Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 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> |
Shailabh Nagar | c892436 | 2006-07-14 00:24:46 -0700 | [diff] [blame] | 12 | #include <net/genetlink.h> |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 13 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 14 | #ifdef CONFIG_TASKSTATS |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 15 | extern struct kmem_cache *taskstats_cache; |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 16 | extern struct mutex taskstats_exit_mutex; |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 17 | |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 18 | static inline void taskstats_tgid_init(struct signal_struct *sig) |
| 19 | { |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 20 | sig->stats = NULL; |
| 21 | } |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 22 | |
Oleg Nesterov | b8534d7 | 2006-10-28 10:38:53 -0700 | [diff] [blame] | 23 | static inline void taskstats_tgid_alloc(struct task_struct *tsk) |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 24 | { |
Oleg Nesterov | b8534d7 | 2006-10-28 10:38:53 -0700 | [diff] [blame] | 25 | struct signal_struct *sig = tsk->signal; |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 26 | struct taskstats *stats; |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 27 | |
Oleg Nesterov | 17b0269 | 2006-10-28 10:38:52 -0700 | [diff] [blame] | 28 | if (sig->stats != NULL) |
| 29 | return; |
| 30 | |
Oleg Nesterov | b8534d7 | 2006-10-28 10:38:53 -0700 | [diff] [blame] | 31 | /* No problem if kmem_cache_zalloc() fails */ |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 32 | stats = kmem_cache_zalloc(taskstats_cache, GFP_KERNEL); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 33 | |
Oleg Nesterov | b8534d7 | 2006-10-28 10:38:53 -0700 | [diff] [blame] | 34 | spin_lock_irq(&tsk->sighand->siglock); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 35 | if (!sig->stats) { |
| 36 | sig->stats = stats; |
| 37 | stats = NULL; |
| 38 | } |
Oleg Nesterov | b8534d7 | 2006-10-28 10:38:53 -0700 | [diff] [blame] | 39 | spin_unlock_irq(&tsk->sighand->siglock); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 40 | |
| 41 | if (stats) |
| 42 | kmem_cache_free(taskstats_cache, stats); |
| 43 | } |
| 44 | |
| 45 | static inline void taskstats_tgid_free(struct signal_struct *sig) |
| 46 | { |
Oleg Nesterov | 093a8e8 | 2006-10-28 10:38:51 -0700 | [diff] [blame] | 47 | if (sig->stats) |
| 48 | kmem_cache_free(taskstats_cache, sig->stats); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 49 | } |
| 50 | |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame^] | 51 | extern void taskstats_exit(struct task_struct *, int group_dead); |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 52 | extern void taskstats_init_early(void); |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 53 | #else |
Oleg Nesterov | 115085e | 2006-12-06 20:36:51 -0800 | [diff] [blame^] | 54 | static inline void taskstats_exit(struct task_struct *tsk, int group_dead) |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 55 | {} |
| 56 | static inline void taskstats_tgid_init(struct signal_struct *sig) |
| 57 | {} |
Oleg Nesterov | b8534d7 | 2006-10-28 10:38:53 -0700 | [diff] [blame] | 58 | static inline void taskstats_tgid_alloc(struct task_struct *tsk) |
Shailabh Nagar | ad4ecbc | 2006-07-14 00:24:44 -0700 | [diff] [blame] | 59 | {} |
| 60 | static inline void taskstats_tgid_free(struct signal_struct *sig) |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 61 | {} |
| 62 | static inline void taskstats_init_early(void) |
| 63 | {} |
| 64 | #endif /* CONFIG_TASKSTATS */ |
| 65 | |
| 66 | #endif |
| 67 | |