Messages in this thread | | | Date | Tue, 15 Jan 2013 01:25:40 +0100 | Subject | Re: [PATCH v2] hardlockup: detect hard lockups without NMIs using secondary cpus | From | Frederic Weisbecker <> |
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2013/1/15 Colin Cross <ccross@android.com>: > On Mon, Jan 14, 2013 at 4:13 PM, Frederic Weisbecker <fweisbec@gmail.com> wrote: >> I believe this is pretty much what the RCU stall detector does >> already: checks for other CPUs being responsive. The only difference >> is on how it checks that. For RCU it's about checking for CPUs >> reporting quiescent states when requested to do so. In your case it's >> about ensuring the hrtimer interrupt is well handled. >> >> One thing you can do is to enqueue an RCU callback (cal_rcu()) every >> minute so you can force other CPUs to report quiescent states >> periodically and thus check for lockups. > > That's a good point, I'll take a look at using that. A minute is too > long, some SoCs have maximum HW watchdog periods of under 30 seconds, > but a call_rcu every 10-20 seconds might be sufficient.
Sure. And you can tune CONFIG_RCU_CPU_STALL_TIMEOUT accordingly.
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