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 90