[PATCH 0/4] signal_struct->count must die, initial changes
From: Oleg Nesterov
Date: Wed Mar 17 2010 - 15:30:23 EST
signal_struct->count in its current form must die.
- it has no reasons to be atomic_t
- it looks like a reference counter, but it is not
- otoh, we really need to make task->signal refcountable,
just look at the extremely ugly task_rq_unlock_wait()
called from __exit_signals().
- we should change the lifetime rules for task->signal,
it should be pinned to task_struct. We have a lot of
code which can be simplified after that.
- it is not needed! while the code is correct, any usage
of this counter is artificial, except fs/proc uses it
correctly to show the number of threads.
This series removes the usage of sig->count from exit pathes.
Oleg.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/