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    SubjectRe: [PATCH RFC 6/9] RCU priority boosting for preemptible RCU
    On Fri, Sep 28, 2007 at 07:05:14PM -0400, Steven Rostedt wrote:
    >
    >
    > --
    > On Fri, 28 Sep 2007, Gautham R Shenoy wrote:
    >
    > > >
    > > > +#ifdef CONFIG_PREEMPT_RCU_BOOST
    > > > +/*
    > > > + * Task state with respect to being RCU-boosted. This state is changed
    > > > + * by the task itself in response to the following three events:
    > > ^^^
    > > > + * 1. Preemption (or block on lock) while in RCU read-side critical section.
    > >
    > > I am wondering, can a task block on a lock while in RCU read-side
    > > critical section?
    >
    > I think this may be specific to the -rt patch. In the -rt patch,
    > spin_locks turn into mutexes, and therefor can block a read-side critical
    > section.

    Yep! I do need to fix the comment.

    > > > + * 2. Outermost rcu_read_unlock() for blocked RCU read-side critical section.
    > > > + *
    > >
    > > Event #3. is missing?
    >
    > I guess Paul needs to answer that one ;-)

    An older version had three, the new one has two, and I forgot to s/three/two/.

    Thanx, Paul
    -
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