linux-kernel - Re: [PATCH RFC 0/2] kvm: Improving directed yield in PLE handler

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Message-ID: <4FFE86A4.2010809@redhat.com>
Date:	Thu, 12 Jul 2012 11:11:16 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
CC:	Christian Borntraeger <borntraeger@...ibm.com>,
	"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>,
	S390 <linux-s390@...r.kernel.org>,
	Carsten Otte <cotte@...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>,
	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>,
	Alexander Graf <agraf@...e.de>,
	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH RFC 0/2] kvm: Improving directed yield in PLE handler

On 07/12/2012 08:11 AM, Raghavendra K T wrote:
>> Ah, I thouht you objected to the CONFIG var.  Maybe call it
>> cpu_relax_intercepted since that's the linuxy name for the instruction.
>>
> 
> Ok, just to be on same page. 'll have :
> 1. cpu_relax_intercepted instead of  pause_loop_exited.
> 
> 2. CONFIG_KVM_HAVE_CPU_RELAX_INTERCEPT which is unconditionally
> selected for x86 and s390
> 
> 3. make request mechanism to clear cpu_relax_intercepted.
> 
> ('ll do same thing for s390 also but have not seen s390 code using
> request mechanism, so not sure if it ok.. otherwise we have to clear
> unconditionally for s390 before guest enter and for x86 we have to move
> make_request back to vmx/svm).
> will post V3 with these changes.

You can leave the s390 changes to the s390 people; just make sure the
generic code is ready.

-- 
error compiling committee.c: too many arguments to function


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