Messages in this thread | | | Date | Mon, 6 Mar 2000 21:05:23 -0300 | From | Ralf Baechle <> | Subject | Re: Linux kernerl preemptive ?? |
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On Mon, Mar 06, 2000 at 11:29:47AM +0200, Tuukka Toivonen wrote:
> I have once read his papers and followed discussion here, but I'm not > really qualified to answer. However, I'll do my best... > > The main idea seems to be to duplicate the kernel data structures in > memory. For example, 32-way SMP system might have 8 copies of kernel data, > each running as 4-way SMP system. This means that the kernel copy A > accessing its own data structures locks only its own data -- kernel copies > B, C, ... are not locked and can run at full speed.
Indeed, but the most common SMP systems do just broadcast the invalidates, so your 4-way kernel #1 will still bother #2. It won't save you with directory caches either because there the invalidates are directed only to the CPU that actually has the CPU.
Ralf
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