linux-kernel - Re: [PATCH RFC 1/2] kvm: Handle undercommitted guest case in PLE handler

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Message-ID: <50604691.90904@linux.vnet.ibm.com>
Date:	Mon, 24 Sep 2012 17:10:01 +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>
Subject: Re: [PATCH RFC 1/2] kvm: Handle undercommitted guest case in PLE
 handler

On 09/24/2012 05:03 PM, Peter Zijlstra wrote:
> On Fri, 2012-09-21 at 17:30 +0530, Raghavendra K T wrote:
>> +unsigned long rq_nr_running(void)
>> +{
>> +       return this_rq()->nr_running;
>> +}
>> +EXPORT_SYMBOL(rq_nr_running);
>
> Uhm,.. no, that's a horrible thing to export.
>

True.. I had the same fear :).  Other options I thought were something
like  nr_running()/num_online_cpus, this_cpu_load(), etc..

Could you please let me know, if we can rely some good metric to say,
system is not overcommitted/overcommitted?


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