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    SubjectRe: allow non root users to set io priority "idle" ?
    On Wed, Aug 08, 2007 at 01:51:32PM +0400, Sheplyakov Alexei wrote:
    > On Mon, Aug 06, 2007 at 01:11:01PM +0200, Andi Kleen wrote:
    > > Very low priority can starve others when it holds some kernel resource
    > > needed by another task.
    > Nevertheless ordinary users are permitted to lower priority ([re]nice)

    Low priority as allowed by renice is ok -- the resource holder will
    run eventually and the system make progress.

    > I don't quite understand. There are a lot of other ways to starve such
    > high-priority process:
    > 1. renice the low-priority process

    That requires user action.

    e.g. if you google a bit you can find a famous story where the NASA
    had to do that remotely to solve a PI problem on one of the Mars rovers. But I'm
    sure they weren't very pleased about it. And not everybody has a JPL
    control room to patch things up in the backhand.

    > 2. send it a signal
    > 3. ptrace it

    Only root can do these.


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