Messages in this thread | | | Date | Tue, 10 Nov 2020 14:03:48 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 0/2] arm64: Allow the rescheduling IPI to bypass irq_enter/exit |
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On Mon, Nov 02, 2020 at 10:30:50AM +0000, Valentin Schneider wrote:
> Now, I'd like to pen exactly why we think it's okay to forgo irq_{enter, > exit}() for that one IRQ and not any other.
Thomas already said a few words on this, but basically scheduler_ipi() is a NOP (*almost*), the IPI has no body. All it does is tickle the return-from-interrupt path. So any setup and tear-down done for the non-existing body is a waste of time.
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