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xen-devel
[Xen-devel] Re: [PATCH 13/14] x86/ticketlock: add slowpath logic
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To: |
Jan Beulich <JBeulich@xxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH 13/14] x86/ticketlock: add slowpath logic |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Wed, 17 Nov 2010 01:08:10 -0800 |
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Cc: |
Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xiyou.wangcong@xxxxxxxxx, Eric Dumazet <dada1@xxxxxxxxxxxxx>, Linux Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx> |
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Wed, 17 Nov 2010 01:08:42 -0800 |
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<cover.1289940821.git.jeremy.fitzhardinge@xxxxxxxxxx><cover.1289940821.git.jeremy.fitzhardinge@xxxxxxxxxx> <97ed99ae9160bdb6477284b333bd6708fb7a19cb.1289940821.git.jeremy.fitzhardinge@xxxxxxxxxx> <4CE3A1060200007800022B04@xxxxxxxxxxxxxxxxxx> <4CE397C8.9040901@xxxxxxxx> <4CE398A0.3040105@xxxxxxxx> |
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On 11/17/2010 12:56 AM, Jeremy Fitzhardinge wrote:
> On 11/17/2010 12:52 AM, Jeremy Fitzhardinge wrote:
>> But, yes, %z0 sounds interesting. Is it documented anywhere? I think
>> I've tried to use it in the past and run into gcc bugs.
> This one: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39590
>
> Should be OK in this case because there's no 64-bit values to be seen...
Hm, it fails when __ticket_t is 16 bits:
/home/jeremy/git/linux/arch/x86/include/asm/spinlock.h: Assembler messages:
/home/jeremy/git/linux/arch/x86/include/asm/spinlock.h:73: Error: suffix
or operands invalid for `or'
lock; ors $1, 2(%rbx) #,
So I don't think that's going to work out...
J
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