Messages in this thread | | | Date | Wed, 13 Jun 2018 18:19:01 -0700 | From | Ricardo Neri <> | Subject | Re: [RFC PATCH 14/23] watchdog/hardlockup: Decouple the hardlockup detector from perf |
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On Wed, Jun 13, 2018 at 10:43:24AM +0200, Peter Zijlstra wrote: > On Tue, Jun 12, 2018 at 05:57:34PM -0700, Ricardo Neri wrote: > > The current default implementation of the hardlockup detector assumes that > > it is implemented using perf events. > > The sparc and powerpc things are very much not using perf.
Isn't it true that the current hardlockup detector (under kernel/watchdog_hld.c) is based on perf? As far as I understand, this hardlockup detector is constructed using perf events for architectures that don't provide an NMI watchdog. Perhaps I can be more specific and say that this synthetized detector is based on perf.
On a side note, I saw that powerpc might use a perf-based hardlockup detector if it has perf events [1].
Please let me know if my understanding is not correct.
Thanks and BR, Ricardo
[1]. https://elixir.bootlin.com/linux/v4.17/source/arch/powerpc/Kconfig#L218
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