An over-committed guest with more vCPUs than pCPUs has a heavy overload in
osq_lock().
This is because vCPU A hold the osq lock and yield out, vCPU B wait per_cpu
node->locked to be set. IOW, vCPU B wait vCPU A to run and unlock the osq
lock.
Kernel has an interface bool vcpu_is_preempted(int cpu
On Fri, 28 Oct 2016, Pan Xinhui wrote:
/*
* If we need to reschedule bail... so we can block.
+* Use vcpu_is_preempted to detech lock holder preemption issue
^^ detect
+ * and break.
Could you please
在 2016/10/30 00:52, Davidlohr Bueso 写道:
On Fri, 28 Oct 2016, Pan Xinhui wrote:
/*
* If we need to reschedule bail... so we can block.
+ * Use vcpu_is_preempted to detech lock holder preemption issue
^^ detect
ok. thanks for
