From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1755329Ab3BFOgj (ORCPT <rfc822;w@1wt.eu>);
	Wed, 6 Feb 2013 09:36:39 -0500
Received: from mx2.parallels.com ([64.131.90.16]:40069 "EHLO mx2.parallels.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1752075Ab3BFOgf (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Wed, 6 Feb 2013 09:36:35 -0500
Message-ID: <51126A84.5050005@parallels.com>
Date: Wed, 6 Feb 2013 18:36:52 +0400
From: Glauber Costa <glommer@parallels.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2
MIME-Version: 1.0
To: Michael Wolf <mjw@linux.vnet.ibm.com>
CC: <linux-kernel@vger.kernel.org>, <riel@redhat.com>, <gleb@redhat.com>,
        <kvm@vger.kernel.org>, <peterz@infradead.org>, <mtosatti@redhat.com>,
        <mingo@redhat.com>, <anthony@codemonkey.ws>
Subject: Re: [PATCH 4/4] Add a timer to allow the separation of consigned
 from steal time.
References: <20130205214818.4615.12937.stgit@lambeau> <20130205214941.4615.29852.stgit@lambeau>
In-Reply-To: <20130205214941.4615.29852.stgit@lambeau>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 02/06/2013 01:49 AM, Michael Wolf wrote:
> Add a helper routine to scheduler/core.c to allow the kvm module
> to retrieve the cpu hardlimit settings.  The values will be used
> to set up a timer that is used to separate the consigned from the
> steal time.

Sorry: What is the business of a timer in here?
Whenever we read steal time, we know how much time has passed and with
that information we can know the entitlement for the period. This breaks
if we suspend, but we know that we suspended, so this is not a problem.

Everything bigger the entitlement is steal time.