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