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
