linux-kernel - Re: [PATCH RFC 2/2] kvm: Be courteous to other VMs in overcommitted scenario in PLE handler

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Message-Id: <20120924224322.f40fba7934383f939e92b78c@gmail.com>
Date:	Mon, 24 Sep 2012 22:43:22 +0900
From:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Cc:	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Ingo Molnar <mingo@...hat.com>, Avi Kivity <avi@...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 2/2] kvm: Be courteous to other VMs in overcommitted
 scenario in PLE handler

On Fri, 21 Sep 2012 23:15:40 +0530
Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com> wrote:

> >> How about doing cond_resched() instead?
> >
> > Actually, an actual call to yield() may be better.
> >
> > That will set scheduler hints to make the scheduler pick
> > another task for one round, while preserving this task's
> > top position in the runqueue.
> 
> I am not a scheduler expert, but I am also inclined towards
> Rik's suggestion here since we set skip buddy here. Takuya?
> 

Yes, I think it's better.
But I hope that experts in Cc will suggest the best way.

Thanks,
	Takuya
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