Yes. The semaphore and spinlock "deadlock" detectors that depend on
timeouts or on a maximum number of spinlock iterations are definitely not
acceptable on any kind of production machine.
> But the NMI patch has a performance-downside too: the timer irq will be
> driven from the 8259 and not from the apic chip (the io-apic will instead
> run an NMI irq for the same hardware-event), and that means all timer irq
> handlers will be run on the first CPU and so the kernel will scale worse
> (the other CPU may be idle at the same time).
>
> So if you want it into the stock kernel I am fine with it, but I believe
> it's not a good idea to make it a default thing.
Good point. Never mind.
Linus
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