Messages in this thread | | | Subject | Re: [patchlet] sched: fix rt throttle runtime borrowing | From | Mike Galbraith <> | Date | Mon, 07 Mar 2011 10:33:34 +0100 |
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On Mon, 2011-03-07 at 17:11 +0800, Yong Zhang wrote: > On Mon, Mar 7, 2011 at 4:21 PM, Mike Galbraith <efault@gmx.de> wrote: > > Greetings, > > > > The RT throttle leaves a bit to be desired as a protection mechanism. > > With default settings, the thing won't save your bacon if you start a > > single hog as RT on SMP box, or if your normally sane app goes nuts. > > > > With the below, my box will limp along so I can kill the RT hog. May > > not be the best solution, but works for me.. modulo bustage I haven't > > noticed yet of course. > > > > sched: fix rt throttle runtime borrowing > > > > If allowed to borrow up to rt_period, the throttle has no effect on an out > > of control RT task, allowing it to consume 100% CPU indefinitely, blocking > > system critical SCHED_NORMAL threads indefinitely. > > Yep. > I think it's helpful.
Well, it does prevent complete death, but you have to be pretty darn attentive to notice that the patient is still technically alive ;-)
As such, turning borrowing off by default, and making borrowing up to within a micron of 100% CPU an opt-in feature likely makes more sense.
-Mike
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