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    SubjectRe: preempt-timing-2.6.8-rc1
    William Lee Irwin III wrote:
    > 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
    > On Tue, Jul 13, 2004 at 10:36:00AM -0400, Joe Korty wrote:
    >>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).
    > Plausible. Got a patch?


    I don't think you should make ksoftirq a realtime task, because that
    defeats the purpose of having it to prevent livelocking userspace
    doesn't it?

    However, you may want to increase it from nice +19. Probably just to
    nice 0 would be an idea.
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