Messages in this thread | | | Date | Tue, 13 Mar 2012 09:42:24 -0400 | From | Don Zickus <> | Subject | Re: [PATCH] watchdog: make sure the watchdog thread gets CPU on loaded system |
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On Tue, Mar 13, 2012 at 10:45:22AM +0100, Michal Hocko wrote: > If the system is loaded while hotplugging a CPU we might end up with a bogus > hardlockup detection. This has been seen during LTP pounder test executed > in parallel with hotplug test. > > The main problem is that enable_watchdog (called when CPU is brought up) > registers perf event which periodically checks per-cpu counter > (hrtimer_interrupts), updated from a hrtimer callback, but the hrtimer is fired > from the kernel thread.
Seems reasonable to me. I'll apply it.
Thanks, Don
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