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    SubjectRe: [PATCH 4/4] sched: add hooks for workqueue
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    On Thu, 2010-05-13 at 12:48 +0200, Tejun Heo wrote:
    > Concurrency managed workqueue needs to know when workers are going to
    > sleep and waking up, and, when a worker goes to sleep, be able to wake
    > up another worker to maintain adequate concurrency. This patch
    > introduces PF_WQ_WORKER to identify workqueue workers and adds the
    > following two hooks.
    >
    > * wq_worker_waking_up(): called when a worker is woken up.
    >
    > * wq_worker_sleeping(): called when a worker is going to sleep and may
    > return a pointer to a local task which should be woken up. The
    > returned task is woken up using try_to_wake_up_local() which is
    > simplified ttwu which is called under rq lock and can only wake up
    > local tasks.

    This changelog seems to lack explanation for why you need the wakeup
    callback.


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