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    SubjectRe: preempt-timing-2.6.8-rc1
    On Tue, Jul 13, 2004 at 05:28:05AM -0700, William Lee Irwin III wrote:
    > This patch uses the preemption counter increments and decrements to time
    > non-preemptible critical sections.
    >
    > This is an instrumentation patch intended to help determine the causes of
    > scheduling latency related to long non-preemptible critical sections.
    >
    > Changes from 2.6.7-based patch:
    > (1) fix unmap_vmas() check correctly this time
    > (2) add touch_preempt_timing() to cond_resched_lock()
    > (3) depend on preempt until it's worked out wtf goes wrong without it

    You preemption-block hold times will improve *enormously* if you move all
    softirq processing down to the daemon (and possibly raise the daemon to
    one of the higher SCHED_RR priorities, to compensate for softirq processing
    no longer happening at interrupt level).

    Joe
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