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    SubjectRe: [patch] idle_task was wasting a lot of CPU

    On Fri, 27 Nov 1998, Linus Torvalds wrote:

    > Hmm.. The idle tasks _should_ have a negative counter value all the time,
    > at least they used to. That's the proper fix, to make sure that the
    > counter value is never positive in the first place.
    >
    > I wonder when that broke?

    oops, i think those came in by accident with the SMP idle-reschedule stuff
    in 2.1.111.

    on the bright side, 2.1.131 should be a killer ;)

    this is the 2.1.111 breakage:

    --- v2.1.110/linux/arch/i386/kernel/process.c Tue Jul 21 00:15:30 1998
    +++ linux/arch/i386/kernel/process.c Wed Jul 22 14:45:23 1998
    @@ -115,8 +115,8 @@
    if (current->pid != 0)
    goto out;
    /* endless idle loop with no priority at all */
    - current->priority = -100;
    - current->counter = -100;
    + current->priority = 0;
    + current->counter = 0;
    for (;;) {
    [...etc...]

    -- mingo

    -
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