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Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV spinlock

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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.

So why? In general less knobs is better.

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[PATCH resend] x86,kvm: Add a kernel parameter to disable PV spinlock Oscar Salvador <osalvador@suse.de> - 2017-09-04 16:40 +0200
  Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Peter Zijlstra <peterz@infradead.org> - 2017-09-04 16:50 +0200
    Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Waiman Long <longman@redhat.com> - 2017-09-04 21:40 +0200
    Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Davidlohr Bueso <dave@stgolabs.net> - 2017-09-05 00:30 +0200
      Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Juergen Gross <jgross@suse.com> - 2017-09-05 08:30 +0200
        Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Peter Zijlstra <peterz@infradead.org> - 2017-09-05 09:00 +0200
          Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Juergen Gross <jgross@suse.com> - 2017-09-05 09:40 +0200
            Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Juergen Gross <jgross@suse.com> - 2017-09-05 10:20 +0200
              Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Peter Zijlstra <peterz@infradead.org> - 2017-09-05 10:30 +0200
                Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Juergen Gross <jgross@suse.com> - 2017-09-05 11:00 +0200
                Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Peter Zijlstra <peterz@infradead.org> - 2017-09-05 11:10 +0200
                Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Juergen Gross <jgross@suse.com> - 2017-09-05 11:20 +0200
            Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Peter Zijlstra <peterz@infradead.org> - 2017-09-05 10:20 +0200
        Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Oscar Salvador <osalvador@suse.de> - 2017-09-05 09:00 +0200
          Re: [PATCH resend] x86,kvm: Add a kernel parameter to disable PV  spinlock Peter Zijlstra <peterz@infradead.org> - 2017-09-05 10:10 +0200

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