Re: [PATCH 2/8] kill tracehook_notify_death()

From: Tejun Heo
Date: Thu Jun 23 2011 - 08:23:03 EST

Hello, Oleg.

On Wed, Jun 22, 2011 at 11:08:34PM +0200, Oleg Nesterov wrote:
> Kill tracehook_notify_death(), reimplement the logic in its caller,
> exit_notify().
> This also fixes a minor bug, if the exiting task is the group_leader
> and it is traced by its real_parent, tracehook_notify_death() returns
> task->exit_signal or SIGCHLD depending on thread_group_empty(), this
> looks strange.

Maybe we should do the above in a separate patch?

> - if (tsk->exit_signal != SIGCHLD && !task_detached(tsk) &&
> + if (thread_group_leader(tsk) && tsk->exit_signal != SIGCHLD &&

Hmmm... it probably depends on POV but wouldn't (exit_signal != -1 &&
exit_signal != SIGCHLD) be easier? The logic here is about demoting
specials sigs to SIGCHLD under certain circumstances and the check is
there to prevent promoting -1 to SIGCHLD. I agree the detached() is
more distracting than helping but thread_group_leader() seems
unnecessarily indirect.


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