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    Subject[2.6.16-mm1 patch] ignore timewarps
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    Greetings,

    The patch below is a correction to patch 1 of my throttling tree series.

    The only thing that really matters is that timewarps are ignored,
    whatever the cause. This patch does that, and only that.

    -Mike

    Signed-off-by: Mike Galbraith <efault@gmx.de>

    --- linux-2.6.16-mm1/kernel/sched.c.org 2006-03-23 15:01:41.000000000 +0100
    +++ linux-2.6.16-mm1/kernel/sched.c 2006-03-23 15:02:25.000000000 +0100
    @@ -805,6 +805,15 @@
    unsigned long long __sleep_time = now - p->timestamp;
    unsigned long sleep_time;

    + /*
    + * On SMP systems, a task can go to sleep on one CPU
    + * and wake up on another. When this happens, now can
    + * end up being less than p->timestamp for short sleeps.
    + * Ignore these, they're insignificant.
    + */
    + if (unlikely(now < p->timestamp))
    + __sleep_time = 0;
    +
    if (batch_task(p))
    sleep_time = 0;
    else {

    -
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