taskstats_kern.h revision e18b890bb0881bbab6f4f1a6cd20d9c60d66b003 
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
15extern struct kmem_cache *taskstats_cache;
16extern struct mutex taskstats_exit_mutex;
17
18static inline void taskstats_exit_free(struct taskstats *tidstats)
19{
20	if (tidstats)
21		kmem_cache_free(taskstats_cache, tidstats);
22}
23
24static inline void taskstats_tgid_init(struct signal_struct *sig)
25{
26	sig->stats = NULL;
27}
28
29static 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, GFP_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
51static inline void taskstats_tgid_free(struct signal_struct *sig)
52{
53	if (sig->stats)
54		kmem_cache_free(taskstats_cache, sig->stats);
55}
56
57extern void taskstats_exit_alloc(struct taskstats **, unsigned int *);
58extern void taskstats_exit_send(struct task_struct *, struct taskstats *, int, unsigned int);
59extern void taskstats_init_early(void);
60#else
61static inline void taskstats_exit_alloc(struct taskstats **ptidstats, unsigned int *mycpu)
62{}
63static inline void taskstats_exit_free(struct taskstats *ptidstats)
64{}
65static inline void taskstats_exit_send(struct task_struct *tsk,
66				       struct taskstats *tidstats,
67				       int group_dead, unsigned int cpu)
68{}
69static inline void taskstats_tgid_init(struct signal_struct *sig)
70{}
71static inline void taskstats_tgid_alloc(struct task_struct *tsk)
72{}
73static inline void taskstats_tgid_free(struct signal_struct *sig)
74{}
75static inline void taskstats_init_early(void)
76{}
77#endif /* CONFIG_TASKSTATS */
78
79#endif
80
81