
  45
  46         if (stats)
  47                 kmem_cache_free(taskstats_cache, stats);
  48 }
  49
  50 static inline void taskstats_tgid_free(struct signal_struct *sig)
  51 {
  52         struct taskstats *stats = NULL;
  53         unsigned long flags;
  54
  55         spin_lock_irqsave(&sig->stats_lock, flags);
  56         if (sig->stats) {
  57                 stats = sig->stats;
  58                 sig->stats = NULL;
  59         }
  60         spin_unlock_irqrestore(&sig->stats_lock, flags);
  61         if (stats)
  62                 kmem_cache_free(taskstats_cache, stats);
  63 }
  64
  65 extern void taskstats_exit_alloc(struct taskstats **, unsigned int *);
  66 extern void taskstats_exit_send(struct task_struct *, struct taskstats *, int, unsigned int);
  67 extern void taskstats_init_early(void);
  68 extern void taskstats_tgid_alloc(struct signal_struct *);
  69 #else
  70 static inline void taskstats_exit_alloc(struct taskstats **ptidstats, unsigned int *mycpu)
  71 {}
  72 static inline void taskstats_exit_free(struct taskstats *ptidstats)
  73 {}
  74 static inline void taskstats_exit_send(struct task_struct *tsk,
  75                                        struct taskstats *tidstats,
  76                                        int group_dead, unsigned int cpu)
  77 {}
  78 static inline void taskstats_tgid_init(struct signal_struct *sig)
  79 {}
  80 static inline void taskstats_tgid_alloc(struct signal_struct *sig)
  81 {}
  82 static inline void taskstats_tgid_free(struct signal_struct *sig)
  83 {}
  84 static inline void taskstats_init_early(void)
  85 {}
  86 #endif /* CONFIG_TASKSTATS */
  87
  88 #endif
  89