[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH v7 10/11] pvqspinlock, x86: Enable qspinlock PV support for KVM



On 03/20/2014 06:07 PM, Paolo Bonzini wrote:
Il 19/03/2014 21:14, Waiman Long ha scritto:
This patch adds the necessary KVM specific code to allow KVM to support
the sleeping and CPU kicking operations needed by the queue spinlock PV
code.

The remaining problem of this patch is that you cannot get the generically optimal configuration: qspinlock on baremetal, PV qspinlock on KVM/Xen, unfair qspinlock on VMware/Hyper-V. You really need to disable unfair locks in kvm_spinlock_init.

Paolo


So you are suggesting that it is not a good idea to have both unfair lock & PV be enabled together. Right?

In order to disable unfair locks in kvm_spinlock_init(), it has to run after the unfair lock init code. Do you guys know what determine the init function execution sequence?

-Longman

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.