Messages in this thread Patch in this message | | | Date | Thu, 20 Dec 2007 13:12:02 +0000 | From | "Jan Beulich" <> | Subject | [PATCH 1/4] add task handling notifier: base definitions |
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This is the base patch, adding notification for task creation and deletion.
Signed-off-by: Jan Beulich <jbeulich@novell.com> --- include/linux/sched.h | 8 +++++++- kernel/fork.c | 11 +++++++++++ 2 files changed, 18 insertions(+), 1 deletion(-)
--- 2.6.24-rc5-notify-task.orig/include/linux/sched.h +++ 2.6.24-rc5-notify-task/include/linux/sched.h @@ -80,7 +80,7 @@ struct sched_param { #include <linux/rcupdate.h> #include <linux/futex.h> #include <linux/rtmutex.h> - +#include <linux/notifier.h> #include <linux/time.h> #include <linux/param.h> #include <linux/resource.h> @@ -1700,6 +1700,12 @@ extern int do_execve(char *, char __user extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); struct task_struct *fork_idle(int); +#define TASK_NEW 1 +#define TASK_DELETE 2 + +extern struct blocking_notifier_head task_notifier_list; +extern struct atomic_notifier_head atomic_task_notifier_list; + extern void set_task_comm(struct task_struct *tsk, char *from); extern void get_task_comm(char *to, struct task_struct *tsk); --- 2.6.24-rc5-notify-task.orig/kernel/fork.c +++ 2.6.24-rc5-notify-task/kernel/fork.c @@ -46,6 +46,7 @@ #include <linux/tsacct_kern.h> #include <linux/cn_proc.h> #include <linux/freezer.h> +#include <linux/notifier.h> #include <linux/delayacct.h> #include <linux/taskstats_kern.h> #include <linux/random.h> @@ -71,6 +72,11 @@ DEFINE_PER_CPU(unsigned long, process_co __cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */ +BLOCKING_NOTIFIER_HEAD(task_notifier_list); +EXPORT_SYMBOL_GPL(task_notifier_list); +ATOMIC_NOTIFIER_HEAD(atomic_task_notifier_list); +EXPORT_SYMBOL_GPL(atomic_task_notifier_list); + int nr_processes(void) { int cpu; @@ -121,6 +127,9 @@ void __put_task_struct(struct task_struc WARN_ON(atomic_read(&tsk->usage)); WARN_ON(tsk == current); + atomic_notifier_call_chain(&atomic_task_notifier_list, + TASK_DELETE, tsk); + security_task_free(tsk); free_uid(tsk->user); put_group_info(tsk->group_info); @@ -1450,6 +1459,8 @@ long do_fork(unsigned long clone_flags, set_tsk_thread_flag(p, TIF_SIGPENDING); } + blocking_notifier_call_chain(&task_notifier_list, TASK_NEW, p); + if (!(clone_flags & CLONE_STOPPED)) wake_up_new_task(p, clone_flags); else
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