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    SubjectRe: [RFC/RFT PATCH v3] sched: automated per tty task groups
    On 11/16, Mike Galbraith wrote:
    > On Tue, 2010-11-16 at 14:04 +0100, Oleg Nesterov wrote:
    > > However, I must admit I dislike this check. Because, looking at this
    > > code, it is not clear why do we check PF_EXITING. It looks as if it
    > > is needed for correctness.
    > Is _not_ needed I presume.
    > I'll remove it, I'm not overly attached (a t t a..;) to it.


    I was wrong, it _is_ needed for correctness. Yes, it is always safe
    to read the pointer, but

    > > Yes, sure, rq->lock should ensure signal->autogroup can't go away.
    > > (even if it can be changed under us). And it does, we are moving all
    > > threads before kref_put().
    > (yeah)

    Exactly. And this means we can _only_ assume it can't go away if
    autogroup_move_group() can see us on ->thread_group list.

    Perhaps this deserve a commen (unless I missed something again).

    Mike, sorry for confusion.


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