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- Use the receiver's per-CPU entry in the message, instead of the sender's. (Using the sender's entry wasn't safe for broadcast messages since the same entry ended up on multiple message queues.) - Retry the CAS until it *succeeds* instead of *fails*. This closes a race window, and also ensures a correct return value. The return value is used by the caller to decide whether to broadcast an IPI. This was the main reason smp=on was so slow. We had CPUs busy-waiting until someone else triggered an IPI and moved things along. - Add a CPU pause hint to the spin loop. :^) |
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| .. | ||
| ASM_wrapper.cpp | ||
| CPU.cpp | ||
| Interrupts.cpp | ||
| Processor.cpp | ||
| ProcessorInfo.cpp | ||
| SafeMem.cpp | ||
| TrapFrame.cpp | ||