Messages in this thread | | | Subject | Re: Stop machine threads are getting preemted by the rt period enforcement | From | Peter Zijlstra <> | Date | Wed, 04 Jun 2008 20:55:25 +0200 |
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On Wed, 2008-06-04 at 11:24 -0700, Max Krasnyansky wrote: > > Peter Zijlstra wrote: > > On Wed, 2008-06-04 at 11:07 -0700, Max Krasnyansky wrote: > >> Peter, Ingo, > >> > >> Take a look at the report below (came up during isolcpu= remove discussions). > >> > >> It looks like stop_machine threads are getting forcefully preempted because > >> they exceed their RT quanta. It's strange because rt period is pretty long. > >> But given that disabling rt period logic solves the issue the machine was not > >> really stuck. > > > > Yeah, I know, I'm already looking at this > > I see. Does it look like a bug in the rt period logic ? > Or did the stop_machine thread really run for a long time (in the report that > you got that is) ?
looks like a fun race between refreshing the period and updating cpu_online_map.
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