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Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function
Date 2017-09-06 09:10 +0200
Message-ID <umCDg-6wl-15@gated-at.bofh.it> (permalink)
References (1 earlier) <umm5t-38R-29@gated-at.bofh.it> <ummRQ-3Lb-21@gated-at.bofh.it> <ummRQ-3Lb-23@gated-at.bofh.it> <umn1w-3OU-15@gated-at.bofh.it> <umnbc-3SD-9@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Guys, please trim email.

On Tue, Sep 05, 2017 at 10:31:46AM -0400, Waiman Long wrote:
> For clarification, I was actually asking if you consider just adding one
> more jump label to skip it for Xen/KVM instead of making
> virt_spin_lock() a pv-op.

I don't understand. What performance are you worried about. Native will
now do: "xor rax,rax; jnz some_cold_label" that's fairly trival code.

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Thread

[PATCH 0/4] make virt_spin_lock() a pvops function Juergen Gross <jgross@suse.com> - 2017-09-05 15:30 +0200
  [PATCH 3/4] paravirt: add virt_spin_lock pvops function Juergen Gross <jgross@suse.com> - 2017-09-05 15:30 +0200
    Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Peter Zijlstra <peterz@infradead.org> - 2017-09-05 16:00 +0200
      Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Juergen Gross <jgross@suse.com> - 2017-09-05 16:10 +0200
    Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Waiman Long <longman@redhat.com> - 2017-09-05 16:10 +0200
      Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Peter Zijlstra <peterz@infradead.org> - 2017-09-05 16:10 +0200
        Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Waiman Long <longman@redhat.com> - 2017-09-05 16:20 +0200
    Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Waiman Long <longman@redhat.com> - 2017-09-05 16:20 +0200
      Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Juergen Gross <jgross@suse.com> - 2017-09-05 16:20 +0200
        Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Waiman Long <longman@redhat.com> - 2017-09-05 16:30 +0200
          Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Waiman Long <longman@redhat.com> - 2017-09-05 16:40 +0200
            Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Juergen Gross <jgross@suse.com> - 2017-09-05 16:50 +0200
            Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Peter Zijlstra <peterz@infradead.org> - 2017-09-06 09:10 +0200
              Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Waiman Long <longman@redhat.com> - 2017-09-06 14:50 +0200
                Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Peter Zijlstra <peterz@infradead.org> - 2017-09-06 15:10 +0200
                Re: [PATCH 3/4] paravirt: add virt_spin_lock pvops function Waiman Long <longman@redhat.com> - 2017-09-06 15:20 +0200

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