Re: [PATCH] Instrumenting high latency

From: William Lee Irwin III (wli_at_holomorphy.com)
Date: 07/12/04

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    Date:	Mon, 12 Jul 2004 03:44:42 -0700
To: Rajput <rajput@indo.net>

    On Mon, Jul 12, 2004 at 04:11:32PM +0530, Rajput wrote:
    > what is the difference in interrupt latency with and without your patch.
    > Regards,
    > Rajput.

    This is meant to instrument scheduling latency, it doesn't improve
    anything directly. It likely introduces a fair amount of overhead.
    In the event a poor preempt_thresh= parameter is chosen, it may render
    systems effectively unusable due to endless printk()'ing (which I should
    fix via printk_ratelimit() shortly).

    I recommend applying and/or enabling this only for diagnostic purposes.

    -- wli
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  • Next message: Lenar Lõhmus: "Re: Voluntary Preemption + concurent games"