Messages in this thread | | | Date | Wed, 22 Nov 2023 12:51:19 -0800 (PST) | From | Christoph Lameter <> | Subject | Re: [PATCH 7/7] cpuidle/poll_state: replace cpu_relax with smp_cond_load_relaxed |
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On Mon, 20 Nov 2023, Mihai Carabas wrote:
> cpu_relax on ARM64 does a simple "yield". Thus we replace it with > smp_cond_load_relaxed which basically does a "wfe".
Well it clears events first (which requires the first WFE) and then does a WFE waiting for any events if no events were pending.
WFE does not cause a VMEXIT? Or does the inner loop of smp_cond_load_relaxed now do 2x VMEXITS?
KVM ARM64 code seems to indicate that WFE causes a VMEXIT. See kvm_handle_wfx().
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