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xen-devel
Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks
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To: |
Jan Beulich <JBeulich@xxxxxxxx> |
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Subject: |
Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks |
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From: |
Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> |
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Date: |
Wed, 28 Sep 2011 09:10:54 -0700 |
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Cc: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Stephan Diestelhorst <stephan.diestelhorst@xxxxxxx> |
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Wed, 28 Sep 2011 09:24:45 -0700 |
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On Wed, Sep 28, 2011 at 8:55 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>
>> just use "lock xaddw" there too.
>
> I'm afraid that's not possible, as that might carry from the low 8 bits
> into the upper 8 ones, which must be avoided.
Oh damn, you're right. So I guess the "right" way to do things is with
cmpxchg, but some nasty mfence setup could do it too.
Linus
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- [Xen-devel] [PATCH 08/10] x86/ticketlock: add slowpath logic, (continued)
- [Xen-devel] [PATCH 08/10] x86/ticketlock: add slowpath logic, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 05/10] xen/pvticketlock: Xen implementation for PV ticket locks, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 01/10] x86/ticketlocks: remove obsolete comment, Jeremy Fitzhardinge
- Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks, Stephan Diestelhorst
- Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks, Linus Torvalds
- Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks, Jan Beulich
- Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks,
Linus Torvalds <=
- Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks, Jeremy Fitzhardinge
- Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks, Linus Torvalds
- Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks, H. Peter Anvin
- Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks, Jeremy Fitzhardinge
- Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks, Stephan Diestelhorst
- Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks, Jeremy Fitzhardinge
- Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks, Linus Torvalds
- Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks, Jeremy Fitzhardinge
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