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xen-devel
[Xen-devel] Re: [PATCH RFC V5 00/11] Paravirtualized ticketlocks
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To: |
Jason Baron <jbaron@xxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [PATCH RFC V5 00/11] Paravirtualized ticketlocks |
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From: |
"H. Peter Anvin" <hpa@xxxxxxxxx> |
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Date: |
Fri, 14 Oct 2011 11:38:30 -0700 |
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Cc: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, konrad.wilk@xxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, rth@xxxxxxxxxx, 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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Fri, 14 Oct 2011 11:40:21 -0700 |
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<cover.1318466916.git.jeremy.fitzhardinge@xxxxxxxxxx> <1318503245.24856.12.camel@twins> <4E971580.6030300@xxxxxxxx> <20111014141701.GA2433@xxxxxxxxxx> <4E986B2B.60803@xxxxxxxx> <20111014183539.GE2433@xxxxxxxxxx> |
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On 10/14/2011 11:35 AM, Jason Baron wrote:
>
> A nice featuer of jump labels, is that it allows the various branches
> (currently we only support 2), to be written in c code (as opposed to asm),
> which means you can write your code as you normally would and access any
> parameters as you normally would - hopefully, making the code pretty
> readable as well.
>
> I hope this better clarifies the use-cases for the various mechanisms.
>
There is an important subcase which might be handy which would be to
allow direct patching of call instructions instead of using indirect calls.
-hpa
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