linux-kernel - Re: [PATCH V2 RFC 3/3] kvm: Check system load and handle different commit cases accordingly

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Message-ID: <5090C0DD.4070505@linux.vnet.ibm.com>
Date:	Wed, 31 Oct 2012 11:40:37 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	"H. Peter Anvin" <hpa@...or.com>, Avi Kivity <avi@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Srikar <srikar@...ux.vnet.ibm.com>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	KVM <kvm@...r.kernel.org>, Jiannan Ouyang <ouyang@...pitt.edu>,
	Chegu Vinod <chegu_vinod@...com>,
	"Andrew M. Theurer" <habanero@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>,
	Gleb Natapov <gleb@...hat.com>,
	Andrew Jones <drjones@...hat.com>
Subject: Re: [PATCH V2 RFC 3/3] kvm: Check system load and handle different
 commit cases accordingly

On 10/30/2012 01:44 PM, Peter Zijlstra wrote:
> On Tue, 2012-10-30 at 11:27 +0530, Raghavendra K T wrote:
>> Okay, now IIUC, usage of *any* global measure is bad?
>
> Yep, people like to carve up their machines, esp. now that they're
> somewhat bigger than they used to be. This can result in very asymmetric
> loads, no global measure can ever deal with that.

Thanks for explaining the concerns. Very True and if load is very 
asymmetric due to power optimization etc constraints. This may affect.


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