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

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Message-ID: <4EEF2729.6080501@redhat.com>
Date:	Mon, 19 Dec 2011 13:59:37 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Nikunj A Dadhania <nikunj@...ux.vnet.ibm.com>
CC:	Ingo Molnar <mingo@...e.hu>, 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 12/19/2011 01:50 PM, Nikunj A Dadhania wrote:
> 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?

No, hard PLE, see the calls to yield_to.

-- 
error compiling committee.c: too many arguments to function

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