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[Xen-devel] Re: [PATCH RFC V5 00/11] Paravirtualized ticketlocks

To: "H. Peter Anvin" <hpa@xxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH RFC V5 00/11] Paravirtualized ticketlocks
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Fri, 14 Oct 2011 12:10:33 -0700
Cc: Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, konrad.wilk@xxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Jason Baron <jbaron@xxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 10/14/2011 11:37 AM, H. Peter Anvin wrote:
> On 10/14/2011 10:02 AM, Jeremy Fitzhardinge wrote:
>> Jump labels are essentially binary: you can use path A or path B.  pvops
>> are multiway: there's no limit to the number of potential number of
>> paravirtualized hypervisor implementations.  At the moment we have 4:
>> native, Xen, KVM and lguest.
>>
> This isn't (or shouldn't be) really true... it should be possible to do
> an N-way jump label even if the current mechanism doesn't.

We probably don't want all those implementations (near) inline, so they
would end up being plain function calls anyway.

    J

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