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 13 enum { 14 TASKSTATS_MSG_UNICAST, /* send data only to requester */ 15 TASKSTATS_MSG_MULTICAST, /* send data to a group */ 16 }; 17 18 #ifdef CONFIG_TASKSTATS 19 extern kmem_cache_t *taskstats_cache; 20 extern struct mutex taskstats_exit_mutex; 21 22 static inline void taskstats_exit_alloc(struct taskstats **ptidstats) 23 { 24 *ptidstats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL); 25 } 26 27 static inline void taskstats_exit_free(struct taskstats *tidstats) 28 { 29 if (tidstats) 30 kmem_cache_free(taskstats_cache, tidstats); 31 } 32 33 static inline void taskstats_tgid_init(struct signal_struct *sig) 34 { 35 spin_lock_init(&sig->stats_lock); 36 sig->stats = NULL; 37 } 38 39 static inline void taskstats_tgid_alloc(struct signal_struct *sig) 40 { 41 struct taskstats *stats; 42 unsigned long flags; 43 44 stats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL); 45 if (!stats) 46 return; 47 48 spin_lock_irqsave(&sig->stats_lock, flags); 49 if (!sig->stats) { 50 sig->stats = stats; 51 stats = NULL; 52 } 53 spin_unlock_irqrestore(&sig->stats_lock, flags); 54 55 if (stats) 56 kmem_cache_free(taskstats_cache, stats); 57 } 58 59 static inline void taskstats_tgid_free(struct signal_struct *sig) 60 { 61 struct taskstats *stats = NULL; 62 unsigned long flags; 63 64 spin_lock_irqsave(&sig->stats_lock, flags); 65 if (sig->stats) { 66 stats = sig->stats; 67 sig->stats = NULL; 68 } 69 spin_unlock_irqrestore(&sig->stats_lock, flags); 70 if (stats) 71 kmem_cache_free(taskstats_cache, stats); 72 } 73 74 extern void taskstats_exit_send(struct task_struct *, struct taskstats *, int); 75 extern void taskstats_init_early(void); 76 extern void taskstats_tgid_alloc(struct signal_struct *); 77 #else 78 static inline void taskstats_exit_alloc(struct taskstats **ptidstats) 79 {} 80 static inline void taskstats_exit_free(struct taskstats *ptidstats) 81 {} 82 static inline void taskstats_exit_send(struct task_struct *tsk, 83 struct taskstats *tidstats, 84 int group_dead) 85 {} 86 static inline void taskstats_tgid_init(struct signal_struct *sig) 87 {} 88 static inline void taskstats_tgid_alloc(struct signal_struct *sig) 89 {} 90 static inline void taskstats_tgid_free(struct signal_struct *sig) 91 {} 92 static inline void taskstats_init_early(void) 93 {} 94 #endif /* CONFIG_TASKSTATS */ 95 96 #endif 97 98