From mboxrd@z Thu Jan 1 00:00:00 1970 From: Glauber Costa Subject: Re: [PATCH RFC 0/3] Add guest cpu_entitlement reporting Date: Fri, 24 Aug 2012 08:53:28 +0400 Message-ID: <503708C8.2090401@parallels.com> References: <20120823231346.11681.1502.stgit@lambeau> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: , , , , , To: Michael Wolf Return-path: In-Reply-To: <20120823231346.11681.1502.stgit@lambeau> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On 08/24/2012 03:14 AM, Michael Wolf wrote: > This is an RFC regarding the reporting of stealtime. In the case of > where you have a system that is running with partial processors such as > KVM 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 a sysctl interface to set the > cpu entitlement. This is the percentage of cpu that the guest system is > expected to receive. As long as the steal time is within its expected > range it will show up as 0 in /proc/stat. The user will then see in the > accounting tools that they are getting a full utilization of the cpu > resources assigned to them. > And how is such a knob not confusing? Steal time is pretty well defined in meaning and is shown in top for ages. I really don't see the point for this.