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

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Date:	Mon, 5 Aug 2013 11:46:03 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	mingo@...hat.com, x86@...nel.org, tglx@...utronix.de,
	jeremy@...p.org, konrad.wilk@...cle.com, 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


* 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?

Thanks,

	Ingo
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