taskstats_kern.h revision f9fd8914c1acca0d98b69d831b128d5b52f03c51 
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 kmem_cache_t *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	spin_lock_init(&sig->stats_lock);
27	sig->stats = NULL;
28}
29
30static 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
50static 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
65extern void taskstats_exit_alloc(struct taskstats **, unsigned int *);
66extern void taskstats_exit_send(struct task_struct *, struct taskstats *, int, unsigned int);
67extern void taskstats_init_early(void);
68extern void taskstats_tgid_alloc(struct signal_struct *);
69#else
70static inline void taskstats_exit_alloc(struct taskstats **ptidstats, unsigned int *mycpu)
71{}
72static inline void taskstats_exit_free(struct taskstats *ptidstats)
73{}
74static inline void taskstats_exit_send(struct task_struct *tsk,
75				       struct taskstats *tidstats,
76				       int group_dead, unsigned int cpu)
77{}
78static inline void taskstats_tgid_init(struct signal_struct *sig)
79{}
80static inline void taskstats_tgid_alloc(struct signal_struct *sig)
81{}
82static inline void taskstats_tgid_free(struct signal_struct *sig)
83{}
84static inline void taskstats_init_early(void)
85{}
86#endif /* CONFIG_TASKSTATS */
87
88#endif
89
90