Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756449Ab2JQJOr (ORCPT ); Wed, 17 Oct 2012 05:14:47 -0400 Received: from mx2.parallels.com ([64.131.90.16]:48156 "EHLO mx2.parallels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753532Ab2JQJOo (ORCPT ); Wed, 17 Oct 2012 05:14:44 -0400 Message-ID: <507EE77D.6010906@parallels.com> Date: Wed, 17 Oct 2012 21:14:37 +0400 From: Glauber Costa User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120911 Thunderbird/15.0.1 MIME-Version: 1.0 To: Michael Wolf CC: , , , , , , Subject: Re: [PATCH RFC V2 0/5] Separate consigned (expected steal) from steal time. References: <20121017022249.16949.2775.stgit@lambeau> In-Reply-To: <20121017022249.16949.2775.stgit@lambeau> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1790 Lines: 39 On 10/17/2012 06:23 AM, Michael Wolf wrote: > 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. To ease the confusion this patch set > adds the idea of consigned (expected steal) time. The host will separate > the consigned time from the steal time. The consignment limit passed to the > host will be the amount of steal time expected within a fixed period of > time. Any other steal time accruing during that period will show as the > traditional steal time. > > TODO: > * Change native_clock to take params and not return a value > * Change update_rq_clock_task > > Changes from V1: > * Removed the steal time allowed percentage from the guest > * Moved the separation of consigned (expected steal) and steal time to the > host. > * No longer include a sysctl interface. > You are showing this in the guest somewhere, but tools like top will still not show it. So for quite a while, it achieves nothing. Of course this is a barrier that any new statistic has to go through. So while annoying, this is per-se ultimately not a blocker. What I still fail to see, is how this is useful information to be shown in the guest. Honestly, if I'm in a guest VM or container, any time during which I am not running is time I lost. It doesn't matter if this was expected or not. This still seems to me as a host-side problem, to be solved entirely by tooling. -- 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/