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    SubjectRe: [PATCH [RT] 10/14] adjust pi_lock usage in wakeup

    On Thu, 21 Feb 2008, Gregory Haskins wrote:

    > From: Peter W.Morreale <pmorreale@novell.com>
    >
    > In wakeup_next_waiter(), we take the pi_lock, and then find out whether
    > we have another waiter to add to the pending owner. We can reduce
    > contention on the pi_lock for the pending owner if we first obtain the
    > pointer to the next waiter outside of the pi_lock.
    >
    > This patch adds a measureable increase in throughput.

    I see how this may decrease contention (slightly less time in holding the
    pi_lock). But, please, when stating something like: "adds a measurable
    increase in throughput", show the benchmark numbers.

    -- Steve



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