[RFC/RFT PATCH v3] sched: automated per tty task groups

[Mike Galbraith]

On Thu, 2010-10-21 at 18:29 +0200, Oleg Nesterov wrote:

> It is not clear to me why do we need rcu_read_lock() and how it can help.
> The tty can go away right after dereferencing signal->tty.

Which was Marcus' crash.  Didn't happen here only because I didn't have
CONFIG_PREEMPT set.

Changes since v2:
  - drop  

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