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    SubjectRe: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U8
    Scott Wood wrote:

    >On Thu, Oct 21, 2004 at 06:15:00PM -0400, john cooper wrote:
    >
    >>Yes, but my concern was having to backoff in out-of-sequence
    >>spinlock acquisition paths.
    >>
    >
    >Out-of-sequence acquisition is a bug, unless the caller uses trylocks
    >and handles backoff itself.
    >
    Understood -- we may be getting hung up on terminology here.

    Rather the issue was whether the nondeterministic out-of-sequence
    backoff could be pushed to a noncritical path. I believe so.
    It is further likely a backoff would not be needed as the
    a path acquiring a mutex's task-owned list lock during a
    priority promotion scan shouldn't have reason to acquire any
    task's mutex-owned list lock. The latter list would only need
    to be locked at time of successful mutex acquisition/free.

    -john

    --
    john.cooper@timesys.com

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