Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755527Ab3CFNUj (ORCPT ); Wed, 6 Mar 2013 08:20:39 -0500 Received: from mail-la0-f53.google.com ([209.85.215.53]:37999 "EHLO mail-la0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754611Ab3CFNUi (ORCPT ); Wed, 6 Mar 2013 08:20:38 -0500 MIME-Version: 1.0 In-Reply-To: <20130219011104.GA5785@amt.cnet> References: <20130205214818.4615.12937.stgit@lambeau> <20130219011104.GA5785@amt.cnet> Date: Wed, 6 Mar 2013 14:20:36 +0100 Message-ID: Subject: Re: [PATCH 0/4] Alter steal-time reporting in the guest From: Frederic Weisbecker To: Marcelo Tosatti Cc: Michael Wolf , linux-kernel@vger.kernel.org, riel@redhat.com, gleb@redhat.com, kvm@vger.kernel.org, peterz@infradead.org, glommer@parallels.com, mingo@redhat.com, anthony@codemonkey.ws Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1316 Lines: 29 2013/2/19 Marcelo Tosatti : > On Mon, Feb 18, 2013 at 05:43:47PM +0100, Frederic Weisbecker wrote: >> 2013/2/5 Michael Wolf : >> > In the case of where you have a system that is running in a >> > capped or overcommitted environment the user may see steal time >> > being reported in accounting tools such as top or vmstat. This can >> > cause confusion for the end user. >> >> Sorry, I'm no expert in this area. But I don't really understand what >> is confusing for the end user here. > > I suppose that what is wanted is to subtract stolen time due to 'known > reasons' from steal time reporting. 'Known reasons' being, for example, > hard caps. So a vcpu executing instructions with no halt, but limited to > 80% of available bandwidth, would not have 20% of stolen time reported. Ok, that's a good explanation to add to make that subtle steal time issue clearer. > > But yes, a description of the scenario that is being dealt with, with > details, is important. Yeah especially for such a significant user ABI change. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/