From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chao Peng <chao.p.peng@linux.intel.com>
Subject: Re: [PATCH 0/4] enable Memory Bandwidth Monitoring
 (MBM) for VMs
Date: Wed, 24 Dec 2014 16:35:33 +0800
Message-ID: <20141224083532.GB10595@pengc-linux.bj.intel.com>
References: <1419324880-13212-1-git-send-email-chao.p.peng@linux.intel.com>
	<54998E97.5070608@citrix.com>
Reply-To: Chao Peng <chao.p.peng@linux.intel.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
Content-Disposition: inline
In-Reply-To: <54998E97.5070608@citrix.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: keir@xen.org, Ian.Campbell@citrix.com, stefano.stabellini@eu.citrix.com, Ian.Jackson@eu.citrix.com, xen-devel@lists.xen.org, JBeulich@suse.com, wei.liu2@citrix.com
List-Id: xen-devel@lists.xenproject.org

On Tue, Dec 23, 2014 at 03:47:35PM +0000, Andrew Cooper wrote:
> On 23/12/2014 08:54, Chao Peng wrote:
> >Intel Memory Bandwidth Monitoring(MBM) is a new hardware feature
> >which builds on the CMT infrastructure to allow monitoring of system
> >memory bandwidth. Event codes are provided to monitor both "total"
> >and "local" bandwidth, meaning bandwidth over QPI and other external
> >links can be monitored.
> >
> >For XEN, MBM is used to monitor memory bandwidth for VMs. Due to its
> >dependency on CMT, the software also makes use of most of CMT codes.
> >Actually, besides introducing two additional events and some cpuid
> >feature bits, there are no extra changes compared to cache occupancy
> >monitoring in CMT. Due to this, CMT should be enabled first to use
> >this feature.
> >
> >For interface changes, the patch serial only introduces a new command
> >"XEN_SYSCTL_PSR_CMT_get_l3_event_mask" which exposes MBM feature
> >capability to user space and introduces two additional options for
> >"xl psr-cmt-show":
> >total_mem_bandwidth:     Show total memory bandwidth
> >local_mem_bandwidth:     Show local memory bandwidth
> >
> >The usage flow keeps the same with CMT.
> >
> >Chao Peng (4):
> >   x86: expose CMT L3 event mask to user space
> >   tools: libxc: add routine to get CMT L3 event mask
> >   tools: libxl: code preparation for MBM
> >   tools: add total/local memory bandwith monitoring
> 
> Please can you add a note about MBM in the command line documentation,
> beside the CMT information.
Sure.
Chao
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel