/* taskstats_kern.h - kernel header for per-task statistics interface * * Copyright (C) Shailabh Nagar, IBM Corp. 2006 * (C) Balbir Singh, IBM Corp. 2006 */ #ifndef _LINUX_TASKSTATS_KERN_H #define _LINUX_TASKSTATS_KERN_H #include <linux/taskstats.h> #include <linux/sched.h> enum { TASKSTATS_MSG_UNICAST, /* send data only to requester */ TASKSTATS_MSG_MULTICAST, /* send data to a group */ }; #ifdef CONFIG_TASKSTATS extern kmem_cache_t *taskstats_cache; extern struct mutex taskstats_exit_mutex; static inline void taskstats_exit_alloc(struct taskstats **ptidstats) { *ptidstats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL); } static inline void taskstats_exit_free(struct taskstats *tidstats) { if (tidstats) kmem_cache_free(taskstats_cache, tidstats); } static inline void taskstats_tgid_init(struct signal_struct *sig) { spin_lock_init(&sig->stats_lock); sig->stats = NULL; } static inline void taskstats_tgid_alloc(struct signal_struct *sig) { struct taskstats *stats; unsigned long flags; stats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL); if (!stats) return; spin_lock_irqsave(&sig->stats_lock, flags); if (!sig->stats) { sig->stats = stats; stats = NULL; } spin_unlock_irqrestore(&sig->stats_lock, flags); if (stats) kmem_cache_free(taskstats_cache, stats); } static inline void taskstats_tgid_free(struct signal_struct *sig) { struct taskstats *stats = NULL; unsigned long flags; spin_lock_irqsave(&sig->stats_lock, flags); if (sig->stats) { stats = sig->stats; sig->stats = NULL; } spin_unlock_irqrestore(&sig->stats_lock, flags); if (stats) kmem_cache_free(taskstats_cache, stats); } extern void taskstats_exit_send(struct task_struct *, struct taskstats *, int); extern void taskstats_init_early(void); extern void taskstats_tgid_alloc(struct signal_struct *); #else static inline void taskstats_exit_alloc(struct taskstats **ptidstats) {} static inline void taskstats_exit_free(struct taskstats *ptidstats) {} static inline void taskstats_exit_send(struct task_struct *tsk, struct taskstats *tidstats, int group_dead) {} static inline void taskstats_tgid_init(struct signal_struct *sig) {} static inline void taskstats_tgid_alloc(struct signal_struct *sig) {} static inline void taskstats_tgid_free(struct signal_struct *sig) {} static inline void taskstats_init_early(void) {} #endif /* CONFIG_TASKSTATS */ #endif