Messages in this thread | | | Date | Fri, 16 Jun 2006 19:26:54 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [RFC][PATCH] avoid cpu hot remove of cpus which have special RT tasks. |
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On 16 Jun 2006 11:14:57 +0200 Andi Kleen <ak@suse.de> wrote:
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> writes: > > > > This is a bit pessimistic. But forecd migration of RT task which is bounded > > to the special cpu will cause unpredictable trouble, I think. > > More trouble than running it on a CPU that is about to fail? > Doubtful. > With my patch, RT tasks will continute to run.
Assume there are some multi-threaded tasks with SCHED_FIFO. If they uses some kind of synchronization in user land and task is migrated to other cpus, it will cause dead-lock.
> It seems like a case of "never check for an error you don't know > how to handle" >
"Dont' migrate a task which may fall in dead-lock if it run on another cpu."
-Kame
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