On Fri, 20 Mar 2020, Peter Zijlstra wrote:
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 ?
Hmm probably as it makes sense for a blocked vcpu not to be contributing to
the loadavg. So if this is the only reason to use interruptible, then yes we
ought to change it.
However, I'll make this a separate patch, given this (ab)use isn't as obvious
as the PS3 case, which is a kthread and therefore signals are masked.
Thanks,
Davidlohr
