From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.fraser@eu.citrix.com>
Subject: Re: Re: [PATCH] CPUIDLE: shorten hpet spin_lock holding
	time
Date: Thu, 22 Apr 2010 09:23:06 +0100
Message-ID: <C7F5C5FA.1213B%keir.fraser@eu.citrix.com>
References: <C7F5C537.12125%keir.fraser@eu.citrix.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: <C7F5C537.12125%keir.fraser@eu.citrix.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: "Wei, Gang" <gang.wei@intel.com>, "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
List-Id: xen-devel@lists.xenproject.org

On 22/04/2010 09:19, "Keir Fraser" <keir.fraser@eu.citrix.com> wrote:

>> Hm, let me see if I can come up with a patch for this and post it for you.
> 
> How about the attached patch? It MWAITs on a completely new flag field,
> avoiding the IPI-avoidance semantics of softirq_pending. It also folds in
> your patch. It also does wakeup-waiting checks on timer_deadline_start, that
> being the field that initiates wakeup via the MONITORed memory region.

...If you do think it looks okay, could you also test it out on relevant
hardware? :-)

 Thanks,
 Keir