Messages in this thread | | | From | Lecopzer Chen <> | Subject | Re: [PATCH v5] arm64: Enable perf events based hard lockup detector | Date | Tue, 30 Mar 2021 16:32:18 +0800 |
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> > Hi Will, Mark, > > > > On Fri, 15 Jan 2021 at 17:32, Sumit Garg <sumit.garg@linaro.org> wrote: > > > > > > With the recent feature added to enable perf events to use pseudo NMIs > > > as interrupts on platforms which support GICv3 or later, its now been > > > possible to enable hard lockup detector (or NMI watchdog) on arm64 > > > platforms. So enable corresponding support. > > > > > > One thing to note here is that normally lockup detector is initialized > > > just after the early initcalls but PMU on arm64 comes up much later as > > > device_initcall(). So we need to re-initialize lockup detection once > > > PMU has been initialized. > > > > > > Signed-off-by: Sumit Garg <sumit.garg@linaro.org> > > > --- > > > > > > Changes in v5: > > > - Fix lockup_detector_init() invocation to be rather invoked from CPU > > > binded context as it makes heavy use of per-cpu variables and shouldn't > > > be invoked from preemptible context. > > > > > > > Do you have any further comments on this? > > > > Lecopzer, > > > > Does this feature work fine for you now? > > This really fixes the warning, I have a real hardware for testing this now. > but do we need to call lockup_detector_init() for each cpu? > > In init/main.c, it's only called by cpu 0 for once.
Oh sorry, I just misread the code, please ignore previous mail.
BRs, Lecopzer
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