b8534d7bd8
signal_struct is (mostly) protected by ->sighand->siglock, I think we don't need ->taskstats_lock to protect ->stats. This also allows us to simplify the locking in fill_tgid(). Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Shailabh Nagar <nagar@watson.ibm.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Jay Lan <jlan@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
80 lines
2 KiB
C
80 lines
2 KiB
C
/* 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>
|
|
#include <net/genetlink.h>
|
|
|
|
#ifdef CONFIG_TASKSTATS
|
|
extern kmem_cache_t *taskstats_cache;
|
|
extern struct mutex taskstats_exit_mutex;
|
|
|
|
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)
|
|
{
|
|
sig->stats = NULL;
|
|
}
|
|
|
|
static inline void taskstats_tgid_alloc(struct task_struct *tsk)
|
|
{
|
|
struct signal_struct *sig = tsk->signal;
|
|
struct taskstats *stats;
|
|
|
|
if (sig->stats != NULL)
|
|
return;
|
|
|
|
/* No problem if kmem_cache_zalloc() fails */
|
|
stats = kmem_cache_zalloc(taskstats_cache, SLAB_KERNEL);
|
|
|
|
spin_lock_irq(&tsk->sighand->siglock);
|
|
if (!sig->stats) {
|
|
sig->stats = stats;
|
|
stats = NULL;
|
|
}
|
|
spin_unlock_irq(&tsk->sighand->siglock);
|
|
|
|
if (stats)
|
|
kmem_cache_free(taskstats_cache, stats);
|
|
}
|
|
|
|
static inline void taskstats_tgid_free(struct signal_struct *sig)
|
|
{
|
|
if (sig->stats)
|
|
kmem_cache_free(taskstats_cache, sig->stats);
|
|
}
|
|
|
|
extern void taskstats_exit_alloc(struct taskstats **, unsigned int *);
|
|
extern void taskstats_exit_send(struct task_struct *, struct taskstats *, int, unsigned int);
|
|
extern void taskstats_init_early(void);
|
|
#else
|
|
static inline void taskstats_exit_alloc(struct taskstats **ptidstats, unsigned int *mycpu)
|
|
{}
|
|
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, unsigned int cpu)
|
|
{}
|
|
static inline void taskstats_tgid_init(struct signal_struct *sig)
|
|
{}
|
|
static inline void taskstats_tgid_alloc(struct task_struct *tsk)
|
|
{}
|
|
static inline void taskstats_tgid_free(struct signal_struct *sig)
|
|
{}
|
|
static inline void taskstats_init_early(void)
|
|
{}
|
|
#endif /* CONFIG_TASKSTATS */
|
|
|
|
#endif
|
|
|