linux-kernel - Re: [PATCH RFC V4 2/3] kvm: Note down when cpu relax intercepted or pause loop exited

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Message-ID: <500522F4.7090601@linux.vnet.ibm.com>
Date:	Tue, 17 Jul 2012 14:01:48 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Avi Kivity <avi@...hat.com>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Ingo Molnar <mingo@...hat.com>, Rik van Riel <riel@...hat.com>,
	Srikar <srikar@...ux.vnet.ibm.com>,
	S390 <linux-s390@...r.kernel.org>,
	Carsten Otte <cotte@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	KVM <kvm@...r.kernel.org>, chegu vinod <chegu_vinod@...com>,
	"Andrew M. Theurer" <habanero@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>, X86 <x86@...nel.org>,
	Gleb Natapov <gleb@...hat.com>, linux390@...ibm.com,
	Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>,
	Joerg Roedel <joerg.roedel@....com>
Subject: Re: [PATCH RFC V4 2/3] kvm: Note down when cpu relax intercepted
 or pause loop exited

On 07/17/2012 01:52 PM, Avi Kivity wrote:
> On 07/16/2012 08:24 PM, Raghavendra K T wrote:
>> So are you saying allow vcpu to spin in non over-commit scenarios? So
>> that we avoid all yield_to etc...
>>
>> ( Or even in some other place where it is useful).
>
> When is yielding useful, if you're not overcommitted?
>

Right. There is no need to do yield_to when run queue has only one task.

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