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    SubjectRe: [patch 1/4] sched: Separate the scheduler entry for preemption
    On Wed, Jun 22, 2011 at 05:52:13PM -0000, Thomas Gleixner wrote:
    > Block-IO and workqueues call into notifier functions from the
    > scheduler core code with interrupts and preemption disabled. These
    > calls should be made before entering the scheduler core.
    > To simplify this, separate the scheduler core code into
    > __schedule(). __schedule() is directly called from the places which
    > set PREEMPT_ACTIVE and from schedule(). This allows us to add the work
    > checks into schedule(), so they are only called when a task voluntary
    > goes to sleep.

    I don't think that works. We'll need to flush the block requests even
    for an involuntary schedule.

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