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Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO hypercall

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO hypercall
Date 2017-09-25 10:40 +0200
Message-ID <utx5M-3Sb-7@gated-at.bofh.it> (permalink)
References (5 earlier) <usv61-5Zz-13@gated-at.bofh.it> <usvpo-65F-17@gated-at.bofh.it> <usvpo-65F-19@gated-at.bofh.it> <usvSq-6uj-13@gated-at.bofh.it> <utrjI-8rW-11@gated-at.bofh.it>
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On Sun, Sep 24, 2017 at 10:52:58PM -0300, Marcelo Tosatti wrote:
> On Fri, Sep 22, 2017 at 02:59:51PM +0200, Peter Zijlstra wrote:

> > Your patch is voodoo programming. You don't solve the actual problem,
> > you try and paper over it.
> 
> Priority boosting on a particular section of code is voodoo programming? 

Yes, because there's nothing that prevents said section of code from
triggering the exact problem you're trying to avoid.

The real fix is making sure the problem cannot happen to begin with,
which is done by fixing the interaction between the VCPU and that
emulation thread thing.

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[patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO hypercall Marcelo Tosatti <mtosatti@redhat.com> - 2017-09-21 13:50 +0200
  Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2017-09-21 15:40 +0200
    Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Peter Zijlstra <peterz@infradead.org> - 2017-09-21 16:10 +0200
      Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Marcelo Tosatti <mtosatti@redhat.com> - 2017-09-22 03:20 +0200
        Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Peter Zijlstra <peterz@infradead.org> - 2017-09-22 12:10 +0200
          Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Peter Zijlstra <peterz@infradead.org> - 2017-09-22 13:00 +0200
            Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Marcelo Tosatti <mtosatti@redhat.com> - 2017-09-22 14:40 +0200
              Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Peter Zijlstra <peterz@infradead.org> - 2017-09-22 15:00 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Paolo Bonzini <pbonzini@redhat.com> - 2017-09-23 13:00 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Peter Zijlstra <peterz@infradead.org> - 2017-09-23 15:50 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Paolo Bonzini <pbonzini@redhat.com> - 2017-09-24 15:10 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Marcelo Tosatti <mtosatti@redhat.com> - 2017-09-25 05:00 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Peter Zijlstra <peterz@infradead.org> - 2017-09-25 11:20 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Paolo Bonzini <pbonzini@redhat.com> - 2017-09-25 17:20 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> - 2017-09-25 18:30 +0200
          Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Marcelo Tosatti <mtosatti@redhat.com> - 2017-09-22 14:20 +0200
            Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Peter Zijlstra <peterz@infradead.org> - 2017-09-22 14:40 +0200
              Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Marcelo Tosatti <mtosatti@redhat.com> - 2017-09-22 14:40 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Peter Zijlstra <peterz@infradead.org> - 2017-09-22 15:10 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Marcelo Tosatti <mtosatti@redhat.com> - 2017-09-25 04:30 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall Peter Zijlstra <peterz@infradead.org> - 2017-09-25 10:40 +0200
              Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall\ Marcelo Tosatti <mtosatti@redhat.com> - 2017-09-22 14:50 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall\ Peter Zijlstra <peterz@infradead.org> - 2017-09-22 15:10 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall\ Marcelo Tosatti <mtosatti@redhat.com> - 2017-09-25 04:30 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall\ Peter Zijlstra <peterz@infradead.org> - 2017-09-25 11:00 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall\ Thomas Gleixner <tglx@linutronix.de> - 2017-09-25 12:50 +0200
                Re: [patch 3/3] x86: kvm guest side support for KVM_HC_RT_PRIO  hypercall\ Jan Kiszka <jan.kiszka@siemens.com> - 2017-09-25 20:40 +0200

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