Re: hardcoded HZ in hub.c

[Andrew Morton]

David Woodhouse wrote:
> 
> [e-mail] said:
> >  Multiple seconds in the worst case.
> 
> Well, I think the PCMCIA socket drivers would be happy with that. Depends
> what akpm also added to the list of tasks,

Nothing which sleeps for very long - mainly serial drivers which queue
a call to tty_hangup(), which immediately queues _another_ tq_scheduler
call to do_tty_hangup (Why?  Heaven knows).

> and whether Linus actually puts
> that patch into test12.

tq_scheduler is a bug.  You can't sleep, you can't call copy_*_user,
you can't call kmalloc non-atomically.  But we do do these things.
Really the only reason for using tq_scheduler is so you can acquire
the tasklist_lock or the files_lock. schedule_task() is fine for that.

tq_scheduler must die.