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 if (sig->stats) 53 kmem_cache_free(taskstats_cache, sig->stats); 54 } 55 56 extern void taskstats_exit_alloc(struct taskstats **, unsigned int *); 57 extern void taskstats_exit_send(struct task_struct *, struct taskstats *, int, unsigned int); 58 extern void taskstats_init_early(void); 59 extern void taskstats_tgid_alloc(struct signal_struct *); 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 signal_struct *sig) 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 81