linux-kernel - Re: [RFC PATCH 0/4] Gang scheduling in CFS

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Message-ID: <87hb0wbx0p.fsf@abhimanyu.in.ibm.com>
Date:	Mon, 19 Dec 2011 17:20:46 +0530
From:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
To:	Avi Kivity <avi@...hat.com>, Ingo Molnar <mingo@...e.hu>
Cc:	peterz@...radead.org, linux-kernel@...r.kernel.org,
	vatsa@...ux.vnet.ibm.com, bharata@...ux.vnet.ibm.com
Subject: Re: [RFC PATCH 0/4] Gang scheduling in CFS

On Mon, 19 Dec 2011 13:44:02 +0200, Avi Kivity <avi@...hat.com> wrote:
> On 12/19/2011 01:23 PM, Ingo Molnar wrote:
> > What's behind this huge speedup? Does ebizzy use user-space 
> > spinlocks perhaps? Could we do something on the user-space side 
> > to get a similar speedup?
> 
> kvm tries to detect spinlocks (by trapping repeated executions of PAUSE)
> and yield to a related vcpu.  It's far from perfect however, and relies
> on the spinlock code using PAUSE.
> 
Avi, is this soft-PLE kind of thing?

Regards
Nikunj

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