linux-kernel - Re: [PATCH RFC V11 15/18] kvm : Paravirtual ticketlocks support for linux guests running on KVM hypervisor

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Message-ID: <20130805153734.GJ3321@phenom.dumpdata.com>
Date:	Mon, 5 Aug 2013 11:37:34 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Gleb Natapov <gleb@...hat.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	mingo@...hat.com, x86@...nel.org, tglx@...utronix.de,
	jeremy@...p.org, hpa@...or.com, pbonzini@...hat.com,
	linux-doc@...r.kernel.org, habanero@...ux.vnet.ibm.com,
	xen-devel@...ts.xensource.com, peterz@...radead.org,
	mtosatti@...hat.com, stefano.stabellini@...citrix.com,
	andi@...stfloor.org, attilio.rao@...rix.com, ouyang@...pitt.edu,
	gregkh@...e.de, agraf@...e.de, chegu_vinod@...com,
	torvalds@...ux-foundation.org, avi.kivity@...il.com,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, riel@...hat.com,
	drjones@...hat.com, virtualization@...ts.linux-foundation.org,
	srivatsa.vaddagiri@...il.com
Subject: Re: [PATCH RFC V11 15/18] kvm : Paravirtual ticketlocks support for
 linux guests running on KVM hypervisor

On Mon, Aug 05, 2013 at 11:46:03AM +0200, Ingo Molnar wrote:
> 
> * Gleb Natapov <gleb@...hat.com> wrote:
> 
> > On Fri, Aug 02, 2013 at 11:25:39AM +0200, Ingo Molnar wrote:
> > > > Ingo,
> > > > 
> > > > Do you have any concerns reg this series? please let me know if this 
> > > > looks good now to you.
> > > 
> > > I'm inclined to NAK it for excessive quotation - who knows how many 
> > > people left the discussion in disgust? Was it done to drive away as 
> > > many reviewers as possible?
> > > 
> > > Anyway, see my other reply, the measurement results seem hard to 
> > > interpret and inconclusive at the moment.
> >
> > That result was only for patch 18 of the series, not pvspinlock in 
> > general.
> 
> Okay - I've re-read the performance numbers and they are impressive, so no 
> objections from me.
> 
> The x86 impact seems to be a straightforward API change, with most of the 
> changes on the virtualization side. So:
> 
> Acked-by: Ingo Molnar <mingo@...nel.org>
> 
> I guess you'd want to carry this in the KVM tree or so - maybe in a 
> separate branch because it changes Xen as well?

May I suggest an alternate way - perhaps you can put them in a tip/spinlock
tree for v3.12 - since both KVM and Xen maintainers have acked and carefully
reviewed them?
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