From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mukesh Rathor <mukesh.rathor@oracle.com>
Subject: Re: Linux spin lock enhancement on xen
Date: Wed, 25 Aug 2010 19:13:50 -0700
Message-ID: <20100825191350.4b065e96@mantra.us.oracle.com>
References: <4C6C0C3D.2070508@goop.org>
	<C891D252.1E4BD%keir.fraser@eu.citrix.com>
	<AANLkTin_HTtxL9wB9JcxDWFeGGYHKHfBxGW4dPrYKDGb@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <AANLkTin_HTtxL9wB9JcxDWFeGGYHKHfBxGW4dPrYKDGb@mail.gmail.com>
List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: George Dunlap <dunlapg@umich.edu>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>, "Xen-devel@lists.xensource.com" <Xen-devel@lists.xensource.com>, Keir Fraser <keir.fraser@eu.citrix.com>
List-Id: xen-devel@lists.xenproject.org


>  I think an impleentation of "yield_to" that might make sense in the
> credit scheduler is:
> * Put the yielding vcpu behind one cpu
> * If the yield-to vcpu is not running, pull it to the front within its
> priority.  (I.e., if it's UNDER, put it at the front so it runs next;
> if it's OVER, make it the first OVER cpu.)
> 

Yup, I second it.

thanks,
Mukesh