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    SubjectRe: [REPORT] cfs-v4 vs sd-0.44
    On Tue, 24 Apr 2007, Ingo Molnar wrote:

    > * Gene Heskett <gene.heskett@gmail.com> wrote:
    >
    >>> Gene has done some testing under CFS with X reniced to +10 and the
    >>> desktop still worked smoothly for him.
    >>
    >> As a data point here, and probably nothing to do with X, but I did
    >> manage to lock it up, solid, reset button time tonight, by wanting
    >> 'smart' to get done with an update session after amanda had started.
    >> I took both smart processes I could see in htop all the way to -19,
    >> but when it was about done about 3 minutes later, everything came to
    >> an instant, frozen, reset button required lockup. I should have
    >> stopped at -17 I guess. :(
    >
    > yeah, i guess this has little to do with X. I think in your scenario it
    > might have been smarter to either stop, or to renice the workloads that
    > took away CPU power from others to _positive_ nice levels. Negative nice
    > levels can indeed be dangerous.
    >
    > (Btw., to protect against such mishaps in the future i have changed the
    > SysRq-N [SysRq-Nice] implementation in my tree to not only change
    > real-time tasks to SCHED_OTHER, but to also renice negative nice levels
    > back to 0 - this will show up in -v6. That way you'd only have had to
    > hit SysRq-N to get the system out of the wedge.)

    if you are trying to unwedge a system it may be a good idea to renice all tasks
    to 0, it could be that a task at +19 is holding a lock that something else is
    waiting for.

    David Lang
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