Messages in this thread | | | Date | Mon, 19 Jan 2004 23:30:32 -0800 | From | Tim Hockin <> | Subject | Re: CPU Hotplug: Hotplug Script And SIGPWR |
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On Tue, Jan 20, 2004 at 06:11:49PM +1100, Nick Piggin wrote: > I thought hotplug is allowed to fail? Thus you can have a hung system. > Or what if the hotplug script itself becomes TASK_UNRUNNABLE? What if the > process needs a guaranteed scheduling latency?
I guess a hotplug script MAY fail. I don't think it's a good idea to make your CPU hotplug script fail. May and Misght are different. It's up to the implementor whether the script can get into a failure condition.
The hotplug script can only become unrunnable if you yank out all the CPUs on the system. I'd assume it would have an affinity of 0xffffffff.
What if <which> process needs guaranteed scheduling latency? Do we really _guarantee_ scheduling latency *anywhere*?
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