linux-kernel - Re: [PATCH RFC V5 00/11] Paravirtualized ticketlocks

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Message-ID: <4E9884C2.3090803@goop.org>
Date:	Fri, 14 Oct 2011 11:51:46 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Jason Baron <jbaron@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...nel.dk>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM <kvm@...r.kernel.org>, Andi Kleen <andi@...stfloor.org>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	konrad.wilk@...cle.com, rth@...hat.com
Subject: Re: [PATCH RFC V5 00/11] Paravirtualized ticketlocks

On 10/14/2011 11:38 AM, H. Peter Anvin wrote:
> 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.

Right, that's how the pvops patching is primarily used.

    J
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