Messages in this thread | | | Date | Fri, 22 Jun 2018 11:22:09 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [RFC PATCH 00/16] x86/split_lock: Enable #AC exception for split locked accesses |
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On Thu, 21 Jun 2018, Fenghua Yu wrote: > The control knobs allow sysadmin to handle #AC for split lock in different > scenarios and usages. > > The control knob for kernel is to choose re-executing the faulting > instruction (default) or kernel panic. Kernel panic may be useful in hard > real time which has less tolerant to bad performance.
That's nonsense, really.
1) The re-executing mechanism is broken and totally useless
2) Panicing a real-time system just due to a single #AC is total overkill. Real-Time systems care very much about proper safe state transitioning. Panic is surely a safe state, but so is power off. But neither of them qualifies as proper state transitioning.
Thanks,
tglx
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