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CONFIG_MIPS_MT_SMTC_INSTANT_REPLAY: Low-latency Dispatch of Deferred SMTC IPIs

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The Linux kernel configuration item CONFIG_MIPS_MT_SMTC_INSTANT_REPLAY:

Help text

SMTC pseudo-interrupts between TCs are deferred and queued if the target TC is interrupt-inhibited (IXMT). In the first SMTC prototypes, these queued IPIs were serviced on return to user mode, or on entry into the kernel idle loop. The INSTANT_REPLAY option dispatches them as part of local_irq_restore() processing, which adds runtime overhead (hence the option to turn it off), but ensures that IPIs are handled promptly even under heavy I/O interrupt load.



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