On 09/04/2017 10:40 AM, Peter Zijlstra wrote: > On Mon, Sep 04, 2017 at 04:28:36PM +0200, Oscar Salvador wrote: >> This is just a resend of Waiman Long's patch. >> I could not find why it was not merged to upstream, so I thought >> to give it another chance. >> What follows is what Waiman Long wrote. >> >> Xen has an kernel command line argument "xen_nopvspin" to disable >> paravirtual spinlocks. This patch adds a similar "kvm_nopvspin" >> argument to disable paravirtual spinlocks for KVM. This can be useful >> for testing as well as allowing administrators to choose unfair lock >> for their KVM guests if they want to. > For testing its trivial to hack your kernel and I don't feel this is > something an Admin can make reasonable decisions about. I almost forgot about this patch that I sent quite a while ago. I was sending this patch out mainly to maintain consistency between KVM and Xen. This patch is not that important to me, and that is why I didn't push it further. Cheers, Longman
