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

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Date:	Tue, 30 Oct 2012 09:14:18 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
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 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.


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