Re: [PATCH 18/15] kvm: Replace vcpu->swait with rcuwait

Peter Zijlstra
2020-03-20T12:55:49Z

On Fri, Mar 20, 2020 at 01:55:26AM -0700, Davidlohr Bueso wrote:
> - swait_event_interruptible_exclusive(*wq, ((!vcpu->arch.power_off) &&
> - (!vcpu->arch.pause)));
> + rcuwait_wait_event(*wait,
> + (!vcpu->arch.power_off) && (!vcpu->arch.pause),
> + TASK_INTERRUPTIBLE);

> - for (;;) {
> - prepare_to_swait_exclusive(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
> -
> - if (kvm_vcpu_check_block(vcpu) < 0)
> - break;
> -
> - waited = true;
> - schedule();
> - }
> -
> - finish_swait(&vcpu->wq, &wait);
> + rcuwait_wait_event(&vcpu->wait,
> + (block_check = kvm_vcpu_check_block(vcpu)) < 0,
> + TASK_INTERRUPTIBLE);

Are these yet more instances that really want to be TASK_IDLE ?