Re: [PATCH RFC v3 2/4] exec: introduce struct task_exec_state

[Oleg Nesterov <oleg@redhat.com>]

On 05/20, Christian Brauner (Amutable) wrote:
>
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -962,6 +962,8 @@ struct task_struct {
>  	struct mm_struct		*mm;
>  	struct mm_struct		*active_mm;
>
> +	struct task_exec_state __rcu	*exec_state;

Sorry if this was already discussed...

Can't we (later) move exec_state into signal_struct?

AFAICS, the only complication is that task_still_dumpable/etc can't use
tsk->signal->exec_state if tsk was alredy reaped (another thread can do
exec_mmap() after that). But perhaps we can rely on pid_alive() check
and return an error if the task has already passed __unhash_process() ?

Oleg.