This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] performance counters

To: Jan Beulich <jbeulich@xxxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] performance counters
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Fri, 16 Mar 2007 08:21:33 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Fri, 16 Mar 2007 01:19:54 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <45FA60BA.76E4.0078.0@xxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcdnpBsUWW9WZtOXEduq+wAWy6hiGQ==
Thread-topic: [Xen-devel] performance counters
User-agent: Microsoft-Entourage/

On 16/3/07 08:17, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

>> It has the added benefit of avoiding cacheline bouncing.
>> It just needs someone to implement this improvement. ;-)
> I'll take care of this, but it may take me a few days to get to it. But I
> also think there's no need for rush here.

Indeed. The counters aren't even compiled by default. It may be, however,
that per-cpu non-atomic counters are cheap enough to enable all the time.
We'll have to see.

 -- Keir

Xen-devel mailing list