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 81