linux-kernel - Re: [Xen-devel] [PATCH RFC V8 0/17] Paravirtualized ticket spinlocks

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Message-Id: <4FB2598D0200007800083C55@nat28.tlf.novell.com>
Date:	Tue, 15 May 2012 12:26:37 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Ingo Molnar" <mingo@...nel.org>
Cc:	"Stephan Diestelhorst" <stephan.diestelhorst@....com>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Attilio Rao" <attilio.rao@...rix.com>,
	"Stefano Stabellini" <stefano.stabellini@...citrix.com>,
	"Andi Kleen" <andi@...stfloor.org>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>, "X86" <x86@...nel.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Raghavendra K T" <raghavendra.kt@...ux.vnet.ibm.com>,
	"Srivatsa Vaddagiri" <vatsa@...ux.vnet.ibm.com>,
	"Virtualization" <virtualization@...ts.linux-foundation.org>,
	"Xen Devel" <xen-devel@...ts.xensource.com>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
	"Avi Kivity" <avi@...hat.com>, "Gleb Natapov" <gleb@...hat.com>,
	"Ingo Molnar" <mingo@...hat.com>,
	"Marcelo Tosatti" <mtosatti@...hat.com>,
	"Greg Kroah-Hartman" <gregkh@...e.de>, "KVM" <kvm@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, "LKML" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [Xen-devel] [PATCH RFC V8 0/17] Paravirtualized ticket
 spinlocks

>>> On 07.05.12 at 19:25, Ingo Molnar <mingo@...nel.org> wrote:

(apologies for the late reply, the mail just now made it to my inbox
via xen-devel)

> I'll hold off on the whole thing - frankly, we don't want this 
> kind of Xen-only complexity. If KVM can make use of PLE then Xen 
> ought to be able to do it as well.

It does - for fully virtualized guests. For para-virtualized ones,
it can't (as the hardware feature is an extension to VMX/SVM).

> If both Xen and KVM makes good use of it then that's a different 
> matter.

I saw in a later reply that you're now tending towards trying it
out at least - thanks.

Jan

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