killing a kthread

[Rui Paulo]

On Wed, Sep 03, 2008 at 09:34:47AM +0100, kr Lekha wrote:
> Hi,
> i wanted to kill a kthread created by my module, There is no actual
> kthread_kill to kill it
> 
> hence I tried to send kill signal to thread
>  psignal(p, SIGTERM);
> psignal(p, SIGKILL);
> killproc(p,"messeage");
> and kthread_suspend()
> 
> Nothing seems to be killing the kthread, I still see it
> [root@ /usr/src]# ps awx -l | grep kernel
>  UID   PID    PPID CPU PRI NI   VSZ   RSS MWCHAN STAT  TT       TIME COMMAND
>   0     1048     1      0     20   0     0       8      ktsusp      DL
> ??     0:00.01 [new_kernel_thread]
> 
> 
> I have noticed that generally if kernel module wanted to kill a thread then
> it calls
> {
>    wakeup(p);
>    msleep(p,0); /*or tsleep*/
> }
> 
> This puts the thread to sleep forever. However kthread_suspend also performs
> same actions.
> Does scheduler take care to killing it?
> 
> I read that after 2 min scheduler wakes up the thread and
> eventually kills it,
> i see the same kthread suspended even after a day
> 
> I would appreciate any thoughts in this reagard.
> Thanks,

When the thread finishes what it's doing, it should call kthread_exit().

Regards,
-- 
Rui Paulo