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
taskstats_exit_free(struct taskstats * tidstats)18 static inline void taskstats_exit_free(struct taskstats *tidstats)
19 {
20 if (tidstats)
21 kmem_cache_free(taskstats_cache, tidstats);
22 }
23
taskstats_tgid_init(struct signal_struct * sig)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
taskstats_tgid_alloc(struct signal_struct * sig)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
taskstats_tgid_free(struct signal_struct * sig)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
taskstats_exit_alloc(struct taskstats ** ptidstats,unsigned int * mycpu)70 static inline void taskstats_exit_alloc(struct taskstats **ptidstats, unsigned int *mycpu)
71 {}
taskstats_exit_free(struct taskstats * ptidstats)72 static inline void taskstats_exit_free(struct taskstats *ptidstats)
73 {}
taskstats_exit_send(struct task_struct * tsk,struct taskstats * tidstats,int group_dead,unsigned int cpu)74 static inline void taskstats_exit_send(struct task_struct *tsk,
75 struct taskstats *tidstats,
76 int group_dead, unsigned int cpu)
77 {}
taskstats_tgid_init(struct signal_struct * sig)78 static inline void taskstats_tgid_init(struct signal_struct *sig)
79 {}
taskstats_tgid_alloc(struct signal_struct * sig)80 static inline void taskstats_tgid_alloc(struct signal_struct *sig)
81 {}
taskstats_tgid_free(struct signal_struct * sig)82 static inline void taskstats_tgid_free(struct signal_struct *sig)
83 {}
taskstats_init_early(void)84 static inline void taskstats_init_early(void)
85 {}
86 #endif /* CONFIG_TASKSTATS */
87
88 #endif
89
90