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    SubjectRe: [patch 2.6.16-mm2 10/9] sched throttle tree extract - kill interactive task feedback loop
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    Greetings,

    The patch below stops interactive tasks from feeding off each other
    during round-robin.

    With this 10th patch in place, a busy server with _default_ throttle
    settings (ie tunables may now be mostly unneeded) looks like this:

    [root]:# w
    18:38:00 up 23 min, 2 users, load average: 10.07, 9.94, 7.50
    USER TTY LOGIN@ IDLE JCPU PCPU WHAT
    root tty1 18:15 22:12 30.89s 30.84s top d1
    root pts/0 18:20 0.00s 0.07s 0.00s w
    [root]:# time netstat|grep :81|wc -l
    1758

    real 0m0.304s
    user 0m0.144s
    sys 0m0.135s
    [root]:# time netstat|grep :81|wc -l
    1776

    real 0m0.306s
    user 0m0.118s
    sys 0m0.163s
    [root]:# time netstat|grep :81|wc -l
    1799

    real 0m0.493s
    user 0m0.146s
    sys 0m0.141s
    [root]:#

    My desktop still feels just peachy.

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

    --- linux-2.6.16-mm2/kernel/sched.c-9.export_tunables 2006-03-31 13:37:09.000000000 +0200
    +++ linux-2.6.16-mm2/kernel/sched.c 2006-04-05 19:22:01.000000000 +0200
    @@ -3480,7 +3480,7 @@ go_idle:
    queue = array->queue + idx;
    next = list_entry(queue->next, task_t, run_list);

    - if (!rt_task(next) && interactive_sleep(next->sleep_type)) {
    + if (!TASK_INTERACTIVE(next) && interactive_sleep(next->sleep_type)) {
    unsigned long long delta = now - next->timestamp;
    if (unlikely((long long)(now - next->timestamp) < 0))
    delta = 0;

    -
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