Re: Calling current() from interrupt context

From: Alan Cox (
Date: Mon Oct 09 2000 - 17:52:56 EST

> > I dont actually know a CPU that doesnt have one in SMP mode. Its just often
> > behind an I/O interface that is slower than ideal
> Where would you put it for IA32 ? I don't know any free MSR that could
> be abused for that, and acessing MSRs is insanely slow anyways. Any
> other ideas ?

The CPU identifier is in the APIC in SMP IA32. 2.0 reads it off the APIC each
time. Its a few cycles so the 2.2 approach is nicer

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