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

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Message-ID: <4EEF2382.4010605@redhat.com>
Date:	Mon, 19 Dec 2011 13:44:02 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	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 01:23 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.

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

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